rev-list: add option for --pretty=format without header

In general, we encourage users to use plumbing commands, like git
rev-list, over porcelain commands, like git log, when scripting.
However, git rev-list has one glaring problem that prevents it from
being used in certain cases: when --pretty is used with a custom format,
it always prints out a line containing "commit" and the object ID.  This
makes it unsuitable for many scripting needs, and forces users to use
git log instead.

While we can't change this behavior for backwards compatibility, we can
add an option to suppress this behavior, so let's do so, and call it
"--no-commit-header".  Additionally, add the corresponding positive
option to switch it back on.

Note that this option doesn't affect the built-in formats, only custom
formats.  This is exactly the same behavior as users already have from
git log and is what most users will be used to.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index 5bf2a85..23388f3 100644 (file)
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -1064,6 +1064,14 @@ ifdef::git-rev-list[]
 --header::
        Print the contents of the commit in raw-format; each record is
        separated with a NUL character.
+
+--no-commit-header::
+       Suppress the header line containing "commit" and the object ID printed before
+       the specified format.  This has no effect on the built-in formats; only custom
+       formats are affected.
+
+--commit-header::
+       Overrides a previous `--no-commit-header`.
 endif::git-rev-list[]
 
 --parents::

diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index 7677b1a..36cb909 100644 (file)
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -127,13 +127,15 @@ static void show_commit(struct commit *commit, void *data)
        if (info->header_prefix)
                fputs(info->header_prefix, stdout);
 
-       if (!revs->graph)
-               fputs(get_revision_mark(revs, commit), stdout);
-       if (revs->abbrev_commit && revs->abbrev)
-               fputs(find_unique_abbrev(&commit->object.oid, revs->abbrev),
-                     stdout);
-       else
-               fputs(oid_to_hex(&commit->object.oid), stdout);
+       if (revs->include_header) {
+               if (!revs->graph)
+                       fputs(get_revision_mark(revs, commit), stdout);
+               if (revs->abbrev_commit && revs->abbrev)
+                       fputs(find_unique_abbrev(&commit->object.oid, revs->abbrev),
+                             stdout);
+               else
+                       fputs(oid_to_hex(&commit->object.oid), stdout);
+       }
        if (revs->print_parents) {
                struct commit_list *parents = commit->parents;
                while (parents) {
@@ -153,7 +155,7 @@ static void show_commit(struct commit *commit, void *data)
        show_decorations(revs, commit);
        if (revs->commit_format == CMIT_FMT_ONELINE)
                putchar(' ');
-       else
+       else if (revs->include_header)
                putchar('\n');
 
        if (revs->verbose_header) {
@@ -512,6 +514,7 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
        repo_init_revisions(the_repository, &revs, prefix);
        revs.abbrev = DEFAULT_ABBREV;
        revs.commit_format = CMIT_FMT_UNSPECIFIED;
+       revs.include_header = 1;
 
        /*
         * Scan the argument list before invoking setup_revisions(), so that we
@@ -627,6 +630,16 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
                        continue;
                }
 
+               if (!strcmp(arg, ("--commit-header"))) {
+                       revs.include_header = 1;
+                       continue;
+               }
+
+               if (!strcmp(arg, ("--no-commit-header"))) {
+                       revs.include_header = 0;
+                       continue;
+               }
+
                if (!strcmp(arg, "--disk-usage")) {
                        show_disk_usage = 1;
                        info.flags |= REV_LIST_QUIET;
@@ -636,10 +649,12 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
                usage(rev_list_usage);
 
