Add column layout skeleton and git-column

A column option string consists of many token separated by either
a space or a  comma. A token belongs to one of three groups:

 - enabling: always, never and auto
 - layout mode: currently plain (which does not layout at all)
 - other future tuning flags

git-column can be used to pipe output to from a command that wants
column layout, but not to mess with its own output code. Simpler output
code can be changed to use column layout code directly.

Thanks-to: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/t/t9002-column.sh b/t/t9002-column.sh
new file mode 100755
index 0000000000..a7f3cd9285
--- /dev/null
+++ b/t/t9002-column.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+test_description='git column'
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	cat >lista <<\EOF
+one
+two
+three
+four
+five
+six
+seven
+eight
+nine
+ten
+eleven
+EOF
+'
+
+test_expect_success 'never' '
+	git column --indent=Z --mode=never <lista >actual &&
+	test_cmp lista actual
+'
+
+test_expect_success 'always' '
+	cat >expected <<\EOF &&
+Zone
+Ztwo
+Zthree
+Zfour
+Zfive
+Zsix
+Zseven
+Zeight
+Znine
+Zten
+Zeleven
+EOF
+	git column --indent=Z --mode=plain <lista >actual &&
+	test_cmp expected actual
+'
+
+test_done