wt-status: make the require_clean_work_tree() function reusable

[git] / wt-status.c

#include "cache.h"
#include "wt-status.h"
#include "object.h"
#include "dir.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "diffcore.h"
#include "quote.h"
#include "run-command.h"
#include "argv-array.h"
#include "remote.h"
#include "refs.h"
#include "submodule.h"
#include "column.h"
#include "strbuf.h"
#include "utf8.h"
#include "worktree.h"
#include "lockfile.h"

static const char cut_line[] =
"------------------------ >8 ------------------------\n";

static char default_wt_status_colors[][COLOR_MAXLEN] = {
        GIT_COLOR_NORMAL, /* WT_STATUS_HEADER */
        GIT_COLOR_GREEN,  /* WT_STATUS_UPDATED */
        GIT_COLOR_RED,    /* WT_STATUS_CHANGED */
        GIT_COLOR_RED,    /* WT_STATUS_UNTRACKED */
        GIT_COLOR_RED,    /* WT_STATUS_NOBRANCH */
        GIT_COLOR_RED,    /* WT_STATUS_UNMERGED */
        GIT_COLOR_GREEN,  /* WT_STATUS_LOCAL_BRANCH */
        GIT_COLOR_RED,    /* WT_STATUS_REMOTE_BRANCH */
        GIT_COLOR_NIL,    /* WT_STATUS_ONBRANCH */
};

static const char *color(int slot, struct wt_status *s)
{
        const char *c = "";
        if (want_color(s->use_color))
                c = s->color_palette[slot];
        if (slot == WT_STATUS_ONBRANCH && color_is_nil(c))
                c = s->color_palette[WT_STATUS_HEADER];
        return c;
}

static void status_vprintf(struct wt_status *s, int at_bol, const char *color,
                const char *fmt, va_list ap, const char *trail)
{
        struct strbuf sb = STRBUF_INIT;
        struct strbuf linebuf = STRBUF_INIT;
        const char *line, *eol;

        strbuf_vaddf(&sb, fmt, ap);
        if (!sb.len) {
                if (s->display_comment_prefix) {
                        strbuf_addch(&sb, comment_line_char);
                        if (!trail)
                                strbuf_addch(&sb, ' ');
                }
                color_print_strbuf(s->fp, color, &sb);
                if (trail)
                        fprintf(s->fp, "%s", trail);
                strbuf_release(&sb);
                return;
        }
        for (line = sb.buf; *line; line = eol + 1) {
                eol = strchr(line, '\n');

                strbuf_reset(&linebuf);
                if (at_bol && s->display_comment_prefix) {
                        strbuf_addch(&linebuf, comment_line_char);
                        if (*line != '\n' && *line != '\t')
                                strbuf_addch(&linebuf, ' ');
                }
                if (eol)
                        strbuf_add(&linebuf, line, eol - line);
                else
                        strbuf_addstr(&linebuf, line);
                color_print_strbuf(s->fp, color, &linebuf);
                if (eol)
                        fprintf(s->fp, "\n");
                else
                        break;
                at_bol = 1;
        }
        if (trail)
                fprintf(s->fp, "%s", trail);
        strbuf_release(&linebuf);
        strbuf_release(&sb);
}

void status_printf_ln(struct wt_status *s, const char *color,
                        const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        status_vprintf(s, 1, color, fmt, ap, "\n");
        va_end(ap);
}

void status_printf(struct wt_status *s, const char *color,
                        const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        status_vprintf(s, 1, color, fmt, ap, NULL);
        va_end(ap);
}

static void status_printf_more(struct wt_status *s, const char *color,
                               const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        status_vprintf(s, 0, color, fmt, ap, NULL);
        va_end(ap);
}

void wt_status_prepare(struct wt_status *s)
{
        unsigned char sha1[20];

        memset(s, 0, sizeof(*s));
        memcpy(s->color_palette, default_wt_status_colors,
               sizeof(default_wt_status_colors));
        s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
        s->use_color = -1;
        s->relative_paths = 1;
        s->branch = resolve_refdup("HEAD", 0, sha1, NULL);
        s->reference = "HEAD";
        s->fp = stdout;
        s->index_file = get_index_file();
        s->change.strdup_strings = 1;
        s->untracked.strdup_strings = 1;
        s->ignored.strdup_strings = 1;
        s->show_branch = -1;  /* unspecified */
        s->display_comment_prefix = 0;
}

static void wt_longstatus_print_unmerged_header(struct wt_status *s)
{
        int i;
        int del_mod_conflict = 0;
        int both_deleted = 0;
        int not_deleted = 0;
        const char *c = color(WT_STATUS_HEADER, s);

        status_printf_ln(s, c, _("Unmerged paths:"));

        for (i = 0; i < s->change.nr; i++) {
                struct string_list_item *it = &(s->change.items[i]);
                struct wt_status_change_data *d = it->util;

                switch (d->stagemask) {
                case 0:
                        break;
                case 1:
                        both_deleted = 1;
                        break;
                case 3:
                case 5:
                        del_mod_conflict = 1;
                        break;
                default:
                        not_deleted = 1;
                        break;
                }
        }

        if (!s->hints)
                return;
        if (s->whence != FROM_COMMIT)
                ;
        else if (!s->is_initial)
                status_printf_ln(s, c, _("  (use \"git reset %s <file>...\" to unstage)"), s->reference);
        else
                status_printf_ln(s, c, _("  (use \"git rm --cached <file>...\" to unstage)"));

        if (!both_deleted) {
                if (!del_mod_conflict)
                        status_printf_ln(s, c, _("  (use \"git add <file>...\" to mark resolution)"));
                else
                        status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as appropriate to mark resolution)"));
        } else if (!del_mod_conflict && !not_deleted) {
                status_printf_ln(s, c, _("  (use \"git rm <file>...\" to mark resolution)"));
        } else {
                status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as appropriate to mark resolution)"));
        }
        status_printf_ln(s, c, "%s", "");
}

static void wt_longstatus_print_cached_header(struct wt_status *s)
{
        const char *c = color(WT_STATUS_HEADER, s);

        status_printf_ln(s, c, _("Changes to be committed:"));
        if (!s->hints)
                return;
        if (s->whence != FROM_COMMIT)
                ; /* NEEDSWORK: use "git reset --unresolve"??? */
        else if (!s->is_initial)
                status_printf_ln(s, c, _("  (use \"git reset %s <file>...\" to unstage)"), s->reference);
        else
                status_printf_ln(s, c, _("  (use \"git rm --cached <file>...\" to unstage)"));
        status_printf_ln(s, c, "%s", "");
}

static void wt_longstatus_print_dirty_header(struct wt_status *s,
                                             int has_deleted,
                                             int has_dirty_submodules)
{
        const char *c = color(WT_STATUS_HEADER, s);

        status_printf_ln(s, c, _("Changes not staged for commit:"));
        if (!s->hints)
                return;
        if (!has_deleted)
                status_printf_ln(s, c, _("  (use \"git add <file>...\" to update what will be committed)"));
        else
                status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" to update what will be committed)"));
        status_printf_ln(s, c, _("  (use \"git checkout -- <file>...\" to discard changes in working directory)"));
        if (has_dirty_submodules)
                status_printf_ln(s, c, _("  (commit or discard the untracked or modified content in submodules)"));
        status_printf_ln(s, c, "%s", "");
}

static void wt_longstatus_print_other_header(struct wt_status *s,
                                             const char *what,
                                             const char *how)
{
        const char *c = color(WT_STATUS_HEADER, s);
        status_printf_ln(s, c, "%s:", what);
        if (!s->hints)
                return;
        status_printf_ln(s, c, _("  (use \"git %s <file>...\" to include in what will be committed)"), how);
        status_printf_ln(s, c, "%s", "");
}

static void wt_longstatus_print_trailer(struct wt_status *s)
{
        status_printf_ln(s, color(WT_STATUS_HEADER, s), "%s", "");
}

#define quote_path quote_path_relative

static const char *wt_status_unmerged_status_string(int stagemask)
{
        switch (stagemask) {
        case 1:
                return _("both deleted:");
        case 2:
                return _("added by us:");
        case 3:
                return _("deleted by them:");
        case 4:
                return _("added by them:");
        case 5:
                return _("deleted by us:");
        case 6:
                return _("both added:");
        case 7:
                return _("both modified:");
        default:
                die("BUG: unhandled unmerged status %x", stagemask);
        }
}

static const char *wt_status_diff_status_string(int status)
{
        switch (status) {
        case DIFF_STATUS_ADDED:
                return _("new file:");
        case DIFF_STATUS_COPIED:
                return _("copied:");
        case DIFF_STATUS_DELETED:
                return _("deleted:");
        case DIFF_STATUS_MODIFIED:
                return _("modified:");
        case DIFF_STATUS_RENAMED:
                return _("renamed:");
        case DIFF_STATUS_TYPE_CHANGED:
                return _("typechange:");
        case DIFF_STATUS_UNKNOWN:
                return _("unknown:");
        case DIFF_STATUS_UNMERGED:
                return _("unmerged:");
        default:
                return NULL;
        }
}

static int maxwidth(const char *(*label)(int), int minval, int maxval)
{
        int result = 0, i;

        for (i = minval; i <= maxval; i++) {
                const char *s = label(i);
                int len = s ? utf8_strwidth(s) : 0;
                if (len > result)
                        result = len;
        }
        return result;
}

