expose a helper function peel_to_type().
[gitweb.git] / pretty.c
index 490cede263020dc15f4d48af06faf8d77552883f..b987ff245b310a6693dc69ba8c71ef2915da7864 100644 (file)
--- a/pretty.c
+++ b/pretty.c
@@ -1,6 +1,5 @@
 #include "cache.h"
 #include "commit.h"
-#include "interpolate.h"
 #include "utf8.h"
 #include "diff.h"
 #include "revision.h"
@@ -283,7 +282,8 @@ static char *logmsg_reencode(const struct commit *commit,
        return out;
 }
 
-static void fill_person(struct interp *table, const char *msg, int len)
+static void format_person_part(struct strbuf *sb, char part,
+                               const char *msg, int len)
 {
        int start, end, tz = 0;
        unsigned long date;
@@ -292,22 +292,36 @@ static void fill_person(struct interp *table, const char *msg, int len)
        /* parse name */
        for (end = 0; end < len && msg[end] != '<'; end++)
                ; /* do nothing */
+       /*
+        * If it does not even have a '<' and '>', that is
+        * quite a bogus commit author and we discard it;
+        * this is in line with add_user_info() that is used
+        * in the normal codepath.  When end points at the '<'
+        * that we found, it should have matching '>' later,
+        * which means start (beginning of email address) must
+        * be strictly below len.
+        */
        start = end + 1;
+       if (start >= len - 1)
+               return;
        while (end > 0 && isspace(msg[end - 1]))
                end--;
-       table[0].value = xmemdupz(msg, end);
-
-       if (start >= len)
+       if (part == 'n') {      /* name */
+               strbuf_add(sb, msg, end);
                return;
+       }
 
        /* parse email */
-       for (end = start + 1; end < len && msg[end] != '>'; end++)
+       for (end = start; end < len && msg[end] != '>'; end++)
                ; /* do nothing */
 
        if (end >= len)
                return;
 
-       table[1].value = xmemdupz(msg + start, end - start);
+       if (part == 'e') {      /* email */
+               strbuf_add(sb, msg + start, end - start);
+               return;
+       }
 
        /* parse date */
        for (start = end + 1; start < len && isspace(msg[start]); start++)
@@ -318,7 +332,10 @@ static void fill_person(struct interp *table, const char *msg, int len)
        if (msg + start == ep)
                return;
 
-       table[5].value = xmemdupz(msg + start, ep - (msg + start));
+       if (part == 't') {      /* date, UNIX timestamp */
+               strbuf_add(sb, msg + start, ep - (msg + start));
+               return;
+       }
 
        /* parse tz */
        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
@@ -329,115 +346,66 @@ static void fill_person(struct interp *table, const char *msg, int len)
                        tz = -tz;
        }
 
-       interp_set_entry(table, 2, show_date(date, tz, DATE_NORMAL));
-       interp_set_entry(table, 3, show_date(date, tz, DATE_RFC2822));
-       interp_set_entry(table, 4, show_date(date, tz, DATE_RELATIVE));
-       interp_set_entry(table, 6, show_date(date, tz, DATE_ISO8601));
+       switch (part) {
+       case 'd':       /* date */
+               strbuf_addstr(sb, show_date(date, tz, DATE_NORMAL));
+               return;
+       case 'D':       /* date, RFC2822 style */
+               strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
+               return;
+       case 'r':       /* date, relative */
+               strbuf_addstr(sb, show_date(date, tz, DATE_RELATIVE));
+               return;
+       case 'i':       /* date, ISO 8601 */
+               strbuf_addstr(sb, show_date(date, tz, DATE_ISO8601));
+               return;
+       }
 }
 
