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[PATCH] log: add %S option (like --source) to log --format




Make it possible to write for example

        git log --format="%H,%S"

where the %S at the end is a new placeholder that prints out the ref
(tag/branch) for each commit.

Using %d might seem like an alternative but it only shows the ref for
the last commit in the branch.

This change is based on a question from Stack Overflow:
https://stackoverflow.com/questions/12712775/git-get-source-information-in-format
---
 Documentation/pretty-formats.txt |  2 ++
 builtin/log.c                    |  2 +-
 log-tree.c                       |  1 +
 pretty.c                         | 10 +++++++
 t/t4205-log-pretty-formats.sh    | 50 ++++++++++++++++++++++++++++++++
 5 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index 417b638cd..acfe7e0a4 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -104,6 +104,8 @@ The placeholders are:

 - '%H': commit hash
 - '%h': abbreviated commit hash
+- '%S': ref name given on the command line by which the commit was reached
+  (like `git log --source`)
 - '%T': tree hash
 - '%t': abbreviated tree hash
 - '%P': parent hashes
diff --git a/builtin/log.c b/builtin/log.c
index e8e51068b..a314ea2b6 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -203,7 +203,7 @@ static void cmd_log_init_finish(int argc, const
char **argv, const char *prefix,
         rev->diffopt.filter || rev->diffopt.flags.follow_renames)
         rev->always_show_header = 0;

-    if (source) {
+    if (source || (rev->pretty_given && rev->commit_format ==
CMIT_FMT_USERFORMAT)) {
         init_revision_sources(&revision_sources);
         rev->sources = &revision_sources;
     }
diff --git a/log-tree.c b/log-tree.c
index 10680c139..3cb14256e 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -700,6 +700,7 @@ void show_log(struct rev_info *opt)
     ctx.color = opt->diffopt.use_color;
     ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
     ctx.output_encoding = get_log_output_encoding();
+    ctx.rev = opt;
     if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
         ctx.from_ident = &opt->from_ident;
     if (opt->graph)
diff --git a/pretty.c b/pretty.c
index b83a3ecd2..b1774acad 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1084,6 +1084,7 @@ static size_t format_commit_one(struct strbuf
*sb, /* in UTF-8 */
     struct commit_list *p;
     const char *arg;
     int ch;
+    char **slot;

     /* these are independent of the commit */
     switch (placeholder[0]) {
@@ -1149,6 +1150,15 @@ static size_t format_commit_one(struct strbuf
*sb, /* in UTF-8 */
         parse_object(the_repository, &commit->object.oid);

     switch (placeholder[0]) {
+    case 'S':        /* tag/branch like --source */
+        slot = revision_sources_at(c->pretty_ctx->rev->sources, commit);
+        if (slot && *slot) {
+            strbuf_addstr(sb, *slot);
+            return 1;
+        } else {
+            die(_("failed to get info for %%S"));
+            return 0;
+        }
     case 'H':        /* commit hash */
         strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
         strbuf_addstr(sb, oid_to_hex(&commit->object.oid));
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 978a8a66f..7df8c3d4e 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -621,4 +621,54 @@ test_expect_success 'trailer parsing not fooled
by --- line' '
     test_cmp expect actual
 '

+test_expect_success 'set up %S tests' '
+    git checkout --orphan source-a &&
+    test_commit one &&
+    test_commit two &&
+    git checkout -b source-b HEAD^ &&
+    test_commit three
+'
+
+test_expect_success 'log --format=%S paints branch names' '
+    cat >expect <<-\EOF &&
+    source-b
+    source-a
+    source-b
+    EOF
+    git log --format=%S source-a source-b >actual &&
+    test_cmp expect actual
+'
+
+test_expect_success 'log --format=%S paints tag names' '
+    git tag -m tagged source-tag &&
+    cat >expect <<-\EOF &&
+    source-tag
+    source-a
+    source-tag
+    EOF
+    git log --format=%S source-tag source-a >actual &&
+    test_cmp expect actual
+'
+
+test_expect_success 'log --format=%S paints symmetric ranges' '
+    cat >expect <<-\EOF &&
+    source-b
+    source-a
+    EOF
+    git log --format=%S source-a...source-b >actual &&
+    test_cmp expect actual
+'
+
+test_expect_success '%S in git log --format works with other
placeholders (part 1)' '
+    git log --format="source-b %h" source-b >expect &&
+    git log --format="%S %h" source-b >actual &&
+    test_cmp expect actual
+'
+
+test_expect_success '%S in git log --format works with other
placeholders (part 2)' '
+    git log --format="%h source-b" source-b >expect &&
+    git log --format="%h %S" source-b >actual &&
+    test_cmp expect actual
+'
+
 test_done
-- 
2.19.1