commit: Show author if different from committer

That would help reassure anybody while committing other's changes.

Signed-off-by: Santi Béjar <sbejar@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-commit.c b/builtin-commit.c
index a37d8c3..4e51b9e 100644 (file)
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -47,6 +47,7 @@ static enum {
 
 static char *logfile, *force_author, *template_file;
 static char *edit_message, *use_message;
+static char *author_name, *author_email, *author_date;
 static int all, edit_flag, also, interactive, only, amend, signoff;
 static int quiet, verbose, untracked_files, no_verify, allow_empty;
 /*
@@ -395,7 +396,7 @@ static int is_a_merge(const unsigned char *sha1)
 
 static const char sign_off_header[] = "Signed-off-by: ";
 
-static void determine_author_info(struct strbuf *sb)
+static void determine_author_info(void)
 {
        char *name, *email, *date;
 
@@ -431,7 +432,9 @@ static void determine_author_info(struct strbuf *sb)
                email = xstrndup(lb + 2, rb - (lb + 2));
        }
 
-       strbuf_addf(sb, "author %s\n", fmt_ident(name, email, date, IDENT_ERROR_ON_NO_NAME));
+       author_name = name;
+       author_email = email;
+       author_date = date;
 }
 
 static int prepare_to_commit(const char *index_file, const char *prefix)
@@ -522,7 +525,12 @@ static int prepare_to_commit(const char *index_file, const char *prefix)
 
        strbuf_release(&sb);
 
+       determine_author_info();
+
        if (use_editor) {
+               char *author_ident;
+               const char *committer_ident;
+
                if (in_merge)
                        fprintf(fp,
                                "#\n"
@@ -545,6 +553,17 @@ static int prepare_to_commit(const char *index_file, const char *prefix)
                if (only_include_assumed)
                        fprintf(fp, "# %s\n", only_include_assumed);
 
+               author_ident = xstrdup(fmt_name(author_name, author_email));
+               committer_ident = fmt_name(getenv("GIT_COMMITTER_NAME"),
+                                          getenv("GIT_COMMITTER_EMAIL"));
+               if (strcmp(author_ident, committer_ident))
+                       fprintf(fp,
+                               "#\n"
+                               "# Author:    %s\n"
+                               "#\n",
+                               author_ident);
+               free(author_ident);
+
                saved_color_setting = wt_status_use_color;
                wt_status_use_color = 0;
                commitable = run_status(fp, index_file, prefix, 1);
@@ -920,7 +939,8 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
                strbuf_addf(&sb, "parent %s\n", sha1_to_hex(head_sha1));
        }
 
-       determine_author_info(&sb);
+       strbuf_addf(&sb, "author %s\n",
+                   fmt_ident(author_name, author_email, author_date, IDENT_ERROR_ON_NO_NAME));
        strbuf_addf(&sb, "committer %s\n", git_committer_info(IDENT_ERROR_ON_NO_NAME));
        if (!is_encoding_utf8(git_commit_encoding))
                strbuf_addf(&sb, "encoding %s\n", git_commit_encoding);

diff --git a/t/t7502-commit.sh b/t/t7502-commit.sh
index 284c941..0b1db40 100755 (executable)
--- a/t/t7502-commit.sh
+++ b/t/t7502-commit.sh
@@ -154,6 +154,18 @@ test_expect_success 'cleanup commit messages (strip,-F,-e)' '
 
 '
 
+echo "#
+# Author:    $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+#" >> expect
+
+test_expect_success 'author different from committer' '
+
+       echo >>negative &&
+       git commit -e -m "sample"
+       head -n 7 .git/COMMIT_EDITMSG >actual &&
+       test_cmp expect actual
+'
+
 pwd=`pwd`
 cat >> .git/FAKE_EDITOR << EOF
 #! /bin/sh