-void format_commit_message(const struct commit *commit,
-                           const void *format, struct strbuf *sb)
-{
-       struct interp table[] = {
-               { "%H" },       /* commit hash */
-               { "%h" },       /* abbreviated commit hash */
-               { "%T" },       /* tree hash */
-               { "%t" },       /* abbreviated tree hash */
-               { "%P" },       /* parent hashes */
-               { "%p" },       /* abbreviated parent hashes */
-               { "%an" },      /* author name */
-               { "%ae" },      /* author email */
-               { "%ad" },      /* author date */
-               { "%aD" },      /* author date, RFC2822 style */
-               { "%ar" },      /* author date, relative */
-               { "%at" },      /* author date, UNIX timestamp */
-               { "%ai" },      /* author date, ISO 8601 */
-               { "%cn" },      /* committer name */
-               { "%ce" },      /* committer email */
-               { "%cd" },      /* committer date */
-               { "%cD" },      /* committer date, RFC2822 style */
-               { "%cr" },      /* committer date, relative */
-               { "%ct" },      /* committer date, UNIX timestamp */
-               { "%ci" },      /* committer date, ISO 8601 */
-               { "%e" },       /* encoding */
-               { "%s" },       /* subject */
-               { "%b" },       /* body */
-               { "%Cred" },    /* red */
-               { "%Cgreen" },  /* green */
-               { "%Cblue" },   /* blue */
-               { "%Creset" },  /* reset color */
-               { "%n" },       /* newline */
-               { "%m" },       /* left/right/bottom */
-       };
-       enum interp_index {
-               IHASH = 0, IHASH_ABBREV,
-               ITREE, ITREE_ABBREV,
-               IPARENTS, IPARENTS_ABBREV,
-               IAUTHOR_NAME, IAUTHOR_EMAIL,
-               IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
-               IAUTHOR_TIMESTAMP, IAUTHOR_ISO8601,
-               ICOMMITTER_NAME, ICOMMITTER_EMAIL,
-               ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
-               ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
-               ICOMMITTER_ISO8601,
-               IENCODING,
-               ISUBJECT,
-               IBODY,
-               IRED, IGREEN, IBLUE, IRESET_COLOR,
-               INEWLINE,
-               ILEFT_RIGHT,
-       };
-       struct commit_list *p;
-       char parents[1024];
-       unsigned long len;
-       int i;
-       enum { HEADER, SUBJECT, BODY } state;
-       const char *msg = commit->buffer;
+struct chunk {
+       size_t off;
+       size_t len;
+};
 
-       if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
-               die("invalid interp table!");
+struct format_commit_context {
+       const struct commit *commit;
+
+       /* These offsets are relative to the start of the commit message. */
+       int commit_header_parsed;
+       struct chunk subject;
+       struct chunk author;
+       struct chunk committer;
+       struct chunk encoding;
+       size_t body_off;
+
+       /* The following ones are relative to the result struct strbuf. */
+       struct chunk abbrev_commit_hash;
+       struct chunk abbrev_tree_hash;
+       struct chunk abbrev_parent_hashes;
+};
 
-       /* these are independent of the commit */
-       interp_set_entry(table, IRED, "\033[31m");
-       interp_set_entry(table, IGREEN, "\033[32m");
-       interp_set_entry(table, IBLUE, "\033[34m");
-       interp_set_entry(table, IRESET_COLOR, "\033[m");
-       interp_set_entry(table, INEWLINE, "\n");
+static int add_again(struct strbuf *sb, struct chunk *chunk)
+{
+       if (chunk->len) {
+               strbuf_adddup(sb, chunk->off, chunk->len);
+               return 1;
+       }
 
-       /* these depend on the commit */
-       if (!commit->object.parsed)
-               parse_object(commit->object.sha1);
-       interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
-       interp_set_entry(table, IHASH_ABBREV,
-                       find_unique_abbrev(commit->object.sha1,
-                               DEFAULT_ABBREV));
-       interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
-       interp_set_entry(table, ITREE_ABBREV,
-                       find_unique_abbrev(commit->tree->object.sha1,
-                               DEFAULT_ABBREV));
-       interp_set_entry(table, ILEFT_RIGHT,
-                        (commit->object.flags & BOUNDARY)
-                        ? "-"
-                        : (commit->object.flags & SYMMETRIC_LEFT)
-                        ? "<"
-                        : ">");
-
-       parents[1] = 0;
-       for (i = 0, p = commit->parents;
-                       p && i < sizeof(parents) - 1;
-                       p = p->next)
-               i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
-                       sha1_to_hex(p->item->object.sha1));
-       interp_set_entry(table, IPARENTS, parents + 1);
-
-       parents[1] = 0;
-       for (i = 0, p = commit->parents;
-                       p && i < sizeof(parents) - 1;
-                       p = p->next)
-               i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
-                       find_unique_abbrev(p->item->object.sha1,
-                               DEFAULT_ABBREV));
-       interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
+       /*
+        * We haven't seen this chunk before.  Our caller is surely
+        * going to add it the hard way now.  Remember the most likely
+        * start of the to-be-added chunk: the current end of the
+        * struct strbuf.
+        */
+       chunk->off = sb->len;
+       return 0;
+}
+
+static void parse_commit_header(struct format_commit_context *context)
+{
+       const char *msg = context->commit->buffer;
+       int i;
+       enum { HEADER, SUBJECT, BODY } state;
 
