git-count-objects: Fix a disk-space under-estimate on Cygwin

[thirdparty/git.git] / builtin-mailinfo.c

diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index 92637ac0bae82d0b88e267b572a51a75299cda5c..c90cd312ac99fe9a2169664e86a089b5378cacbe 100644 (file)
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -25,6 +25,7 @@ static enum  {
 static struct strbuf charset = STRBUF_INIT;
 static int patch_lines;
 static struct strbuf **p_hdr_data, **s_hdr_data;
+static int use_scissors;
 
 #define MAX_HDR_PARSED 10
 #define MAX_BOUNDARIES 5
@@ -712,6 +713,56 @@ static inline int patchbreak(const struct strbuf *line)
        return 0;
 }
 
+static int is_scissors_line(const struct strbuf *line)
+{
+       size_t i, len = line->len;
+       int scissors = 0, gap = 0;
+       int first_nonblank = -1;
+       int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
+       const char *buf = line->buf;
+
+       for (i = 0; i < len; i++) {
+               if (isspace(buf[i])) {
+                       if (in_perforation) {
+                               perforation++;
+                               gap++;
+                       }
+                       continue;
+               }
+               last_nonblank = i;
+               if (first_nonblank < 0)
+                       first_nonblank = i;
+               if (buf[i] == '-') {
+                       in_perforation = 1;
+                       perforation++;
+                       continue;
+               }
+               if (i + 1 < len &&
+                   (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2))) {
+                       in_perforation = 1;
+                       perforation += 2;
+                       scissors += 2;
+                       i++;
+                       continue;
+               }
+               in_perforation = 0;
+       }
+
+       /*
+        * The mark must be at least 8 bytes long (e.g. "-- >8 --").
+        * Even though there can be arbitrary cruft on the same line
+        * (e.g. "cut here"), in order to avoid misidentification, the
+        * perforation must occupy more than a third of the visible
+        * width of the line, and dashes and scissors must occupy more
+        * than half of the perforation.
+        */
+
+       visible = last_nonblank - first_nonblank + 1;
+       return (scissors && 8 <= visible &&
+               visible < perforation * 3 &&
+               gap * 2 < perforation);
+}
+
 static int handle_commit_msg(struct strbuf *line)
 {
        static int still_looking = 1;
@@ -723,7 +774,8 @@ static int handle_commit_msg(struct strbuf *line)
                strbuf_ltrim(line);
                if (!line->len)
                        return 0;
-               if ((still_looking = check_header(line, s_hdr_data, 0)) != 0)
+               still_looking = check_header(line, s_hdr_data, 0);
+               if (still_looking)
                        return 0;
        }
 
@@ -731,6 +783,26 @@ static int handle_commit_msg(struct strbuf *line)
        if (metainfo_charset)
                convert_to_utf8(line, charset.buf);
 
+       if (use_scissors && is_scissors_line(line)) {
+               int i;
+               if (fseek(cmitmsg, 0L, SEEK_SET))
+                       die_errno("Could not rewind output message file");
+               if (ftruncate(fileno(cmitmsg), 0))
+                       die_errno("Could not truncate output message file at scissors");
+               still_looking = 1;
+
+               /*
+                * We may have already read "secondary headers"; purge
+                * them to give ourselves a clean restart.
+                */
+               for (i = 0; header[i]; i++) {
+                       if (s_hdr_data[i])
+                               strbuf_release(s_hdr_data[i]);
+                       s_hdr_data[i] = NULL;
+               }
+               return 0;
+       }
+
        if (patchbreak(line)) {
                fclose(cmitmsg);
                cmitmsg = NULL;
@@ -765,7 +837,6 @@ static void handle_filter(struct strbuf *line)
 
 static void handle_body(void)
 {
-       int len = 0;
        struct strbuf prev = STRBUF_INIT;
 
        /* Skip up to the first boundary */
@@ -775,8 +846,6 @@ static void handle_body(void)
        }
 
        do {
-               strbuf_setlen(&line, line.len + len);
-
                /* process any boundary lines */
                if (*content_top && is_multipart_boundary(&line)) {
                        /* flush any leftover */
@@ -832,10 +901,7 @@ static void handle_body(void)
                        handle_filter(&line);
                }
 
-               strbuf_reset(&line);
-               if (strbuf_avail(&line) < 100)
-                       strbuf_grow(&line, 100);
-       } while ((len = read_line_with_nul(line.buf, strbuf_avail(&line), fin)));
+       } while (!strbuf_getwholeline(&line, fin, '\n'));
 
 handle_body_out:
        strbuf_release(&prev);
@@ -891,12 +957,9 @@ static void handle_info(void)
        fprintf(fout, "\n");
 }
 
-static int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
-                   const char *msg, const char *patch)
+static int mailinfo(FILE *in, FILE *out, const char *msg, const char *patch)
 {
        int peek;
-       keep_subject = ks;
-       metainfo_charset = encoding;
        fin = in;
        fout = out;
 
@@ -930,8 +993,20 @@ static int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
        return 0;
 }
 
+static int git_mailinfo_config(const char *var, const char *value, void *unused)
+{
+       if (prefixcmp(var, "mailinfo."))
+               return git_default_config(var, value, unused);
+       if (!strcmp(var, "mailinfo.scissors")) {
+               use_scissors = git_config_bool(var, value);
+               return 0;
+       }
+       /* perhaps others here */
+       return 0;
+}
+
 static const char mailinfo_usage[] =
-       "git mailinfo [-k] [-u | --encoding=<encoding> | -n] msg patch <mail >info";
+       "git mailinfo [-k] [-u | --encoding=<encoding> | -n] [--scissors | --no-scissors] msg patch < mail >info";
 
 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 {
@@ -940,7 +1015,7 @@ int cmd_mailinfo(int argc, const char **argv, const char *prefix)
        /* NEEDSWORK: might want to do the optional .git/ directory
         * discovery
         */
-       git_config(git_default_config, NULL);
+       git_config(git_mailinfo_config, NULL);
 
        def_charset = (git_commit_encoding ? git_commit_encoding : "UTF-8");
        metainfo_charset = def_charset;
@@ -954,6 +1029,10 @@ int cmd_mailinfo(int argc, const char **argv, const char *prefix)
                        metainfo_charset = NULL;
                else if (!prefixcmp(argv[1], "--encoding="))
                        metainfo_charset = argv[1] + 11;
+               else if (!strcmp(argv[1], "--scissors"))
+                       use_scissors = 1;
+               else if (!strcmp(argv[1], "--no-scissors"))
+                       use_scissors = 0;
                else
                        usage(mailinfo_usage);
                argc--; argv++;
@@ -962,5 +1041,5 @@ int cmd_mailinfo(int argc, const char **argv, const char *prefix)
        if (argc != 3)
                usage(mailinfo_usage);
 
-       return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
+       return !!mailinfo(stdin, stdout, argv[1], argv[2]);
 }