Merge branch 'jc/maint-blame-no-such-path'
[git.git] / builtin / blame.c
index ed5d01b36a309a53619c2615aed2382b2aebf056..c27ef21c2326afd29a68146d23c734c7ea708556 100644 (file)
 #include "utf8.h"
 #include "userdiff.h"
 
-static char blame_usage[] = "git blame [options] [rev-opts] [rev] [--] file";
+static char blame_usage[] = N_("git blame [options] [rev-opts] [rev] [--] file");
 
 static const char *blame_opt_usage[] = {
        blame_usage,
        "",
-       "[rev-opts] are documented in git-rev-list(1)",
+       N_("[rev-opts] are documented in git-rev-list(1)"),
        NULL
 };
 
@@ -2069,6 +2069,55 @@ static int git_blame_config(const char *var, const char *value, void *cb)
        return git_default_config(var, value, cb);
 }
 
+static void verify_working_tree_path(struct commit *work_tree, const char *path)
+{
+       struct commit_list *parents;
+
+       for (parents = work_tree->parents; parents; parents = parents->next) {
+               const unsigned char *commit_sha1 = parents->item->object.sha1;
+               unsigned char blob_sha1[20];
+               unsigned mode;
+
+               if (!get_tree_entry(commit_sha1, path, blob_sha1, &mode) &&
+                   sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
+                       return;
+       }
+       die("no such path '%s' in HEAD", path);
+}
+
+static struct commit_list **append_parent(struct commit_list **tail, const unsigned char *sha1)
+{
+       struct commit *parent;
+
+       parent = lookup_commit_reference(sha1);
+       if (!parent)
+               die("no such commit %s", sha1_to_hex(sha1));
+       return &commit_list_insert(parent, tail)->next;
+}
+
+static void append_merge_parents(struct commit_list **tail)
+{
+       int merge_head;
+       const char *merge_head_file = git_path("MERGE_HEAD");
+       struct strbuf line = STRBUF_INIT;
+
+       merge_head = open(merge_head_file, O_RDONLY);
+       if (merge_head < 0) {
+               if (errno == ENOENT)
+                       return;
+               die("cannot open '%s' for reading", merge_head_file);
+       }
+
+       while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) {
+               unsigned char sha1[20];
+               if (line.len < 40 || get_sha1_hex(line.buf, sha1))
+                       die("unknown line in '%s': %s", merge_head_file, line.buf);
+               tail = append_parent(tail, sha1);
+       }
+       close(merge_head);
+       strbuf_release(&line);
+}
+
 /*
  * Prepare a dummy commit that represents the work tree (or staged) item.
  * Note that annotating work tree item never works in the reverse.
@@ -2079,6 +2128,7 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 {
        struct commit *commit;
        struct origin *origin;
+       struct commit_list **parent_tail, *parent;
        unsigned char head_sha1[20];
        struct strbuf buf = STRBUF_INIT;
        const char *ident;
@@ -2086,20 +2136,38 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
        int size, len;
        struct cache_entry *ce;
        unsigned mode;
-
-       if (get_sha1("HEAD", head_sha1))
-               die("No such ref: HEAD");
+       struct strbuf msg = STRBUF_INIT;
 
        time(&now);
        commit = xcalloc(1, sizeof(*commit));
-       commit->parents = xcalloc(1, sizeof(*commit->parents));
-       commit->parents->item = lookup_commit_reference(head_sha1);
        commit->object.parsed = 1;
        commit->date = now;
        commit->object.type = OBJ_COMMIT;
+       parent_tail = &commit->parents;
+
+       if (!resolve_ref_unsafe("HEAD", head_sha1, 1, NULL))
+               die("no such ref: HEAD");
+
+       parent_tail = append_parent(parent_tail, head_sha1);
+       append_merge_parents(parent_tail);
+       verify_working_tree_path(commit, path);
 
        origin = make_origin(commit, path);
 
+       ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
+       strbuf_addstr(&msg, "tree 0000000000000000000000000000000000000000\n");
+       for (parent = commit->parents; parent; parent = parent->next)
+               strbuf_addf(&msg, "parent %s\n",
+                           sha1_to_hex(parent->item->object.sha1));
+       strbuf_addf(&msg,
+                   "author %s\n"
+                   "committer %s\n\n"
+                   "Version of %s from %s\n",
+                   ident, ident, path,
+                   (!contents_from ? path :
+                    (!strcmp(contents_from, "-") ? "standard input" : contents_from)));
+       commit->buffer = strbuf_detach(&msg, NULL);
+
        if (!contents_from || strcmp("-", contents_from)) {
                struct stat st;
                const char *read_from;
@@ -2136,7 +2204,6 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
        }
        else {
                /* Reading from stdin */
-               contents_from = "standard input";
                mode = 0;
                if (strbuf_read(&buf, 0, 0) < 0)
                        die_errno("failed to read from stdin");
@@ -2181,16 +2248,6 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
         */
        cache_tree_invalidate_path(active_cache_tree, path);
 
-       commit->buffer = xmalloc(400);
-       ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
-       snprintf(commit->buffer, 400,
-               "tree 0000000000000000000000000000000000000000\n"
-               "parent %s\n"
-               "author %s\n"
-               "committer %s\n\n"
-               "Version of %s from %s\n",
-               sha1_to_hex(head_sha1),
-               ident, ident, path, contents_from ? contents_from : path);
        return commit;
 }
 