static void wt_longstatus_print_unmerged_data(struct wt_status *s,
                                              struct string_list_item *it)
{
        const char *c = color(WT_STATUS_UNMERGED, s);
        struct wt_status_change_data *d = it->util;
        struct strbuf onebuf = STRBUF_INIT;
        static char *padding;
        static int label_width;
        const char *one, *how;
        int len;

        if (!padding) {
                label_width = maxwidth(wt_status_unmerged_status_string, 1, 7);
                label_width += strlen(" ");
                padding = xmallocz(label_width);
                memset(padding, ' ', label_width);
        }

        one = quote_path(it->string, s->prefix, &onebuf);
        status_printf(s, color(WT_STATUS_HEADER, s), "\t");

        how = wt_status_unmerged_status_string(d->stagemask);
        len = label_width - utf8_strwidth(how);
        status_printf_more(s, c, "%s%.*s%s\n", how, len, padding, one);
        strbuf_release(&onebuf);
}

static void wt_longstatus_print_change_data(struct wt_status *s,
                                            int change_type,
                                            struct string_list_item *it)
{
        struct wt_status_change_data *d = it->util;
        const char *c = color(change_type, s);
        int status;
        char *one_name;
        char *two_name;
        const char *one, *two;
        struct strbuf onebuf = STRBUF_INIT, twobuf = STRBUF_INIT;
        struct strbuf extra = STRBUF_INIT;
        static char *padding;
        static int label_width;
        const char *what;
        int len;

        if (!padding) {
                /* If DIFF_STATUS_* uses outside the range [A..Z], we're in trouble */
                label_width = maxwidth(wt_status_diff_status_string, 'A', 'Z');
                label_width += strlen(" ");
                padding = xmallocz(label_width);
                memset(padding, ' ', label_width);
        }

        one_name = two_name = it->string;
        switch (change_type) {
        case WT_STATUS_UPDATED:
                status = d->index_status;
                if (d->head_path)
                        one_name = d->head_path;
                break;
        case WT_STATUS_CHANGED:
                if (d->new_submodule_commits || d->dirty_submodule) {
                        strbuf_addstr(&extra, " (");
                        if (d->new_submodule_commits)
                                strbuf_addf(&extra, _("new commits, "));
                        if (d->dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
                                strbuf_addf(&extra, _("modified content, "));
                        if (d->dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
                                strbuf_addf(&extra, _("untracked content, "));
                        strbuf_setlen(&extra, extra.len - 2);
                        strbuf_addch(&extra, ')');
                }
                status = d->worktree_status;
                break;
        default:
                die("BUG: unhandled change_type %d in wt_longstatus_print_change_data",
                    change_type);
        }

        one = quote_path(one_name, s->prefix, &onebuf);
        two = quote_path(two_name, s->prefix, &twobuf);

        status_printf(s, color(WT_STATUS_HEADER, s), "\t");
        what = wt_status_diff_status_string(status);
        if (!what)
                die("BUG: unhandled diff status %c", status);
        len = label_width - utf8_strwidth(what);
        assert(len >= 0);
        if (status == DIFF_STATUS_COPIED || status == DIFF_STATUS_RENAMED)
                status_printf_more(s, c, "%s%.*s%s -> %s",
                                   what, len, padding, one, two);
        else
                status_printf_more(s, c, "%s%.*s%s",
                                   what, len, padding, one);
        if (extra.len) {
                status_printf_more(s, color(WT_STATUS_HEADER, s), "%s", extra.buf);
                strbuf_release(&extra);
        }
        status_printf_more(s, GIT_COLOR_NORMAL, "\n");
        strbuf_release(&onebuf);
        strbuf_release(&twobuf);
}

static void wt_status_collect_changed_cb(struct diff_queue_struct *q,
                                         struct diff_options *options,
                                         void *data)
{
        struct wt_status *s = data;
        int i;

        if (!q->nr)
                return;
        s->workdir_dirty = 1;
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p;
                struct string_list_item *it;
                struct wt_status_change_data *d;

                p = q->queue[i];
                it = string_list_insert(&s->change, p->one->path);
                d = it->util;
                if (!d) {
                        d = xcalloc(1, sizeof(*d));
                        it->util = d;
                }
                if (!d->worktree_status)
                        d->worktree_status = p->status;
                d->dirty_submodule = p->two->dirty_submodule;
                if (S_ISGITLINK(p->two->mode))
                        d->new_submodule_commits = !!oidcmp(&p->one->oid,
                                                            &p->two->oid);

                switch (p->status) {
                case DIFF_STATUS_ADDED:
                        die("BUG: worktree status add???");
                        break;

                case DIFF_STATUS_DELETED:
                        d->mode_index = p->one->mode;
                        oidcpy(&d->oid_index, &p->one->oid);
                        /* mode_worktree is zero for a delete. */
                        break;

                case DIFF_STATUS_MODIFIED:
                case DIFF_STATUS_TYPE_CHANGED:
                case DIFF_STATUS_UNMERGED:
                        d->mode_index = p->one->mode;
                        d->mode_worktree = p->two->mode;
                        oidcpy(&d->oid_index, &p->one->oid);
                        break;

                case DIFF_STATUS_UNKNOWN:
                        die("BUG: worktree status unknown???");
                        break;
                }

        }
}

static int unmerged_mask(const char *path)
{
        int pos, mask;
        const struct cache_entry *ce;

        pos = cache_name_pos(path, strlen(path));
        if (0 <= pos)
                return 0;

        mask = 0;
        pos = -pos-1;
        while (pos < active_nr) {
                ce = active_cache[pos++];
                if (strcmp(ce->name, path) || !ce_stage(ce))
                        break;
                mask |= (1 << (ce_stage(ce) - 1));
        }
        return mask;
}

static void wt_status_collect_updated_cb(struct diff_queue_struct *q,
                                         struct diff_options *options,
                                         void *data)
{
        struct wt_status *s = data;
        int i;

        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p;
                struct string_list_item *it;
                struct wt_status_change_data *d;

                p = q->queue[i];
                it = string_list_insert(&s->change, p->two->path);
                d = it->util;
                if (!d) {
                        d = xcalloc(1, sizeof(*d));
                        it->util = d;
                }
                if (!d->index_status)
                        d->index_status = p->status;
                switch (p->status) {
                case DIFF_STATUS_ADDED:
                        /* Leave {mode,oid}_head zero for an add. */
                        d->mode_index = p->two->mode;
                        oidcpy(&d->oid_index, &p->two->oid);
                        break;
                case DIFF_STATUS_DELETED:
                        d->mode_head = p->one->mode;
                        oidcpy(&d->oid_head, &p->one->oid);
                        /* Leave {mode,oid}_index zero for a delete. */
                        break;

                case DIFF_STATUS_COPIED:
                case DIFF_STATUS_RENAMED:
                        d->head_path = xstrdup(p->one->path);
                        d->score = p->score * 100 / MAX_SCORE;
                        /* fallthru */
                case DIFF_STATUS_MODIFIED:
                case DIFF_STATUS_TYPE_CHANGED:
                        d->mode_head = p->one->mode;
                        d->mode_index = p->two->mode;
                        oidcpy(&d->oid_head, &p->one->oid);
                        oidcpy(&d->oid_index, &p->two->oid);
                        break;
                case DIFF_STATUS_UNMERGED:
                        d->stagemask = unmerged_mask(p->two->path);
                        /*
                         * Don't bother setting {mode,oid}_{head,index} since the print
                         * code will output the stage values directly and not use the
                         * values in these fields.
                         */
                        break;
                }
        }
}

static void wt_status_collect_changes_worktree(struct wt_status *s)
{
        struct rev_info rev;

        init_revisions(&rev, NULL);
        setup_revisions(0, NULL, &rev, NULL);
        rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
        DIFF_OPT_SET(&rev.diffopt, DIRTY_SUBMODULES);
        if (!s->show_untracked_files)
                DIFF_OPT_SET(&rev.diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
        if (s->ignore_submodule_arg) {
                DIFF_OPT_SET(&rev.diffopt, OVERRIDE_SUBMODULE_CONFIG);
                handle_ignore_submodules_arg(&rev.diffopt, s->ignore_submodule_arg);
        }
        rev.diffopt.format_callback = wt_status_collect_changed_cb;
        rev.diffopt.format_callback_data = s;
        copy_pathspec(&rev.prune_data, &s->pathspec);
        run_diff_files(&rev, 0);
}

static void wt_status_collect_changes_index(struct wt_status *s)
{
        struct rev_info rev;
        struct setup_revision_opt opt;

        init_revisions(&rev, NULL);
        memset(&opt, 0, sizeof(opt));
        opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
        setup_revisions(0, NULL, &rev, &opt);

