Merge branch 'en/rebase-consistency'
[git] / sideband.c
1 #include "cache.h"
2 #include "color.h"
3 #include "config.h"
4 #include "pkt-line.h"
5 #include "sideband.h"
6 #include "help.h"
7
8 struct keyword_entry {
9         /*
10          * We use keyword as config key so it should be a single alphanumeric word.
11          */
12         const char *keyword;
13         char color[COLOR_MAXLEN];
14 };
15
16 static struct keyword_entry keywords[] = {
17         { "hint",       GIT_COLOR_YELLOW },
18         { "warning",    GIT_COLOR_BOLD_YELLOW },
19         { "success",    GIT_COLOR_BOLD_GREEN },
20         { "error",      GIT_COLOR_BOLD_RED },
21 };
22
23 /* Returns a color setting (GIT_COLOR_NEVER, etc). */
24 static int use_sideband_colors(void)
25 {
26         static int use_sideband_colors_cached = -1;
27
28         const char *key = "color.remote";
29         struct strbuf sb = STRBUF_INIT;
30         char *value;
31         int i;
32
33         if (use_sideband_colors_cached >= 0)
34                 return use_sideband_colors_cached;
35
36         if (!git_config_get_string(key, &value)) {
37                 use_sideband_colors_cached = git_config_colorbool(key, value);
38         } else if (!git_config_get_string("color.ui", &value)) {
39                 use_sideband_colors_cached = git_config_colorbool("color.ui", value);
40         } else {
41                 use_sideband_colors_cached = GIT_COLOR_AUTO;
42         }
43
44         for (i = 0; i < ARRAY_SIZE(keywords); i++) {
45                 strbuf_reset(&sb);
46                 strbuf_addf(&sb, "%s.%s", key, keywords[i].keyword);
47                 if (git_config_get_string(sb.buf, &value))
48                         continue;
49                 if (color_parse(value, keywords[i].color))
50                         continue;
51         }
52         strbuf_release(&sb);
53         return use_sideband_colors_cached;
54 }
55
56 void list_config_color_sideband_slots(struct string_list *list, const char *prefix)
57 {
58         int i;
59
60         for (i = 0; i < ARRAY_SIZE(keywords); i++)
61                 list_config_item(list, prefix, keywords[i].keyword);
62 }
63
64 /*
65  * Optionally highlight one keyword in remote output if it appears at the start
66  * of the line. This should be called for a single line only, which is
67  * passed as the first N characters of the SRC array.
68  *
69  * NEEDSWORK: use "size_t n" instead for clarity.
70  */
71 static void maybe_colorize_sideband(struct strbuf *dest, const char *src, int n)
72 {
73         int i;
74
75         if (!want_color_stderr(use_sideband_colors())) {
76                 strbuf_add(dest, src, n);
77                 return;
78         }
79
80         while (0 < n && isspace(*src)) {
81                 strbuf_addch(dest, *src);
82                 src++;
83                 n--;
84         }
85
86         for (i = 0; i < ARRAY_SIZE(keywords); i++) {
87                 struct keyword_entry *p = keywords + i;
88                 int len = strlen(p->keyword);
89
90                 if (n <= len)
91                         continue;
92                 /*
93                  * Match case insensitively, so we colorize output from existing
94                  * servers regardless of the case that they use for their
95                  * messages. We only highlight the word precisely, so
96                  * "successful" stays uncolored.
97                  */
98                 if (!strncasecmp(p->keyword, src, len) && !isalnum(src[len])) {
99                         strbuf_addstr(dest, p->color);
100                         strbuf_add(dest, src, len);
101                         strbuf_addstr(dest, GIT_COLOR_RESET);
102                         n -= len;
103                         src += len;
104                         break;
105                 }
106         }
107
108         strbuf_add(dest, src, n);
109 }
110
111
112 /*
113  * Receive multiplexed output stream over git native protocol.
114  * in_stream is the input stream from the remote, which carries data
115  * in pkt_line format with band designator.  Demultiplex it into out
116  * and err and return error appropriately.  Band #1 carries the
117  * primary payload.  Things coming over band #2 is not necessarily
118  * error; they are usually informative message on the standard error
119  * stream, aka "verbose").  A message over band #3 is a signal that
120  * the remote died unexpectedly.  A flush() concludes the stream.
