branch: add --column

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -862,6 +862,10 @@ column.ui::
 +
 	This option defaults to 'never'.
 
+column.branch::
+	Specify whether to output branch listing in `git branch` in columns.
+	See `column.ui` for details.
+
 commit.status::
 	A boolean to enable/disable inclusion of status information in the
 	commit message template when using an editor to prepare the commit

Documentation/git-branch.txt

@@ -10,6 +10,7 @@ SYNOPSIS
 [verse]
 'git branch' [--color[=<when>] | --no-color] [-r | -a]
 	[--list] [-v [--abbrev=<length> | --no-abbrev]]
+	[--column[=<options>] | --no-column]
 	[(--merged | --no-merged | --contains) [<commit>]] [<pattern>...]
 'git branch' [--set-upstream | --track | --no-track] [-l] [-f] <branchname> [<start-point>]
 'git branch' (-m | -M) [<oldbranch>] <newbranch>
@@ -107,6 +108,14 @@ OPTIONS
 	default to color output.
 	Same as `--color=never`.
 
+--column[=<options>]::
+--no-column::
+	Display branch listing in columns. See configuration variable
+	column.branch for option syntax.`--column` and `--no-column`
+	without options are equivalent to 'always' and 'never' respectively.
++
+This option is only applicable in non-verbose mode.
+
 -r::
 --remotes::
 	List or delete (if used with -d) the remote-tracking branches.

Makefile

@@ -2168,7 +2168,7 @@ builtin/prune.o builtin/reflog.o reachable.o: reachable.h
 builtin/commit.o builtin/revert.o wt-status.o: wt-status.h
 builtin/tar-tree.o archive-tar.o: tar.h
 connect.o transport.o url.o http-backend.o: url.h
-column.o help.o pager.o: column.h
+builtin/branch.o column.o help.o pager.o: column.h
 http-fetch.o http-walker.o remote-curl.o transport.o walker.o: walker.h
 http.o http-walker.o http-push.o http-fetch.o remote-curl.o: http.h url.h
 

builtin/branch.c

@@ -15,6 +15,8 @@
 #include "branch.h"
 #include "diff.h"
 #include "revision.h"
+#include "string-list.h"
+#include "column.h"
 
 static const char * const builtin_branch_usage[] = {
 	"git branch [options] [-r | -a] [--merged | --no-merged]",
@@ -53,6 +55,9 @@ static enum merge_filter {
 } merge_filter;
 static unsigned char merge_filter_ref[20];
 
+static struct string_list output = STRING_LIST_INIT_DUP;
+static unsigned int colopts;
+
 static int parse_branch_color_slot(const char *var, int ofs)
 {
 	if (!strcasecmp(var+ofs, "plain"))
@@ -70,6 +75,8 @@ static int parse_branch_color_slot(const char *var, int ofs)
 
 static int git_branch_config(const char *var, const char *value, void *cb)
 {
+	if (!prefixcmp(var, "column."))
+		return git_column_config(var, value, "branch", &colopts);
 	if (!strcmp(var, "color.branch")) {
 		branch_use_color = git_config_colorbool(var, value);
 		return 0;
@@ -474,7 +481,12 @@ static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 	else if (verbose)
 		/* " f7c0c00 [ahead 58, behind 197] vcs-svn: drop obj_pool.h" */
 		add_verbose_info(&out, item, verbose, abbrev);
-	printf("%s\n", out.buf);
+	if (column_active(colopts)) {
+		assert(!verbose && "--column and --verbose are incompatible");
+		string_list_append(&output, out.buf);
+	} else {
+		printf("%s\n", out.buf);
+	}
 	strbuf_release(&name);
 	strbuf_release(&out);
 }
@@ -727,6 +739,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 			PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
 			opt_parse_merge_filter, (intptr_t) "HEAD",
 		},
+		OPT_COLUMN(0, "column", &colopts, "list branches in columns"),
 		OPT_END(),
 	};
 
@@ -749,6 +762,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 	}
 	hashcpy(merge_filter_ref, head_sha1);
 
+
 	argc = parse_options(argc, argv, prefix, options, builtin_branch_usage,
 			     0);
 
@@ -760,12 +774,22 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 
 	if (abbrev == -1)
 		abbrev = DEFAULT_ABBREV;
+	finalize_colopts(&colopts, -1);
+	if (verbose) {
+		if (explicitly_enable_column(colopts))
+			die(_("--column and --verbose are incompatible"));
+		colopts = 0;
+	}
 
 	if (delete)
 		return delete_branches(argc, argv, delete > 1, kinds);
-	else if (list)
-		return print_ref_list(kinds, detached, verbose, abbrev,
-				      with_commit, argv);
+	else if (list) {
+		int ret = print_ref_list(kinds, detached, verbose, abbrev,
+					 with_commit, argv);
+		print_columns(&output, colopts, NULL);
+		string_list_clear(&output, 0);
+		return ret;
+	}
 	else if (edit_description) {
 		const char *branch_name;
 		struct strbuf branch_ref = STRBUF_INIT;

t/t3200-branch.sh

@@ -160,6 +160,83 @@ test_expect_success 'git branch --list -d t should fail' '
 	test_path_is_missing .git/refs/heads/t
 '
 
+test_expect_success 'git branch --column' '
+	COLUMNS=81 git branch --column=column >actual &&
+	cat >expected <<\EOF &&
+  a/b/c     bam       foo       l       * master    n         o/p       r
+  abc       bar       j/k       m/m       master2   o/o       q
+EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'git branch --column with an extremely long branch name' '
+	long=this/is/a/part/of/long/branch/name &&
+	long=z$long/$long/$long/$long &&
+	test_when_finished "git branch -d $long" &&
+	git branch $long &&
+	COLUMNS=80 git branch --column=column >actual &&
+	cat >expected <<EOF &&
+  a/b/c
+  abc
+  bam
+  bar
+  foo
+  j/k
+  l
+  m/m
+* master
+  master2
+  n
+  o/o
+  o/p
+  q
+  r
+  $long
+EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'git branch with column.*' '
+	git config column.ui column &&
+	git config column.branch "dense" &&
+	COLUMNS=80 git branch >actual &&
+	git config --unset column.branch &&
+	git config --unset column.ui &&
+	cat >expected <<\EOF &&
+  a/b/c   bam   foo   l   * master    n     o/p   r
+  abc     bar   j/k   m/m   master2   o/o   q
+EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'git branch --column -v should fail' '
+	test_must_fail git branch --column -v
+'
+
+test_expect_success 'git branch -v with column.ui ignored' '
+	git config column.ui column &&
+	COLUMNS=80 git branch -v | cut -c -10 | sed "s/ *$//" >actual &&
+	git config --unset column.ui &&
+	cat >expected <<\EOF &&
+  a/b/c
+  abc
+  bam
+  bar
+  foo
+  j/k
+  l
+  m/m
+* master
+  master2
+  n
+  o/o
+  o/p
+  q
+  r
+EOF
+	test_cmp expected actual
+'
+
 mv .git/config .git/config-saved
 
 test_expect_success 'git branch -m q q2 without config should succeed' '