        DIFF_OPT_SET(&rev.diffopt, OVERRIDE_SUBMODULE_CONFIG);
        if (s->ignore_submodule_arg) {
                handle_ignore_submodules_arg(&rev.diffopt, s->ignore_submodule_arg);
        } else {
                /*
                 * Unless the user did explicitly request a submodule ignore
                 * mode by passing a command line option we do not ignore any
                 * changed submodule SHA-1s when comparing index and HEAD, no
                 * matter what is configured. Otherwise the user won't be
                 * shown any submodules she manually added (and which are
                 * staged to be committed), which would be really confusing.
                 */
                handle_ignore_submodules_arg(&rev.diffopt, "dirty");
        }

        rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
        rev.diffopt.format_callback = wt_status_collect_updated_cb;
        rev.diffopt.format_callback_data = s;
        rev.diffopt.detect_rename = 1;
        rev.diffopt.rename_limit = 200;
        rev.diffopt.break_opt = 0;
        copy_pathspec(&rev.prune_data, &s->pathspec);
        run_diff_index(&rev, 1);
}

static void wt_status_collect_changes_initial(struct wt_status *s)
{
        int i;

        for (i = 0; i < active_nr; i++) {
                struct string_list_item *it;
                struct wt_status_change_data *d;
                const struct cache_entry *ce = active_cache[i];

                if (!ce_path_match(ce, &s->pathspec, NULL))
                        continue;
                it = string_list_insert(&s->change, ce->name);
                d = it->util;
                if (!d) {
                        d = xcalloc(1, sizeof(*d));
                        it->util = d;
                }
                if (ce_stage(ce)) {
                        d->index_status = DIFF_STATUS_UNMERGED;
                        d->stagemask |= (1 << (ce_stage(ce) - 1));
                        /*
                         * Don't bother setting {mode,oid}_{head,index} since the print
                         * code will output the stage values directly and not use the
                         * values in these fields.
                         */
                } else {
                        d->index_status = DIFF_STATUS_ADDED;
                        /* Leave {mode,oid}_head zero for adds. */
                        d->mode_index = ce->ce_mode;
                        hashcpy(d->oid_index.hash, ce->sha1);
                }
        }
}

static void wt_status_collect_untracked(struct wt_status *s)
{
        int i;
        struct dir_struct dir;
        uint64_t t_begin = getnanotime();

        if (!s->show_untracked_files)
                return;

        memset(&dir, 0, sizeof(dir));
        if (s->show_untracked_files != SHOW_ALL_UNTRACKED_FILES)
                dir.flags |=
                        DIR_SHOW_OTHER_DIRECTORIES | DIR_HIDE_EMPTY_DIRECTORIES;
        if (s->show_ignored_files)
                dir.flags |= DIR_SHOW_IGNORED_TOO;
        else
                dir.untracked = the_index.untracked;
        setup_standard_excludes(&dir);

        fill_directory(&dir, &s->pathspec);

        for (i = 0; i < dir.nr; i++) {
                struct dir_entry *ent = dir.entries[i];
                if (cache_name_is_other(ent->name, ent->len) &&
                    dir_path_match(ent, &s->pathspec, 0, NULL))
                        string_list_insert(&s->untracked, ent->name);
                free(ent);
        }

        for (i = 0; i < dir.ignored_nr; i++) {
                struct dir_entry *ent = dir.ignored[i];
                if (cache_name_is_other(ent->name, ent->len) &&
                    dir_path_match(ent, &s->pathspec, 0, NULL))
                        string_list_insert(&s->ignored, ent->name);
                free(ent);
        }

        free(dir.entries);
        free(dir.ignored);
        clear_directory(&dir);

        if (advice_status_u_option)
                s->untracked_in_ms = (getnanotime() - t_begin) / 1000000;
}

void wt_status_collect(struct wt_status *s)
{
        wt_status_collect_changes_worktree(s);

        if (s->is_initial)
                wt_status_collect_changes_initial(s);
        else
                wt_status_collect_changes_index(s);
        wt_status_collect_untracked(s);
}

static void wt_longstatus_print_unmerged(struct wt_status *s)
{
        int shown_header = 0;
        int i;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;
                it = &(s->change.items[i]);
                d = it->util;
                if (!d->stagemask)
                        continue;
                if (!shown_header) {
                        wt_longstatus_print_unmerged_header(s);
                        shown_header = 1;
                }
                wt_longstatus_print_unmerged_data(s, it);
        }
        if (shown_header)
                wt_longstatus_print_trailer(s);

}

static void wt_longstatus_print_updated(struct wt_status *s)
{
        int shown_header = 0;
        int i;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;
                it = &(s->change.items[i]);
                d = it->util;
                if (!d->index_status ||
                    d->index_status == DIFF_STATUS_UNMERGED)
                        continue;
                if (!shown_header) {
                        wt_longstatus_print_cached_header(s);
                        s->commitable = 1;
                        shown_header = 1;
                }
                wt_longstatus_print_change_data(s, WT_STATUS_UPDATED, it);
        }
        if (shown_header)
                wt_longstatus_print_trailer(s);
}

/*
 * -1 : has delete
 *  0 : no change
 *  1 : some change but no delete
 */
static int wt_status_check_worktree_changes(struct wt_status *s,
                                             int *dirty_submodules)
{
        int i;
        int changes = 0;

        *dirty_submodules = 0;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                d = s->change.items[i].util;
                if (!d->worktree_status ||
                    d->worktree_status == DIFF_STATUS_UNMERGED)
                        continue;
                if (!changes)
                        changes = 1;
                if (d->dirty_submodule)
                        *dirty_submodules = 1;
                if (d->worktree_status == DIFF_STATUS_DELETED)
                        changes = -1;
        }
        return changes;
}

static void wt_longstatus_print_changed(struct wt_status *s)
{
        int i, dirty_submodules;
        int worktree_changes = wt_status_check_worktree_changes(s, &dirty_submodules);

        if (!worktree_changes)
                return;

        wt_longstatus_print_dirty_header(s, worktree_changes < 0, dirty_submodules);

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;
                it = &(s->change.items[i]);
                d = it->util;
                if (!d->worktree_status ||
                    d->worktree_status == DIFF_STATUS_UNMERGED)
                        continue;
                wt_longstatus_print_change_data(s, WT_STATUS_CHANGED, it);
        }
        wt_longstatus_print_trailer(s);
}

static void wt_longstatus_print_submodule_summary(struct wt_status *s, int uncommitted)
{
        struct child_process sm_summary = CHILD_PROCESS_INIT;
        struct strbuf cmd_stdout = STRBUF_INIT;
        struct strbuf summary = STRBUF_INIT;
        char *summary_content;

        argv_array_pushf(&sm_summary.env_array, "GIT_INDEX_FILE=%s",
                         s->index_file);

        argv_array_push(&sm_summary.args, "submodule");
        argv_array_push(&sm_summary.args, "summary");
        argv_array_push(&sm_summary.args, uncommitted ? "--files" : "--cached");
        argv_array_push(&sm_summary.args, "--for-status");
        argv_array_push(&sm_summary.args, "--summary-limit");
        argv_array_pushf(&sm_summary.args, "%d", s->submodule_summary);
        if (!uncommitted)
                argv_array_push(&sm_summary.args, s->amend ? "HEAD^" : "HEAD");

        sm_summary.git_cmd = 1;
        sm_summary.no_stdin = 1;

        capture_command(&sm_summary, &cmd_stdout, 1024);

        /* prepend header, only if there's an actual output */
        if (cmd_stdout.len) {
                if (uncommitted)
                        strbuf_addstr(&summary, _("Submodules changed but not updated:"));
                else
                        strbuf_addstr(&summary, _("Submodule changes to be committed:"));
                strbuf_addstr(&summary, "\n\n");
        }
        strbuf_addbuf(&summary, &cmd_stdout);
        strbuf_release(&cmd_stdout);

        if (s->display_comment_prefix) {
                size_t len;
                summary_content = strbuf_detach(&summary, &len);
                strbuf_add_commented_lines(&summary, summary_content, len);
                free(summary_content);
        }

        fputs(summary.buf, s->fp);
        strbuf_release(&summary);
}

static void wt_longstatus_print_other(struct wt_status *s,
                                      struct string_list *l,
                                      const char *what,
                                      const char *how)
{
        int i;
        struct strbuf buf = STRBUF_INIT;
        static struct string_list output = STRING_LIST_INIT_DUP;
        struct column_options copts;

        if (!l->nr)
                return;

        wt_longstatus_print_other_header(s, what, how);

        for (i = 0; i < l->nr; i++) {
                struct string_list_item *it;
                const char *path;
                it = &(l->items[i]);
                path = quote_path(it->string, s->prefix, &buf);
                if (column_active(s->colopts)) {
                        string_list_append(&output, path);
                        continue;
                }
                status_printf(s, color(WT_STATUS_HEADER, s), "\t");
                status_printf_more(s, color(WT_STATUS_UNTRACKED, s),
                                   "%s\n", path);
        }

        strbuf_release(&buf);
        if (!column_active(s->colopts))
                goto conclude;

        strbuf_addf(&buf, "%s%s\t%s",
                    color(WT_STATUS_HEADER, s),
                    s->display_comment_prefix ? "#" : "",
                    color(WT_STATUS_UNTRACKED, s));
        memset(&copts, 0, sizeof(copts));
        copts.padding = 1;
        copts.indent = buf.buf;
        if (want_color(s->use_color))
                copts.nl = GIT_COLOR_RESET "\n";
        print_columns(&output, s->colopts, &copts);
        string_list_clear(&output, 0);
        strbuf_release(&buf);
conclude:
        status_printf_ln(s, GIT_COLOR_NORMAL, "%s", "");
}

void wt_status_truncate_message_at_cut_line(struct strbuf *buf)
{
        const char *p;
        struct strbuf pattern = STRBUF_INIT;

        strbuf_addf(&pattern, "\n%c %s", comment_line_char, cut_line);
        if (starts_with(buf->buf, pattern.buf + 1))
                strbuf_setlen(buf, 0);
        else if ((p = strstr(buf->buf, pattern.buf)))
                strbuf_setlen(buf, p - buf->buf + 1);
        strbuf_release(&pattern);
}