@@ -2313,27 +2370,27 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
        static const char *revs_file = NULL;
        static const char *contents_from = NULL;
        static const struct option options[] = {
-               OPT_BOOLEAN(0, "incremental", &incremental, "Show blame entries as we find them, incrementally"),
-               OPT_BOOLEAN('b', NULL, &blank_boundary, "Show blank SHA-1 for boundary commits (Default: off)"),
-               OPT_BOOLEAN(0, "root", &show_root, "Do not treat root commits as boundaries (Default: off)"),
-               OPT_BOOLEAN(0, "show-stats", &show_stats, "Show work cost statistics"),
-               OPT_BIT(0, "score-debug", &output_option, "Show output score for blame entries", OUTPUT_SHOW_SCORE),
-               OPT_BIT('f', "show-name", &output_option, "Show original filename (Default: auto)", OUTPUT_SHOW_NAME),
-               OPT_BIT('n', "show-number", &output_option, "Show original linenumber (Default: off)", OUTPUT_SHOW_NUMBER),
-               OPT_BIT('p', "porcelain", &output_option, "Show in a format designed for machine consumption", OUTPUT_PORCELAIN),
-               OPT_BIT(0, "line-porcelain", &output_option, "Show porcelain format with per-line commit information", OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
-               OPT_BIT('c', NULL, &output_option, "Use the same output mode as git-annotate (Default: off)", OUTPUT_ANNOTATE_COMPAT),
-               OPT_BIT('t', NULL, &output_option, "Show raw timestamp (Default: off)", OUTPUT_RAW_TIMESTAMP),
-               OPT_BIT('l', NULL, &output_option, "Show long commit SHA1 (Default: off)", OUTPUT_LONG_OBJECT_NAME),
-               OPT_BIT('s', NULL, &output_option, "Suppress author name and timestamp (Default: off)", OUTPUT_NO_AUTHOR),
-               OPT_BIT('e', "show-email", &output_option, "Show author email instead of name (Default: off)", OUTPUT_SHOW_EMAIL),
-               OPT_BIT('w', NULL, &xdl_opts, "Ignore whitespace differences", XDF_IGNORE_WHITESPACE),
-               OPT_BIT(0, "minimal", &xdl_opts, "Spend extra cycles to find better match", XDF_NEED_MINIMAL),
-               OPT_STRING('S', NULL, &revs_file, "file", "Use revisions from <file> instead of calling git-rev-list"),
-               OPT_STRING(0, "contents", &contents_from, "file", "Use <file>'s contents as the final image"),
-               { OPTION_CALLBACK, 'C', NULL, &opt, "score", "Find line copies within and across files", PARSE_OPT_OPTARG, blame_copy_callback },
-               { OPTION_CALLBACK, 'M', NULL, &opt, "score", "Find line movements within and across files", PARSE_OPT_OPTARG, blame_move_callback },
-               OPT_CALLBACK('L', NULL, &bottomtop, "n,m", "Process only line range n,m, counting from 1", blame_bottomtop_callback),
+               OPT_BOOLEAN(0, "incremental", &incremental, N_("Show blame entries as we find them, incrementally")),
+               OPT_BOOLEAN('b', NULL, &blank_boundary, N_("Show blank SHA-1 for boundary commits (Default: off)")),
+               OPT_BOOLEAN(0, "root", &show_root, N_("Do not treat root commits as boundaries (Default: off)")),
+               OPT_BOOLEAN(0, "show-stats", &show_stats, N_("Show work cost statistics")),
+               OPT_BIT(0, "score-debug", &output_option, N_("Show output score for blame entries"), OUTPUT_SHOW_SCORE),
+               OPT_BIT('f', "show-name", &output_option, N_("Show original filename (Default: auto)"), OUTPUT_SHOW_NAME),
+               OPT_BIT('n', "show-number", &output_option, N_("Show original linenumber (Default: off)"), OUTPUT_SHOW_NUMBER),
+               OPT_BIT('p', "porcelain", &output_option, N_("Show in a format designed for machine consumption"), OUTPUT_PORCELAIN),
+               OPT_BIT(0, "line-porcelain", &output_option, N_("Show porcelain format with per-line commit information"), OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
+               OPT_BIT('c', NULL, &output_option, N_("Use the same output mode as git-annotate (Default: off)"), OUTPUT_ANNOTATE_COMPAT),
+               OPT_BIT('t', NULL, &output_option, N_("Show raw timestamp (Default: off)"), OUTPUT_RAW_TIMESTAMP),
+               OPT_BIT('l', NULL, &output_option, N_("Show long commit SHA1 (Default: off)"), OUTPUT_LONG_OBJECT_NAME),
+               OPT_BIT('s', NULL, &output_option, N_("Suppress author name and timestamp (Default: off)"), OUTPUT_NO_AUTHOR),
+               OPT_BIT('e', "show-email", &output_option, N_("Show author email instead of name (Default: off)"), OUTPUT_SHOW_EMAIL),
+               OPT_BIT('w', NULL, &xdl_opts, N_("Ignore whitespace differences"), XDF_IGNORE_WHITESPACE),
+               OPT_BIT(0, "minimal", &xdl_opts, N_("Spend extra cycles to find better match"), XDF_NEED_MINIMAL),
+               OPT_STRING('S', NULL, &revs_file, N_("file"), N_("Use revisions from <file> instead of calling git-rev-list")),
+               OPT_STRING(0, "contents", &contents_from, N_("file"), N_("Use <file>'s contents as the final image")),
+               { OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
+               { OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
+               OPT_CALLBACK('L', NULL, &bottomtop, N_("n,m"), N_("Process only line range n,m, counting from 1"), blame_bottomtop_callback),
                OPT__ABBREV(&abbrev),
                OPT_END()
        };