        for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
                int eol;
@@ -445,37 +413,181 @@ void format_commit_message(const struct commit *commit,
                        ; /* do nothing */
 
                if (state == SUBJECT) {
-                       table[ISUBJECT].value = xmemdupz(msg + i, eol - i);
+                       context->subject.off = i;
+                       context->subject.len = eol - i;
                        i = eol;
                }
                if (i == eol) {
                        state++;
                        /* strip empty lines */
-                       while (msg[eol + 1] == '\n')
+                       while (msg[eol] == '\n' && msg[eol + 1] == '\n')
                                eol++;
-               } else if (!prefixcmp(msg + i, "author "))
-                       fill_person(table + IAUTHOR_NAME,
-                                       msg + i + 7, eol - i - 7);
-               else if (!prefixcmp(msg + i, "committer "))
-                       fill_person(table + ICOMMITTER_NAME,
-                                       msg + i + 10, eol - i - 10);
-               else if (!prefixcmp(msg + i, "encoding "))
-                       table[IENCODING].value =
-                               xmemdupz(msg + i + 9, eol - i - 9);
+               } else if (!prefixcmp(msg + i, "author ")) {
+                       context->author.off = i + 7;
+                       context->author.len = eol - i - 7;
+               } else if (!prefixcmp(msg + i, "committer ")) {
+                       context->committer.off = i + 10;
+                       context->committer.len = eol - i - 10;
+               } else if (!prefixcmp(msg + i, "encoding ")) {
+                       context->encoding.off = i + 9;
+                       context->encoding.len = eol - i - 9;
+               }
                i = eol;
+               if (!msg[i])
+                       break;
        }
-       if (msg[i])
-               table[IBODY].value = xstrdup(msg + i);
+       context->body_off = i;
+       context->commit_header_parsed = 1;
+}
 