121  */
122
123 #define DISPLAY_PREFIX "remote: "
124
125 #define ANSI_SUFFIX "\033[K"
126 #define DUMB_SUFFIX "        "
127
128 int recv_sideband(const char *me, int in_stream, int out)
129 {
130         const char *suffix;
131         char buf[LARGE_PACKET_MAX + 1];
132         struct strbuf outbuf = STRBUF_INIT;
133         int retval = 0;
134
135         if (isatty(2) && !is_terminal_dumb())
136                 suffix = ANSI_SUFFIX;
137         else
138                 suffix = DUMB_SUFFIX;
139
140         while (!retval) {
141                 const char *b, *brk;
142                 int band, len;
143                 len = packet_read(in_stream, NULL, NULL, buf, LARGE_PACKET_MAX, 0);
144                 if (len == 0)
145                         break;
146                 if (len < 1) {
147                         strbuf_addf(&outbuf,
148                                     "%s%s: protocol error: no band designator",
149                                     outbuf.len ? "\n" : "", me);
150                         retval = SIDEBAND_PROTOCOL_ERROR;
151                         break;
152                 }
153                 band = buf[0] & 0xff;
154                 buf[len] = '\0';
155                 len--;
156                 switch (band) {
157                 case 3:
158                         strbuf_addf(&outbuf, "%s%s", outbuf.len ? "\n" : "",
159                                     DISPLAY_PREFIX);
160                         maybe_colorize_sideband(&outbuf, buf + 1, len);
161
162                         retval = SIDEBAND_REMOTE_ERROR;
163                         break;
164                 case 2:
165                         b = buf + 1;
166
167                         /*
168                          * Append a suffix to each nonempty line to clear the
169                          * end of the screen line.
170                          *
171                          * The output is accumulated in a buffer and
172                          * each line is printed to stderr using
173                          * write(2) to ensure inter-process atomicity.
174                          */
175                         while ((brk = strpbrk(b, "\n\r"))) {
176                                 int linelen = brk - b;
177
178                                 if (!outbuf.len)
179                                         strbuf_addstr(&outbuf, DISPLAY_PREFIX);
180                                 if (linelen > 0) {
181                                         maybe_colorize_sideband(&outbuf, b, linelen);
182                                         strbuf_addstr(&outbuf, suffix);
183                                 }
184
185                                 strbuf_addch(&outbuf, *brk);
186                                 xwrite(2, outbuf.buf, outbuf.len);
187                                 strbuf_reset(&outbuf);
188
189                                 b = brk + 1;
190                         }
191
192                         if (*b) {
193                                 strbuf_addstr(&outbuf, outbuf.len ?
194                                             "" : DISPLAY_PREFIX);
195                                 maybe_colorize_sideband(&outbuf, b, strlen(b));
196                         }
197                         break;
198                 case 1:
199                         write_or_die(out, buf + 1, len);
200                         break;
201                 default:
202                         strbuf_addf(&outbuf, "%s%s: protocol error: bad band #%d",
203                                     outbuf.len ? "\n" : "", me, band);
204                         retval = SIDEBAND_PROTOCOL_ERROR;
205                         break;
206                 }
207         }
208
209         if (outbuf.len) {
210                 strbuf_addch(&outbuf, '\n');
211                 xwrite(2, outbuf.buf, outbuf.len);
212         }
213         strbuf_release(&outbuf);
214         return retval;
215 }
216
217 /*
218  * fd is connected to the remote side; send the sideband data
219  * over multiplexed packet stream.
220  */
221 void send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
222 {
223         const char *p = data;
224
225         while (sz) {
226                 unsigned n;
227                 char hdr[5];
228
229                 n = sz;
230                 if (packet_max - 5 < n)
231                         n = packet_max - 5;
232                 if (0 <= band) {
233                         xsnprintf(hdr, sizeof(hdr), "%04x", n + 5);
234                         hdr[4] = band;
235                         write_or_die(fd, hdr, 5);
236                 } else {
237                         xsnprintf(hdr, sizeof(hdr), "%04x", n + 4);
238                         write_or_die(fd, hdr, 4);
239                 }
240                 write_or_die(fd, p, n);
241                 p += n;
242                 sz -= n;
243         }
244 }