Merge branch 'jh/maint-config-file-prefix' into maint
[git] / editor.c
1 #include "cache.h"
2 #include "strbuf.h"
3 #include "run-command.h"
4
5 #ifndef DEFAULT_EDITOR
6 #define DEFAULT_EDITOR "vi"
7 #endif
8
9 const char *git_editor(void)
10 {
11         const char *editor = getenv("GIT_EDITOR");
12         const char *terminal = getenv("TERM");
13         int terminal_is_dumb = !terminal || !strcmp(terminal, "dumb");
14
15         if (!editor && editor_program)
16                 editor = editor_program;
17         if (!editor && !terminal_is_dumb)
18                 editor = getenv("VISUAL");
19         if (!editor)
20                 editor = getenv("EDITOR");
21
22         if (!editor && terminal_is_dumb)
23                 return NULL;
24
25         if (!editor)
26                 editor = DEFAULT_EDITOR;
27
28         return editor;
29 }
30
31 int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
32 {
33         const char *editor = git_editor();
34
35         if (!editor)
36                 return error("Terminal is dumb, but EDITOR unset");
37
38         if (strcmp(editor, ":")) {
39                 size_t len = strlen(editor);
40                 int i = 0;
41                 int failed;
42                 const char *args[6];
43                 struct strbuf arg0 = STRBUF_INIT;
44
45                 if (strcspn(editor, "|&;<>()$`\\\"' \t\n*?[#~=%") != len) {
46                         /* there are specials */
47                         strbuf_addf(&arg0, "%s \"$@\"", editor);
48                         args[i++] = "sh";
49                         args[i++] = "-c";
50                         args[i++] = arg0.buf;
51                 }
52                 args[i++] = editor;
53                 args[i++] = path;
54                 args[i] = NULL;
55
56                 failed = run_command_v_opt_cd_env(args, 0, NULL, env);
57                 strbuf_release(&arg0);
58                 if (failed)
59                         return error("There was a problem with the editor '%s'.",
60                                         editor);
61         }
62
63         if (!buffer)
64                 return 0;
65         if (strbuf_read_file(buffer, path, 0) < 0)
66                 return error("could not read file '%s': %s",
67                                 path, strerror(errno));
68         return 0;
69 }