        }
+       if (revs.commit_format != CMIT_FMT_USERFORMAT)
+               revs.include_header = 1;
        if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
                /* The command line has a --pretty  */
                info.hdr_termination = '\n';
-               if (revs.commit_format == CMIT_FMT_ONELINE)
+               if (revs.commit_format == CMIT_FMT_ONELINE || !revs.include_header)
                        info.header_prefix = "";
                else
                        info.header_prefix = "commit ";

diff --git a/revision.h b/revision.h
index 17698cb..7464434 100644 (file)
--- a/revision.h
+++ b/revision.h
@@ -215,7 +215,8 @@ struct rev_info {
                        missing_newline:1,
                        date_mode_explicit:1,
                        preserve_subject:1,
-                       encode_email_headers:1;
+                       encode_email_headers:1,
+                       include_header:1;
        unsigned int    disable_stdin:1;
        /* --show-linear-break */
        unsigned int    track_linear:1,

diff --git a/t/t6006-rev-list-format.sh b/t/t6006-rev-list-format.sh
index 35a2f62..41d0ca0 100755 (executable)
--- a/t/t6006-rev-list-format.sh
+++ b/t/t6006-rev-list-format.sh
@@ -41,22 +41,59 @@ test_expect_success 'setup' '
        echo "$added_iso88591" | git commit -F - &&
        head1=$(git rev-parse --verify HEAD) &&
        head1_short=$(git rev-parse --verify --short $head1) &&
+       head1_short4=$(git rev-parse --verify --short=4 $head1) &&
        tree1=$(git rev-parse --verify HEAD:) &&
        tree1_short=$(git rev-parse --verify --short $tree1) &&
        echo "$changed" > foo &&
        echo "$changed_iso88591" | git commit -a -F - &&
        head2=$(git rev-parse --verify HEAD) &&
        head2_short=$(git rev-parse --verify --short $head2) &&
+       head2_short4=$(git rev-parse --verify --short=4 $head2) &&
        tree2=$(git rev-parse --verify HEAD:) &&
        tree2_short=$(git rev-parse --verify --short $tree2) &&
        git config --unset i18n.commitEncoding
 '
 
-# usage: test_format name format_string [failure] <expected_output
+# usage: test_format [argument...] name format_string [failure] <expected_output
 test_format () {
+       local args=
+       while true
+       do
+               case "$1" in
+               --*)
+                       args="$args $1"
+                       shift;;
+               *)
+                       break;;
+               esac
+       done
        cat >expect.$1
        test_expect_${3:-success} "format $1" "
-               git rev-list --pretty=format:'$2' main >output.$1 &&
+               git rev-list $args --pretty=format:'$2' main >output.$1 &&
+               test_cmp expect.$1 output.$1
+       "
+}
+
+# usage: test_pretty [argument...] name format_name [failure] <expected_output
+test_pretty () {
+       local args=
+       while true
+       do
+               case "$1" in
+               --*)
+                       args="$args $1"
+                       shift;;
+               *)
+                       break;;
+               esac
+       done
+       cat >expect.$1
+       test_expect_${3:-success} "pretty $1 (without --no-commit-header)" "
+               git rev-list $args --pretty='$2' main >output.$1 &&
+               test_cmp expect.$1 output.$1
+       "
+       test_expect_${3:-success} "pretty $1 (with --no-commit-header)" "
+               git rev-list $args --no-commit-header --pretty='$2' main >output.$1 &&
                test_cmp expect.$1 output.$1
        "
 }
@@ -93,6 +130,20 @@ $head1
 $head1_short
 EOF
 
+test_format --no-commit-header hash-no-header %H%n%h <<EOF
+$head2
+$head2_short
+$head1
+$head1_short
+EOF
+
+test_format --abbrev-commit --abbrev=0 --no-commit-header hash-no-header-abbrev %H%n%h <<EOF
+$head2
+$head2_short4
+$head1
+$head1_short4
+EOF
+
 test_format tree %T%n%t <<EOF
 commit $head2
 $tree2
@@ -181,6 +232,31 @@ $added
 
 EOF
 
+test_format --no-commit-header raw-body-no-header %B <<EOF
+$changed
+
+$added
+
+EOF
+
+test_pretty oneline oneline <<EOF
+$head2 $changed
+$head1 $added
+EOF
+
+test_pretty short short <<EOF
+commit $head2
+Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+
+    $changed
+
+commit $head1
+Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+
+    $added
+
+EOF
+
 test_expect_success 'basic colors' '
        cat >expect <<-EOF &&
        commit $head2