void wt_status_add_cut_line(FILE *fp)
{
        const char *explanation = _("Do not touch the line above.\nEverything below will be removed.");
        struct strbuf buf = STRBUF_INIT;

        fprintf(fp, "%c %s", comment_line_char, cut_line);
        strbuf_add_commented_lines(&buf, explanation, strlen(explanation));
        fputs(buf.buf, fp);
        strbuf_release(&buf);
}

static void wt_longstatus_print_verbose(struct wt_status *s)
{
        struct rev_info rev;
        struct setup_revision_opt opt;
        int dirty_submodules;
        const char *c = color(WT_STATUS_HEADER, s);

        init_revisions(&rev, NULL);
        DIFF_OPT_SET(&rev.diffopt, ALLOW_TEXTCONV);

        memset(&opt, 0, sizeof(opt));
        opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
        setup_revisions(0, NULL, &rev, &opt);

        rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
        rev.diffopt.detect_rename = 1;
        rev.diffopt.file = s->fp;
        rev.diffopt.close_file = 0;
        /*
         * If we're not going to stdout, then we definitely don't
         * want color, since we are going to the commit message
         * file (and even the "auto" setting won't work, since it
         * will have checked isatty on stdout). But we then do want
         * to insert the scissor line here to reliably remove the
         * diff before committing.
         */
        if (s->fp != stdout) {
                rev.diffopt.use_color = 0;
                wt_status_add_cut_line(s->fp);
        }
        if (s->verbose > 1 && s->commitable) {
                /* print_updated() printed a header, so do we */
                if (s->fp != stdout)
                        wt_longstatus_print_trailer(s);
                status_printf_ln(s, c, _("Changes to be committed:"));
                rev.diffopt.a_prefix = "c/";
                rev.diffopt.b_prefix = "i/";
        } /* else use prefix as per user config */
        run_diff_index(&rev, 1);
        if (s->verbose > 1 &&
            wt_status_check_worktree_changes(s, &dirty_submodules)) {
                status_printf_ln(s, c,
                        "--------------------------------------------------");
                status_printf_ln(s, c, _("Changes not staged for commit:"));
                setup_work_tree();
                rev.diffopt.a_prefix = "i/";
                rev.diffopt.b_prefix = "w/";
                run_diff_files(&rev, 0);
        }
}

static void wt_longstatus_print_tracking(struct wt_status *s)
{
        struct strbuf sb = STRBUF_INIT;
        const char *cp, *ep, *branch_name;
        struct branch *branch;
        char comment_line_string[3];
        int i;

        assert(s->branch && !s->is_initial);
        if (!skip_prefix(s->branch, "refs/heads/", &branch_name))
                return;
        branch = branch_get(branch_name);
        if (!format_tracking_info(branch, &sb))
                return;

        i = 0;
        if (s->display_comment_prefix) {
                comment_line_string[i++] = comment_line_char;
                comment_line_string[i++] = ' ';
        }
        comment_line_string[i] = '\0';

        for (cp = sb.buf; (ep = strchr(cp, '\n')) != NULL; cp = ep + 1)
                color_fprintf_ln(s->fp, color(WT_STATUS_HEADER, s),
                                 "%s%.*s", comment_line_string,
                                 (int)(ep - cp), cp);
        if (s->display_comment_prefix)
                color_fprintf_ln(s->fp, color(WT_STATUS_HEADER, s), "%c",
                                 comment_line_char);
        else
                fputs("", s->fp);
}

static int has_unmerged(struct wt_status *s)
{
        int i;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                d = s->change.items[i].util;
                if (d->stagemask)
                        return 1;
        }
        return 0;
}

static void show_merge_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        if (has_unmerged(s)) {
                status_printf_ln(s, color, _("You have unmerged paths."));
                if (s->hints) {
                        status_printf_ln(s, color,
                                         _("  (fix conflicts and run \"git commit\")"));
                        status_printf_ln(s, color,
                                         _("  (use \"git merge --abort\" to abort the merge)"));
                }
        } else {
                s-> commitable = 1;
                status_printf_ln(s, color,
                        _("All conflicts fixed but you are still merging."));
                if (s->hints)
                        status_printf_ln(s, color,
                                _("  (use \"git commit\" to conclude merge)"));
        }
        wt_longstatus_print_trailer(s);
}

static void show_am_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        status_printf_ln(s, color,
                _("You are in the middle of an am session."));
        if (state->am_empty_patch)
                status_printf_ln(s, color,
                        _("The current patch is empty."));
        if (s->hints) {
                if (!state->am_empty_patch)
                        status_printf_ln(s, color,
                                _("  (fix conflicts and then run \"git am --continue\")"));
                status_printf_ln(s, color,
                        _("  (use \"git am --skip\" to skip this patch)"));
                status_printf_ln(s, color,
                        _("  (use \"git am --abort\" to restore the original branch)"));
        }
        wt_longstatus_print_trailer(s);
}

static char *read_line_from_git_path(const char *filename)
{
        struct strbuf buf = STRBUF_INIT;
        FILE *fp = fopen(git_path("%s", filename), "r");
        if (!fp) {
                strbuf_release(&buf);
                return NULL;
        }
        strbuf_getline_lf(&buf, fp);
        if (!fclose(fp)) {
                return strbuf_detach(&buf, NULL);
        } else {
                strbuf_release(&buf);
                return NULL;
        }
}

static int split_commit_in_progress(struct wt_status *s)
{
        int split_in_progress = 0;
        char *head = read_line_from_git_path("HEAD");
        char *orig_head = read_line_from_git_path("ORIG_HEAD");
        char *rebase_amend = read_line_from_git_path("rebase-merge/amend");
        char *rebase_orig_head = read_line_from_git_path("rebase-merge/orig-head");

        if (!head || !orig_head || !rebase_amend || !rebase_orig_head ||
            !s->branch || strcmp(s->branch, "HEAD"))
                return split_in_progress;

        if (!strcmp(rebase_amend, rebase_orig_head)) {
                if (strcmp(head, rebase_amend))
                        split_in_progress = 1;
        } else if (strcmp(orig_head, rebase_orig_head)) {
                split_in_progress = 1;
        }

        if (!s->amend && !s->nowarn && !s->workdir_dirty)
                split_in_progress = 0;

        free(head);
        free(orig_head);
        free(rebase_amend);
        free(rebase_orig_head);
        return split_in_progress;
}

/*
 * Turn
 * "pick d6a2f0303e897ec257dd0e0a39a5ccb709bc2047 some message"
 * into
 * "pick d6a2f03 some message"
 *
 * The function assumes that the line does not contain useless spaces
 * before or after the command.
 */
static void abbrev_sha1_in_line(struct strbuf *line)
{
        struct strbuf **split;
        int i;

        if (starts_with(line->buf, "exec ") ||
            starts_with(line->buf, "x "))
                return;

        split = strbuf_split_max(line, ' ', 3);
        if (split[0] && split[1]) {
                unsigned char sha1[20];
                const char *abbrev;

                /*
                 * strbuf_split_max left a space. Trim it and re-add
                 * it after abbreviation.
                 */
                strbuf_trim(split[1]);
                if (!get_sha1(split[1]->buf, sha1)) {
                        abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
                        strbuf_reset(split[1]);
                        strbuf_addf(split[1], "%s ", abbrev);
                        strbuf_reset(line);
                        for (i = 0; split[i]; i++)
                                strbuf_addbuf(line, split[i]);
                }
        }
        strbuf_list_free(split);
}

static void read_rebase_todolist(const char *fname, struct string_list *lines)
{
        struct strbuf line = STRBUF_INIT;
        FILE *f = fopen(git_path("%s", fname), "r");

        if (!f)
                die_errno("Could not open file %s for reading",
                          git_path("%s", fname));
        while (!strbuf_getline_lf(&line, f)) {
                if (line.len && line.buf[0] == comment_line_char)
                        continue;
                strbuf_trim(&line);
                if (!line.len)
                        continue;
                abbrev_sha1_in_line(&line);
                string_list_append(lines, line.buf);
        }
}

static void show_rebase_information(struct wt_status *s,
                                        struct wt_status_state *state,
                                        const char *color)
{
        if (state->rebase_interactive_in_progress) {
                int i;
                int nr_lines_to_show = 2;

                struct string_list have_done = STRING_LIST_INIT_DUP;
                struct string_list yet_to_do = STRING_LIST_INIT_DUP;

                read_rebase_todolist("rebase-merge/done", &have_done);
                read_rebase_todolist("rebase-merge/git-rebase-todo", &yet_to_do);

                if (have_done.nr == 0)
                        status_printf_ln(s, color, _("No commands done."));
                else {
                        status_printf_ln(s, color,
                                Q_("Last command done (%d command done):",
                                        "Last commands done (%d commands done):",
                                        have_done.nr),
                                have_done.nr);
                        for (i = (have_done.nr > nr_lines_to_show)
                                ? have_done.nr - nr_lines_to_show : 0;
                                i < have_done.nr;
                                i++)
                                status_printf_ln(s, color, "   %s", have_done.items[i].string);
                        if (have_done.nr > nr_lines_to_show && s->hints)
                                status_printf_ln(s, color,
                                        _("  (see more in file %s)"), git_path("rebase-merge/done"));
                }

