Add post-merge hook, related documentation, and tests.

diff --git a/builtin-log.c b/builtin-log.c
index b9035ab7997612a91cd032e3cb1bcd5296585768..c6cc3aef5270fe64821146376354239d54de5a26 100644 (file)
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -16,6 +16,7 @@
 #include "refs.h"
 
 static int default_show_root = 1;
+static const char *fmt_patch_subject_prefix = "PATCH";
 
 /* this is in builtin-diff.c */
 void add_head(struct rev_info *revs);
@@ -54,10 +55,17 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
        rev->abbrev = DEFAULT_ABBREV;
        rev->commit_format = CMIT_FMT_DEFAULT;
        rev->verbose_header = 1;
+       rev->diffopt.recursive = 1;
        rev->show_root_diff = default_show_root;
+       rev->subject_prefix = fmt_patch_subject_prefix;
        argc = setup_revisions(argc, argv, rev, "HEAD");
        if (rev->diffopt.pickaxe || rev->diffopt.filter)
                rev->always_show_header = 0;
+       if (rev->diffopt.follow_renames) {
+               rev->always_show_header = 0;
+               if (rev->diffopt.nr_paths != 1)
+                       usage("git logs can only follow renames on one pathname at a time");
+       }
        for (i = 1; i < argc; i++) {
                const char *arg = argv[i];
                if (!strcmp(arg, "--decorate")) {
@@ -89,6 +97,12 @@ static int cmd_log_walk(struct rev_info *rev)
 
 static int git_log_config(const char *var, const char *value)
 {
+       if (!strcmp(var, "format.subjectprefix")) {
+               if (!value)
+                       die("format.subjectprefix without value");
+               fmt_patch_subject_prefix = xstrdup(value);
+               return 0;
+       }
        if (!strcmp(var, "log.showroot")) {
                default_show_root = git_config_bool(var, value);
                return 0;
@@ -103,7 +117,6 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
        git_config(git_log_config);
        init_revisions(&rev, prefix);
        rev.diff = 1;
-       rev.diffopt.recursive = 1;
        rev.simplify_history = 0;
        cmd_log_init(argc, argv, prefix, &rev);
        if (!rev.diffopt.output_format)
@@ -152,7 +165,6 @@ int cmd_show(int argc, const char **argv, const char *prefix)
        git_config(git_log_config);
        init_revisions(&rev, prefix);
        rev.diff = 1;
-       rev.diffopt.recursive = 1;
        rev.combine_merges = 1;
        rev.dense_combined_merges = 1;
        rev.always_show_header = 1;
@@ -285,6 +297,7 @@ static int git_format_config(const char *var, const char *value)
        if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
                return 0;
        }
+
        return git_log_config(var, value);
 }
 
@@ -424,6 +437,34 @@ static void gen_message_id(char *dest, unsigned int length, char *base)
                 (int)(email_end - email_start - 1), email_start + 1);
 }
 
+static const char *clean_message_id(const char *msg_id)
+{
+       char ch;
+       const char *a, *z, *m;
+       char *n;
+       size_t len;
+
+       m = msg_id;
+       while ((ch = *m) && (isspace(ch) || (ch == '<')))
+               m++;
+       a = m;
+       z = NULL;
+       while ((ch = *m)) {
+               if (!isspace(ch) && (ch != '>'))
+                       z = m;
+               m++;
+       }
+       if (!z)
+               die("insane in-reply-to: %s", msg_id);
+       if (++z == m)
+               return a;
+       len = z - a;
+       n = xmalloc(len + 1);
+       memcpy(n, a, len);
+       n[len] = 0;
+       return n;
+}
+
 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 {
        struct commit *commit;
@@ -454,6 +495,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        rev.diffopt.msg_sep = "";
        rev.diffopt.recursive = 1;
 
+       rev.subject_prefix = fmt_patch_subject_prefix;
        rev.extra_headers = extra_headers;
 
        /*
@@ -571,12 +613,19 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        }
 
        if (rev.pending.nr == 1) {
-               if (rev.max_count < 0) {
+               if (rev.max_count < 0 && !rev.show_root_diff) {
+                       /*
+                        * This is traditional behaviour of "git format-patch
+                        * origin" that prepares what the origin side still
+                        * does not have.
+                        */
                        rev.pending.objects[0].item->flags |= UNINTERESTING;
                        add_head(&rev);
                }
-               /* Otherwise, it is "format-patch -22 HEAD", and
-                * get_revision() would return only the specified count.
+               /*
+                * Otherwise, it is "format-patch -22 HEAD", and/or
+                * "format-patch --root HEAD".  The user wants
+                * get_revision() to do the usual traversal.
                 */
        }
 
@@ -584,7 +633,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                get_patch_ids(&rev, &ids, prefix);
 
        if (!use_stdout)
-               realstdout = fdopen(dup(1), "w");
+               realstdout = xfdopen(xdup(1), "w");
 
        prepare_revision_walk(&rev);
        while ((commit = get_revision(&rev)) != NULL) {
@@ -604,7 +653,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        if (numbered)
                rev.total = total + start_number - 1;
        rev.add_signoff = add_signoff;
-       rev.ref_message_id = in_reply_to;
+       if (in_reply_to)
+               rev.ref_message_id = clean_message_id(in_reply_to);
        while (0 <= --nr) {
                int shown;
                commit = list[nr];