-       len = interpolate(sb->buf + sb->len, strbuf_avail(sb),
-                               format, table, ARRAY_SIZE(table));
-       if (len > strbuf_avail(sb)) {
-               strbuf_grow(sb, len);
-               interpolate(sb->buf + sb->len, strbuf_avail(sb) + 1,
-                                       format, table, ARRAY_SIZE(table));
+static void format_commit_item(struct strbuf *sb, const char *placeholder,
+                               void *context)
+{
+       struct format_commit_context *c = context;
+       const struct commit *commit = c->commit;
+       const char *msg = commit->buffer;
+       struct commit_list *p;
+
+       /* these are independent of the commit */
+       switch (placeholder[0]) {
+       case 'C':
+               switch (placeholder[3]) {
+               case 'd':       /* red */
+                       strbuf_addstr(sb, "\033[31m");
+                       return;
+               case 'e':       /* green */
+                       strbuf_addstr(sb, "\033[32m");
+                       return;
+               case 'u':       /* blue */
+                       strbuf_addstr(sb, "\033[34m");
+                       return;
+               case 's':       /* reset color */
+                       strbuf_addstr(sb, "\033[m");
+                       return;
+               }
+       case 'n':               /* newline */
+               strbuf_addch(sb, '\n');
+               return;
        }
-       strbuf_setlen(sb, sb->len + len);
-       interp_clear_table(table, ARRAY_SIZE(table));
+
+       /* these depend on the commit */
+       if (!commit->object.parsed)
+               parse_object(commit->object.sha1);
+
+       switch (placeholder[0]) {
+       case 'H':               /* commit hash */
+               strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
+               return;
+       case 'h':               /* abbreviated commit hash */
+               if (add_again(sb, &c->abbrev_commit_hash))
+                       return;
+               strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
+                                                    DEFAULT_ABBREV));
+               c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
+               return;
+       case 'T':               /* tree hash */
+               strbuf_addstr(sb, sha1_to_hex(commit->tree->object.sha1));
+               return;
+       case 't':               /* abbreviated tree hash */
+               if (add_again(sb, &c->abbrev_tree_hash))
+                       return;
+               strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
+                                                    DEFAULT_ABBREV));
+               c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
+               return;
+       case 'P':               /* parent hashes */
+               for (p = commit->parents; p; p = p->next) {
+                       if (p != commit->parents)
+                               strbuf_addch(sb, ' ');
+                       strbuf_addstr(sb, sha1_to_hex(p->item->object.sha1));
+               }
+               return;
+       case 'p':               /* abbreviated parent hashes */
+               if (add_again(sb, &c->abbrev_parent_hashes))
+                       return;
+               for (p = commit->parents; p; p = p->next) {
+                       if (p != commit->parents)
+                               strbuf_addch(sb, ' ');
+                       strbuf_addstr(sb, find_unique_abbrev(
+                                       p->item->object.sha1, DEFAULT_ABBREV));
+               }
+               c->abbrev_parent_hashes.len = sb->len -
+                                             c->abbrev_parent_hashes.off;
+               return;
+       case 'm':               /* left/right/bottom */
+               strbuf_addch(sb, (commit->object.flags & BOUNDARY)
+                                ? '-'
+                                : (commit->object.flags & SYMMETRIC_LEFT)
+                                ? '<'
+                                : '>');
+               return;
+       }
+
+       /* For the rest we have to parse the commit header. */
+       if (!c->commit_header_parsed)
+               parse_commit_header(c);
+
+       switch (placeholder[0]) {
+       case 's':
+               strbuf_add(sb, msg + c->subject.off, c->subject.len);
+               return;
+       case 'a':
+               format_person_part(sb, placeholder[1],
+                                  msg + c->author.off, c->author.len);
+               return;
+       case 'c':
+               format_person_part(sb, placeholder[1],
+                                  msg + c->committer.off, c->committer.len);
+               return;
+       case 'e':
+               strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
+               return;
+       case 'b':
+               strbuf_addstr(sb, msg + c->body_off);
+               return;
+       }
+}
+
+void format_commit_message(const struct commit *commit,
+                           const void *format, struct strbuf *sb)
+{
+       const char *placeholders[] = {
+               "H",            /* commit hash */
+               "h",            /* abbreviated commit hash */
+               "T",            /* tree hash */
+               "t",            /* abbreviated tree hash */
+               "P",            /* parent hashes */
+               "p",            /* abbreviated parent hashes */
+               "an",           /* author name */
+               "ae",           /* author email */
+               "ad",           /* author date */
+               "aD",           /* author date, RFC2822 style */
+               "ar",           /* author date, relative */
+               "at",           /* author date, UNIX timestamp */
+               "ai",           /* author date, ISO 8601 */
+               "cn",           /* committer name */
+               "ce",           /* committer email */
+               "cd",           /* committer date */
+               "cD",           /* committer date, RFC2822 style */
+               "cr",           /* committer date, relative */
+               "ct",           /* committer date, UNIX timestamp */
+               "ci",           /* committer date, ISO 8601 */
+               "e",            /* encoding */
+               "s",            /* subject */
+               "b",            /* body */
+               "Cred",         /* red */
+               "Cgreen",       /* green */
+               "Cblue",        /* blue */
+               "Creset",       /* reset color */
+               "n",            /* newline */
+               "m",            /* left/right/bottom */
+               NULL
+       };
+       struct format_commit_context context;
+
+       memset(&context, 0, sizeof(context));
+       context.commit = commit;
+       strbuf_expand(sb, format, placeholders, format_commit_item, &context);
 }
 
 static void pp_header(enum cmit_fmt fmt,