                if (yet_to_do.nr == 0)
                        status_printf_ln(s, color,
                                         _("No commands remaining."));
                else {
                        status_printf_ln(s, color,
                                Q_("Next command to do (%d remaining command):",
                                        "Next commands to do (%d remaining commands):",
                                        yet_to_do.nr),
                                yet_to_do.nr);
                        for (i = 0; i < nr_lines_to_show && i < yet_to_do.nr; i++)
                                status_printf_ln(s, color, "   %s", yet_to_do.items[i].string);
                        if (s->hints)
                                status_printf_ln(s, color,
                                        _("  (use \"git rebase --edit-todo\" to view and edit)"));
                }
                string_list_clear(&yet_to_do, 0);
                string_list_clear(&have_done, 0);
        }
}

static void print_rebase_state(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        if (state->branch)
                status_printf_ln(s, color,
                                 _("You are currently rebasing branch '%s' on '%s'."),
                                 state->branch,
                                 state->onto);
        else
                status_printf_ln(s, color,
                                 _("You are currently rebasing."));
}

static void show_rebase_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        struct stat st;

        show_rebase_information(s, state, color);
        if (has_unmerged(s)) {
                print_rebase_state(s, state, color);
                if (s->hints) {
                        status_printf_ln(s, color,
                                _("  (fix conflicts and then run \"git rebase --continue\")"));
                        status_printf_ln(s, color,
                                _("  (use \"git rebase --skip\" to skip this patch)"));
                        status_printf_ln(s, color,
                                _("  (use \"git rebase --abort\" to check out the original branch)"));
                }
        } else if (state->rebase_in_progress || !stat(git_path_merge_msg(), &st)) {
                print_rebase_state(s, state, color);
                if (s->hints)
                        status_printf_ln(s, color,
                                _("  (all conflicts fixed: run \"git rebase --continue\")"));
        } else if (split_commit_in_progress(s)) {
                if (state->branch)
                        status_printf_ln(s, color,
                                         _("You are currently splitting a commit while rebasing branch '%s' on '%s'."),
                                         state->branch,
                                         state->onto);
                else
                        status_printf_ln(s, color,
                                         _("You are currently splitting a commit during a rebase."));
                if (s->hints)
                        status_printf_ln(s, color,
                                _("  (Once your working directory is clean, run \"git rebase --continue\")"));
        } else {
                if (state->branch)
                        status_printf_ln(s, color,
                                         _("You are currently editing a commit while rebasing branch '%s' on '%s'."),
                                         state->branch,
                                         state->onto);
                else
                        status_printf_ln(s, color,
                                         _("You are currently editing a commit during a rebase."));
                if (s->hints && !s->amend) {
                        status_printf_ln(s, color,
                                _("  (use \"git commit --amend\" to amend the current commit)"));
                        status_printf_ln(s, color,
                                _("  (use \"git rebase --continue\" once you are satisfied with your changes)"));
                }
        }
        wt_longstatus_print_trailer(s);
}

static void show_cherry_pick_in_progress(struct wt_status *s,
                                        struct wt_status_state *state,
                                        const char *color)
{
        status_printf_ln(s, color, _("You are currently cherry-picking commit %s."),
                        find_unique_abbrev(state->cherry_pick_head_sha1, DEFAULT_ABBREV));
        if (s->hints) {
                if (has_unmerged(s))
                        status_printf_ln(s, color,
                                _("  (fix conflicts and run \"git cherry-pick --continue\")"));
                else
                        status_printf_ln(s, color,
                                _("  (all conflicts fixed: run \"git cherry-pick --continue\")"));
                status_printf_ln(s, color,
                        _("  (use \"git cherry-pick --abort\" to cancel the cherry-pick operation)"));
        }
        wt_longstatus_print_trailer(s);
}

static void show_revert_in_progress(struct wt_status *s,
                                        struct wt_status_state *state,
                                        const char *color)
{
        status_printf_ln(s, color, _("You are currently reverting commit %s."),
                         find_unique_abbrev(state->revert_head_sha1, DEFAULT_ABBREV));
        if (s->hints) {
                if (has_unmerged(s))
                        status_printf_ln(s, color,
                                _("  (fix conflicts and run \"git revert --continue\")"));
                else
                        status_printf_ln(s, color,
                                _("  (all conflicts fixed: run \"git revert --continue\")"));
                status_printf_ln(s, color,
                        _("  (use \"git revert --abort\" to cancel the revert operation)"));
        }
        wt_longstatus_print_trailer(s);
}

static void show_bisect_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        if (state->branch)
                status_printf_ln(s, color,
                                 _("You are currently bisecting, started from branch '%s'."),
                                 state->branch);
        else
                status_printf_ln(s, color,
                                 _("You are currently bisecting."));
        if (s->hints)
                status_printf_ln(s, color,
                        _("  (use \"git bisect reset\" to get back to the original branch)"));
        wt_longstatus_print_trailer(s);
}

/*
 * Extract branch information from rebase/bisect
 */
static char *get_branch(const struct worktree *wt, const char *path)
{
        struct strbuf sb = STRBUF_INIT;
        unsigned char sha1[20];
        const char *branch_name;

        if (strbuf_read_file(&sb, worktree_git_path(wt, "%s", path), 0) <= 0)
                goto got_nothing;

        while (sb.len && sb.buf[sb.len - 1] == '\n')
                strbuf_setlen(&sb, sb.len - 1);
        if (!sb.len)
                goto got_nothing;
        if (skip_prefix(sb.buf, "refs/heads/", &branch_name))
                strbuf_remove(&sb, 0, branch_name - sb.buf);
        else if (starts_with(sb.buf, "refs/"))
                ;
        else if (!get_sha1_hex(sb.buf, sha1)) {
                const char *abbrev;
                abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
                strbuf_reset(&sb);
                strbuf_addstr(&sb, abbrev);
        } else if (!strcmp(sb.buf, "detached HEAD")) /* rebase */
                goto got_nothing;
        else                    /* bisect */
                ;
        return strbuf_detach(&sb, NULL);

got_nothing:
        strbuf_release(&sb);
        return NULL;
}

struct grab_1st_switch_cbdata {
        struct strbuf buf;
        unsigned char nsha1[20];
};

static int grab_1st_switch(unsigned char *osha1, unsigned char *nsha1,
                           const char *email, unsigned long timestamp, int tz,
                           const char *message, void *cb_data)
{
        struct grab_1st_switch_cbdata *cb = cb_data;
        const char *target = NULL, *end;

        if (!skip_prefix(message, "checkout: moving from ", &message))
                return 0;
        target = strstr(message, " to ");
        if (!target)
                return 0;
        target += strlen(" to ");
        strbuf_reset(&cb->buf);
        hashcpy(cb->nsha1, nsha1);
        end = strchrnul(target, '\n');
        strbuf_add(&cb->buf, target, end - target);
        if (!strcmp(cb->buf.buf, "HEAD")) {
                /* HEAD is relative. Resolve it to the right reflog entry. */
                strbuf_reset(&cb->buf);
                strbuf_addstr(&cb->buf,
                              find_unique_abbrev(nsha1, DEFAULT_ABBREV));
        }
        return 1;
}

static void wt_status_get_detached_from(struct wt_status_state *state)
{
        struct grab_1st_switch_cbdata cb;
        struct commit *commit;
        unsigned char sha1[20];
        char *ref = NULL;

        strbuf_init(&cb.buf, 0);
        if (for_each_reflog_ent_reverse("HEAD", grab_1st_switch, &cb) <= 0) {
                strbuf_release(&cb.buf);
                return;
        }

        if (dwim_ref(cb.buf.buf, cb.buf.len, sha1, &ref) == 1 &&
            /* sha1 is a commit? match without further lookup */
            (!hashcmp(cb.nsha1, sha1) ||
             /* perhaps sha1 is a tag, try to dereference to a commit */
             ((commit = lookup_commit_reference_gently(sha1, 1)) != NULL &&
              !hashcmp(cb.nsha1, commit->object.oid.hash)))) {
                const char *from = ref;
                if (!skip_prefix(from, "refs/tags/", &from))
                        skip_prefix(from, "refs/remotes/", &from);
                state->detached_from = xstrdup(from);
        } else
                state->detached_from =
                        xstrdup(find_unique_abbrev(cb.nsha1, DEFAULT_ABBREV));
        hashcpy(state->detached_sha1, cb.nsha1);
        state->detached_at = !get_sha1("HEAD", sha1) &&
                             !hashcmp(sha1, state->detached_sha1);

        free(ref);
        strbuf_release(&cb.buf);
}

int wt_status_check_rebase(const struct worktree *wt,
                           struct wt_status_state *state)
{
        struct stat st;

        if (!stat(worktree_git_path(wt, "rebase-apply"), &st)) {
                if (!stat(worktree_git_path(wt, "rebase-apply/applying"), &st)) {
                        state->am_in_progress = 1;
                        if (!stat(worktree_git_path(wt, "rebase-apply/patch"), &st) && !st.st_size)
                                state->am_empty_patch = 1;
                } else {
                        state->rebase_in_progress = 1;
                        state->branch = get_branch(wt, "rebase-apply/head-name");
                        state->onto = get_branch(wt, "rebase-apply/onto");
                }
        } else if (!stat(worktree_git_path(wt, "rebase-merge"), &st)) {
                if (!stat(worktree_git_path(wt, "rebase-merge/interactive"), &st))
                        state->rebase_interactive_in_progress = 1;
                else
                        state->rebase_in_progress = 1;
                state->branch = get_branch(wt, "rebase-merge/head-name");
                state->onto = get_branch(wt, "rebase-merge/onto");
        } else
                return 0;
        return 1;
}

int wt_status_check_bisect(const struct worktree *wt,
                           struct wt_status_state *state)
{
        struct stat st;

        if (!stat(worktree_git_path(wt, "BISECT_LOG"), &st)) {
                state->bisect_in_progress = 1;
                state->branch = get_branch(wt, "BISECT_START");
                return 1;
        }
        return 0;
}

void wt_status_get_state(struct wt_status_state *state,
                         int get_detached_from)
{
        struct stat st;
        unsigned char sha1[20];

        if (!stat(git_path_merge_head(), &st)) {
                state->merge_in_progress = 1;
        } else if (wt_status_check_rebase(NULL, state)) {
                ;               /* all set */
        } else if (!stat(git_path_cherry_pick_head(), &st) &&
                        !get_sha1("CHERRY_PICK_HEAD", sha1)) {
                state->cherry_pick_in_progress = 1;
                hashcpy(state->cherry_pick_head_sha1, sha1);
        }
        wt_status_check_bisect(NULL, state);
        if (!stat(git_path_revert_head(), &st) &&
            !get_sha1("REVERT_HEAD", sha1)) {
                state->revert_in_progress = 1;
                hashcpy(state->revert_head_sha1, sha1);
        }

        if (get_detached_from)
                wt_status_get_detached_from(state);
}

static void wt_longstatus_print_state(struct wt_status *s,
                                      struct wt_status_state *state)
{
        const char *state_color = color(WT_STATUS_HEADER, s);
        if (state->merge_in_progress)
                show_merge_in_progress(s, state, state_color);
        else if (state->am_in_progress)
                show_am_in_progress(s, state, state_color);
        else if (state->rebase_in_progress || state->rebase_interactive_in_progress)
                show_rebase_in_progress(s, state, state_color);
        else if (state->cherry_pick_in_progress)
                show_cherry_pick_in_progress(s, state, state_color);
        else if (state->revert_in_progress)
                show_revert_in_progress(s, state, state_color);
        if (state->bisect_in_progress)
                show_bisect_in_progress(s, state, state_color);
}

static void wt_longstatus_print(struct wt_status *s)
{
        const char *branch_color = color(WT_STATUS_ONBRANCH, s);
        const char *branch_status_color = color(WT_STATUS_HEADER, s);
        struct wt_status_state state;

        memset(&state, 0, sizeof(state));
        wt_status_get_state(&state,
                            s->branch && !strcmp(s->branch, "HEAD"));

        if (s->branch) {
                const char *on_what = _("On branch ");
                const char *branch_name = s->branch;
                if (!strcmp(branch_name, "HEAD")) {
                        branch_status_color = color(WT_STATUS_NOBRANCH, s);
                        if (state.rebase_in_progress || state.rebase_interactive_in_progress) {
                                if (state.rebase_interactive_in_progress)
                                        on_what = _("interactive rebase in progress; onto ");
                                else
                                        on_what = _("rebase in progress; onto ");
                                branch_name = state.onto;
                        } else if (state.detached_from) {
                                branch_name = state.detached_from;
                                if (state.detached_at)
                                        on_what = _("HEAD detached at ");
                                else
                                        on_what = _("HEAD detached from ");
                        } else {
                                branch_name = "";
                                on_what = _("Not currently on any branch.");
                        }
                } else
                        skip_prefix(branch_name, "refs/heads/", &branch_name);
                status_printf(s, color(WT_STATUS_HEADER, s), "%s", "");
                status_printf_more(s, branch_status_color, "%s", on_what);
                status_printf_more(s, branch_color, "%s\n", branch_name);
                if (!s->is_initial)
                        wt_longstatus_print_tracking(s);
        }

        wt_longstatus_print_state(s, &state);
        free(state.branch);
        free(state.onto);
        free(state.detached_from);

        if (s->is_initial) {
                status_printf_ln(s, color(WT_STATUS_HEADER, s), "%s", "");
                status_printf_ln(s, color(WT_STATUS_HEADER, s), _("Initial commit"));
                status_printf_ln(s, color(WT_STATUS_HEADER, s), "%s", "");
        }

        wt_longstatus_print_updated(s);
        wt_longstatus_print_unmerged(s);
        wt_longstatus_print_changed(s);
        if (s->submodule_summary &&
            (!s->ignore_submodule_arg ||
             strcmp(s->ignore_submodule_arg, "all"))) {
                wt_longstatus_print_submodule_summary(s, 0);  /* staged */
                wt_longstatus_print_submodule_summary(s, 1);  /* unstaged */
        }
        if (s->show_untracked_files) {
                wt_longstatus_print_other(s, &s->untracked, _("Untracked files"), "add");
                if (s->show_ignored_files)
                        wt_longstatus_print_other(s, &s->ignored, _("Ignored files"), "add -f");
                if (advice_status_u_option && 2000 < s->untracked_in_ms) {
                        status_printf_ln(s, GIT_COLOR_NORMAL, "%s", "");
                        status_printf_ln(s, GIT_COLOR_NORMAL,
                                         _("It took %.2f seconds to enumerate untracked files. 'status -uno'\n"
                                           "may speed it up, but you have to be careful not to forget to add\n"
                                           "new files yourself (see 'git help status')."),
                                         s->untracked_in_ms / 1000.0);
                }
        } else if (s->commitable)
                status_printf_ln(s, GIT_COLOR_NORMAL, _("Untracked files not listed%s"),
                        s->hints
                        ? _(" (use -u option to show untracked files)") : "");

        if (s->verbose)
                wt_longstatus_print_verbose(s);
        if (!s->commitable) {
                if (s->amend)
                        status_printf_ln(s, GIT_COLOR_NORMAL, _("No changes"));
                else if (s->nowarn)
                        ; /* nothing */
                else if (s->workdir_dirty) {
                        if (s->hints)
                                printf(_("no changes added to commit "
                                         "(use \"git add\" and/or \"git commit -a\")\n"));
                        else
                                printf(_("no changes added to commit\n"));
                } else if (s->untracked.nr) {
                        if (s->hints)
                                printf(_("nothing added to commit but untracked files "
                                         "present (use \"git add\" to track)\n"));
                        else
                                printf(_("nothing added to commit but untracked files present\n"));
                } else if (s->is_initial) {
                        if (s->hints)
                                printf(_("nothing to commit (create/copy files "
                                         "and use \"git add\" to track)\n"));
                        else
                                printf(_("nothing to commit\n"));
                } else if (!s->show_untracked_files) {
                        if (s->hints)
                                printf(_("nothing to commit (use -u to show untracked files)\n"));
                        else
                                printf(_("nothing to commit\n"));
                } else
                        printf(_("nothing to commit, working tree clean\n"));
        }
}

static void wt_shortstatus_unmerged(struct string_list_item *it,
                           struct wt_status *s)
{
        struct wt_status_change_data *d = it->util;
        const char *how = "??";

        switch (d->stagemask) {
        case 1: how = "DD"; break; /* both deleted */
        case 2: how = "AU"; break; /* added by us */
        case 3: how = "UD"; break; /* deleted by them */
        case 4: how = "UA"; break; /* added by them */
        case 5: how = "DU"; break; /* deleted by us */
        case 6: how = "AA"; break; /* both added */
        case 7: how = "UU"; break; /* both modified */
        }
        color_fprintf(s->fp, color(WT_STATUS_UNMERGED, s), "%s", how);
        if (s->null_termination) {
                fprintf(stdout, " %s%c", it->string, 0);
        } else {
                struct strbuf onebuf = STRBUF_INIT;
                const char *one;
                one = quote_path(it->string, s->prefix, &onebuf);
                printf(" %s\n", one);
                strbuf_release(&onebuf);
        }
}

static void wt_shortstatus_status(struct string_list_item *it,
                         struct wt_status *s)
{
        struct wt_status_change_data *d = it->util;

        if (d->index_status)
                color_fprintf(s->fp, color(WT_STATUS_UPDATED, s), "%c", d->index_status);
        else
                putchar(' ');
        if (d->worktree_status)
                color_fprintf(s->fp, color(WT_STATUS_CHANGED, s), "%c", d->worktree_status);
        else
                putchar(' ');
        putchar(' ');
        if (s->null_termination) {
                fprintf(stdout, "%s%c", it->string, 0);
                if (d->head_path)
                        fprintf(stdout, "%s%c", d->head_path, 0);
        } else {
                struct strbuf onebuf = STRBUF_INIT;
                const char *one;
                if (d->head_path) {
                        one = quote_path(d->head_path, s->prefix, &onebuf);
                        if (*one != '"' && strchr(one, ' ') != NULL) {
                                putchar('"');
                                strbuf_addch(&onebuf, '"');
                                one = onebuf.buf;
                        }
                        printf("%s -> ", one);
                        strbuf_release(&onebuf);
                }
                one = quote_path(it->string, s->prefix, &onebuf);
                if (*one != '"' && strchr(one, ' ') != NULL) {
                        putchar('"');
                        strbuf_addch(&onebuf, '"');
                        one = onebuf.buf;
                }
                printf("%s\n", one);
                strbuf_release(&onebuf);
        }
}

static void wt_shortstatus_other(struct string_list_item *it,
                                 struct wt_status *s, const char *sign)
{
        if (s->null_termination) {
                fprintf(stdout, "%s %s%c", sign, it->string, 0);
        } else {
                struct strbuf onebuf = STRBUF_INIT;
                const char *one;
                one = quote_path(it->string, s->prefix, &onebuf);
                color_fprintf(s->fp, color(WT_STATUS_UNTRACKED, s), "%s", sign);
                printf(" %s\n", one);
                strbuf_release(&onebuf);
        }
}

static void wt_shortstatus_print_tracking(struct wt_status *s)
{
        struct branch *branch;
        const char *header_color = color(WT_STATUS_HEADER, s);
        const char *branch_color_local = color(WT_STATUS_LOCAL_BRANCH, s);
        const char *branch_color_remote = color(WT_STATUS_REMOTE_BRANCH, s);

        const char *base;
        const char *branch_name;
        int num_ours, num_theirs;
        int upstream_is_gone = 0;

        color_fprintf(s->fp, color(WT_STATUS_HEADER, s), "## ");

        if (!s->branch)
                return;
        branch_name = s->branch;

        if (s->is_initial)
                color_fprintf(s->fp, header_color, _("Initial commit on "));

        if (!strcmp(s->branch, "HEAD")) {
                color_fprintf(s->fp, color(WT_STATUS_NOBRANCH, s), "%s",
                              _("HEAD (no branch)"));
                goto conclude;
        }

        skip_prefix(branch_name, "refs/heads/", &branch_name);

        branch = branch_get(branch_name);

        color_fprintf(s->fp, branch_color_local, "%s", branch_name);

        if (stat_tracking_info(branch, &num_ours, &num_theirs, &base) < 0) {
                if (!base)
                        goto conclude;

                upstream_is_gone = 1;
        }

        base = shorten_unambiguous_ref(base, 0);
        color_fprintf(s->fp, header_color, "...");
        color_fprintf(s->fp, branch_color_remote, "%s", base);
        free((char *)base);

        if (!upstream_is_gone && !num_ours && !num_theirs)
                goto conclude;

#define LABEL(string) (s->no_gettext ? (string) : _(string))

        color_fprintf(s->fp, header_color, " [");
        if (upstream_is_gone) {
                color_fprintf(s->fp, header_color, LABEL(N_("gone")));
        } else if (!num_ours) {
                color_fprintf(s->fp, header_color, LABEL(N_("behind ")));
                color_fprintf(s->fp, branch_color_remote, "%d", num_theirs);
        } else if (!num_theirs) {
                color_fprintf(s->fp, header_color, LABEL(N_("ahead ")));
                color_fprintf(s->fp, branch_color_local, "%d", num_ours);
        } else {
                color_fprintf(s->fp, header_color, LABEL(N_("ahead ")));
                color_fprintf(s->fp, branch_color_local, "%d", num_ours);
                color_fprintf(s->fp, header_color, ", %s", LABEL(N_("behind ")));
                color_fprintf(s->fp, branch_color_remote, "%d", num_theirs);
        }

        color_fprintf(s->fp, header_color, "]");
 conclude:
        fputc(s->null_termination ? '\0' : '\n', s->fp);
}

static void wt_shortstatus_print(struct wt_status *s)
{
        int i;

        if (s->show_branch)
                wt_shortstatus_print_tracking(s);

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;

                it = &(s->change.items[i]);
                d = it->util;
                if (d->stagemask)
                        wt_shortstatus_unmerged(it, s);
                else
                        wt_shortstatus_status(it, s);
        }
        for (i = 0; i < s->untracked.nr; i++) {
                struct string_list_item *it;

                it = &(s->untracked.items[i]);
                wt_shortstatus_other(it, s, "??");
        }
        for (i = 0; i < s->ignored.nr; i++) {
                struct string_list_item *it;

                it = &(s->ignored.items[i]);
                wt_shortstatus_other(it, s, "!!");
        }
}

static void wt_porcelain_print(struct wt_status *s)
{
        s->use_color = 0;
        s->relative_paths = 0;
        s->prefix = NULL;
        s->no_gettext = 1;
        wt_shortstatus_print(s);
}

/*
 * Print branch information for porcelain v2 output.  These lines
 * are printed when the '--branch' parameter is given.
 *
 *    # branch.oid <commit><eol>
 *    # branch.head <head><eol>
 *   [# branch.upstream <upstream><eol>
 *   [# branch.ab +<ahead> -<behind><eol>]]
 *
 *      <commit> ::= the current commit hash or the the literal
 *                   "(initial)" to indicate an initialized repo
 *                   with no commits.
 *
 *        <head> ::= <branch_name> the current branch name or
 *                   "(detached)" literal when detached head or
 *                   "(unknown)" when something is wrong.
 *
 *    <upstream> ::= the upstream branch name, when set.
 *
 *       <ahead> ::= integer ahead value, when upstream set
 *                   and the commit is present (not gone).
 *
 *      <behind> ::= integer behind value, when upstream set
 *                   and commit is present.
 *
 *
 * The end-of-line is defined by the -z flag.
 *
 *                 <eol> ::= NUL when -z,
 *                           LF when NOT -z.
 *
 */
static void wt_porcelain_v2_print_tracking(struct wt_status *s)
{
        struct branch *branch;
        const char *base;
        const char *branch_name;
        struct wt_status_state state;
        int ab_info, nr_ahead, nr_behind;
        char eol = s->null_termination ? '\0' : '\n';

        memset(&state, 0, sizeof(state));
        wt_status_get_state(&state, s->branch && !strcmp(s->branch, "HEAD"));

        fprintf(s->fp, "# branch.oid %s%c",
                        (s->is_initial ? "(initial)" : sha1_to_hex(s->sha1_commit)),
                        eol);

        if (!s->branch)
                fprintf(s->fp, "# branch.head %s%c", "(unknown)", eol);
        else {
                if (!strcmp(s->branch, "HEAD")) {
                        fprintf(s->fp, "# branch.head %s%c", "(detached)", eol);

                        if (state.rebase_in_progress || state.rebase_interactive_in_progress)
                                branch_name = state.onto;
                        else if (state.detached_from)
                                branch_name = state.detached_from;
                        else
                                branch_name = "";
                } else {
                        branch_name = NULL;
                        skip_prefix(s->branch, "refs/heads/", &branch_name);

                        fprintf(s->fp, "# branch.head %s%c", branch_name, eol);
                }

                /* Lookup stats on the upstream tracking branch, if set. */
                branch = branch_get(branch_name);
                base = NULL;
                ab_info = (stat_tracking_info(branch, &nr_ahead, &nr_behind, &base) == 0);
                if (base) {
                        base = shorten_unambiguous_ref(base, 0);
                        fprintf(s->fp, "# branch.upstream %s%c", base, eol);
                        free((char *)base);

                        if (ab_info)
                                fprintf(s->fp, "# branch.ab +%d -%d%c", nr_ahead, nr_behind, eol);
                }
        }

        free(state.branch);
        free(state.onto);
        free(state.detached_from);
}

/*
 * Convert various submodule status values into a
 * fixed-length string of characters in the buffer provided.
 */
static void wt_porcelain_v2_submodule_state(
        struct wt_status_change_data *d,
        char sub[5])
{
        if (S_ISGITLINK(d->mode_head) ||
                S_ISGITLINK(d->mode_index) ||
                S_ISGITLINK(d->mode_worktree)) {
                sub[0] = 'S';
                sub[1] = d->new_submodule_commits ? 'C' : '.';
                sub[2] = (d->dirty_submodule & DIRTY_SUBMODULE_MODIFIED) ? 'M' : '.';
                sub[3] = (d->dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ? 'U' : '.';
        } else {
                sub[0] = 'N';
                sub[1] = '.';
                sub[2] = '.';
                sub[3] = '.';
        }
        sub[4] = 0;
}

/*
 * Fix-up changed entries before we print them.
 */
static void wt_porcelain_v2_fix_up_changed(
        struct string_list_item *it,
        struct wt_status *s)
{
        struct wt_status_change_data *d = it->util;

        if (!d->index_status) {
                /*
                 * This entry is unchanged in the index (relative to the head).
                 * Therefore, the collect_updated_cb was never called for this
                 * entry (during the head-vs-index scan) and so the head column
                 * fields were never set.
                 *
                 * We must have data for the index column (from the
                 * index-vs-worktree scan (otherwise, this entry should not be
                 * in the list of changes)).
                 *
                 * Copy index column fields to the head column, so that our
                 * output looks complete.
                 */
                assert(d->mode_head == 0);
                d->mode_head = d->mode_index;
                oidcpy(&d->oid_head, &d->oid_index);
        }

        if (!d->worktree_status) {
                /*
                 * This entry is unchanged in the worktree (relative to the index).
                 * Therefore, the collect_changed_cb was never called for this entry
                 * (during the index-vs-worktree scan) and so the worktree column
                 * fields were never set.
                 *
                 * We must have data for the index column (from the head-vs-index
                 * scan).
                 *
                 * Copy the index column fields to the worktree column so that
                 * our output looks complete.
                 *
                 * Note that we only have a mode field in the worktree column
                 * because the scan code tries really hard to not have to compute it.
                 */
                assert(d->mode_worktree == 0);
                d->mode_worktree = d->mode_index;
        }
}

/*
 * Print porcelain v2 info for tracked entries with changes.
 */
static void wt_porcelain_v2_print_changed_entry(
        struct string_list_item *it,
        struct wt_status *s)
{
        struct wt_status_change_data *d = it->util;
        struct strbuf buf_index = STRBUF_INIT;
        struct strbuf buf_head = STRBUF_INIT;
        const char *path_index = NULL;
        const char *path_head = NULL;
        char key[3];
        char submodule_token[5];
        char sep_char, eol_char;

        wt_porcelain_v2_fix_up_changed(it, s);
        wt_porcelain_v2_submodule_state(d, submodule_token);

        key[0] = d->index_status ? d->index_status : '.';
        key[1] = d->worktree_status ? d->worktree_status : '.';
        key[2] = 0;

        if (s->null_termination) {
                /*
                 * In -z mode, we DO NOT C-quote pathnames.  Current path is ALWAYS first.
                 * A single NUL character separates them.
                 */
                sep_char = '\0';
                eol_char = '\0';
                path_index = it->string;
                path_head = d->head_path;
        } else {
                /*
                 * Path(s) are C-quoted if necessary. Current path is ALWAYS first.
                 * The source path is only present when necessary.
                 * A single TAB separates them (because paths can contain spaces
                 * which are not escaped and C-quoting does escape TAB characters).
                 */
                sep_char = '\t';
                eol_char = '\n';
                path_index = quote_path(it->string, s->prefix, &buf_index);
                if (d->head_path)
                        path_head = quote_path(d->head_path, s->prefix, &buf_head);
        }

        if (path_head)
                fprintf(s->fp, "2 %s %s %06o %06o %06o %s %s %c%d %s%c%s%c",
                                key, submodule_token,
                                d->mode_head, d->mode_index, d->mode_worktree,
                                oid_to_hex(&d->oid_head), oid_to_hex(&d->oid_index),
                                key[0], d->score,
                                path_index, sep_char, path_head, eol_char);
        else
                fprintf(s->fp, "1 %s %s %06o %06o %06o %s %s %s%c",
                                key, submodule_token,
                                d->mode_head, d->mode_index, d->mode_worktree,
                                oid_to_hex(&d->oid_head), oid_to_hex(&d->oid_index),
                                path_index, eol_char);

        strbuf_release(&buf_index);
        strbuf_release(&buf_head);
}

/*
 * Print porcelain v2 status info for unmerged entries.
 */
static void wt_porcelain_v2_print_unmerged_entry(
        struct string_list_item *it,
        struct wt_status *s)
{
        struct wt_status_change_data *d = it->util;
        const struct cache_entry *ce;
        struct strbuf buf_index = STRBUF_INIT;
        const char *path_index = NULL;
        int pos, stage, sum;
        struct {
                int mode;
                struct object_id oid;
        } stages[3];
        char *key;
        char submodule_token[5];
        char unmerged_prefix = 'u';
        char eol_char = s->null_termination ? '\0' : '\n';

        wt_porcelain_v2_submodule_state(d, submodule_token);

        switch (d->stagemask) {
        case 1: key = "DD"; break; /* both deleted */
        case 2: key = "AU"; break; /* added by us */
        case 3: key = "UD"; break; /* deleted by them */
        case 4: key = "UA"; break; /* added by them */
        case 5: key = "DU"; break; /* deleted by us */
        case 6: key = "AA"; break; /* both added */
        case 7: key = "UU"; break; /* both modified */
        default:
                die("BUG: unhandled unmerged status %x", d->stagemask);
        }

        /*
         * Disregard d.aux.porcelain_v2 data that we accumulated
         * for the head and index columns during the scans and
         * replace with the actual stage data.
         *
         * Note that this is a last-one-wins for each the individual
         * stage [123] columns in the event of multiple cache entries
         * for same stage.
         */
        memset(stages, 0, sizeof(stages));
        sum = 0;
        pos = cache_name_pos(it->string, strlen(it->string));
        assert(pos < 0);
        pos = -pos-1;
        while (pos < active_nr) {
                ce = active_cache[pos++];
                stage = ce_stage(ce);
                if (strcmp(ce->name, it->string) || !stage)
                        break;
                stages[stage - 1].mode = ce->ce_mode;
                hashcpy(stages[stage - 1].oid.hash, ce->sha1);
                sum |= (1 << (stage - 1));
        }
        if (sum != d->stagemask)
                die("BUG: observed stagemask 0x%x != expected stagemask 0x%x", sum, d->stagemask);

        if (s->null_termination)
                path_index = it->string;
        else
                path_index = quote_path(it->string, s->prefix, &buf_index);

        fprintf(s->fp, "%c %s %s %06o %06o %06o %06o %s %s %s %s%c",
                        unmerged_prefix, key, submodule_token,
                        stages[0].mode, /* stage 1 */
                        stages[1].mode, /* stage 2 */
                        stages[2].mode, /* stage 3 */
                        d->mode_worktree,
                        oid_to_hex(&stages[0].oid), /* stage 1 */
                        oid_to_hex(&stages[1].oid), /* stage 2 */
                        oid_to_hex(&stages[2].oid), /* stage 3 */
                        path_index,
                        eol_char);

        strbuf_release(&buf_index);
}

/*
 * Print porcelain V2 status info for untracked and ignored entries.
 */
static void wt_porcelain_v2_print_other(
        struct string_list_item *it,
        struct wt_status *s,
        char prefix)
{
        struct strbuf buf = STRBUF_INIT;
        const char *path;
        char eol_char;

        if (s->null_termination) {
                path = it->string;
                eol_char = '\0';
        } else {
                path = quote_path(it->string, s->prefix, &buf);
                eol_char = '\n';
        }

        fprintf(s->fp, "%c %s%c", prefix, path, eol_char);

        strbuf_release(&buf);
}

/*
 * Print porcelain V2 status.
 *
 * [<v2_branch>]
 * [<v2_changed_items>]*
 * [<v2_unmerged_items>]*
 * [<v2_untracked_items>]*
 * [<v2_ignored_items>]*
 *
 */
static void wt_porcelain_v2_print(struct wt_status *s)
{
        struct wt_status_change_data *d;
        struct string_list_item *it;
        int i;

        if (s->show_branch)
                wt_porcelain_v2_print_tracking(s);

        for (i = 0; i < s->change.nr; i++) {
                it = &(s->change.items[i]);
                d = it->util;
                if (!d->stagemask)
                        wt_porcelain_v2_print_changed_entry(it, s);
        }

        for (i = 0; i < s->change.nr; i++) {
                it = &(s->change.items[i]);
                d = it->util;
                if (d->stagemask)
                        wt_porcelain_v2_print_unmerged_entry(it, s);
        }

        for (i = 0; i < s->untracked.nr; i++) {
                it = &(s->untracked.items[i]);
                wt_porcelain_v2_print_other(it, s, '?');
        }

        for (i = 0; i < s->ignored.nr; i++) {
                it = &(s->ignored.items[i]);
                wt_porcelain_v2_print_other(it, s, '!');
        }
}

void wt_status_print(struct wt_status *s)
{
        switch (s->status_format) {
        case STATUS_FORMAT_SHORT:
                wt_shortstatus_print(s);
                break;
        case STATUS_FORMAT_PORCELAIN:
                wt_porcelain_print(s);
                break;
        case STATUS_FORMAT_PORCELAIN_V2:
                wt_porcelain_v2_print(s);
                break;
        case STATUS_FORMAT_UNSPECIFIED:
                die("BUG: finalize_deferred_config() should have been called");
                break;
        case STATUS_FORMAT_NONE:
        case STATUS_FORMAT_LONG:
                wt_longstatus_print(s);
                break;
        }
}

/**
 * Returns 1 if there are unstaged changes, 0 otherwise.
 */
static int has_unstaged_changes(void)
{
        struct rev_info rev_info;
        int result;

        init_revisions(&rev_info, NULL);
        DIFF_OPT_SET(&rev_info.diffopt, IGNORE_SUBMODULES);
        DIFF_OPT_SET(&rev_info.diffopt, QUICK);
        diff_setup_done(&rev_info.diffopt);
        result = run_diff_files(&rev_info, 0);
        return diff_result_code(&rev_info.diffopt, result);
}

/**
 * Returns 1 if there are uncommitted changes, 0 otherwise.
 */
static int has_uncommitted_changes(void)
{
        struct rev_info rev_info;
        int result;

        if (is_cache_unborn())
                return 0;

        init_revisions(&rev_info, NULL);
        DIFF_OPT_SET(&rev_info.diffopt, IGNORE_SUBMODULES);
        DIFF_OPT_SET(&rev_info.diffopt, QUICK);
        add_head_to_pending(&rev_info);
        diff_setup_done(&rev_info.diffopt);
        result = run_diff_index(&rev_info, 1);
        return diff_result_code(&rev_info.diffopt, result);
}

/**
 * If the work tree has unstaged or uncommitted changes, dies with the
 * appropriate message.
 */
int require_clean_work_tree(const char *action, const char *hint, int gently)
{
        struct lock_file *lock_file = xcalloc(1, sizeof(*lock_file));
        int err = 0;

        hold_locked_index(lock_file, 0);
        refresh_cache(REFRESH_QUIET);
        update_index_if_able(&the_index, lock_file);
        rollback_lock_file(lock_file);

        if (has_unstaged_changes()) {
                /* TRANSLATORS: the action is e.g. "pull with rebase" */
                error(_("Cannot %s: You have unstaged changes."), _(action));
                err = 1;
        }

        if (has_uncommitted_changes()) {
                if (err)
                        error(_("Additionally, your index contains uncommitted changes."));
                else
                        error(_("Cannot %s: Your index contains uncommitted changes."),
                              _(action));
                err = 1;
        }

        if (err) {
                if (hint)
                        error("%s", hint);
                if (!gently)
                        exit(128);
        }

        return err;
}