[PATCH v2 08/11] ref-filter: introduce prefixes for the align atom

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Introduce optional prefixes "width=" and "position=" for the align atom
so that the atom can be used as "%(align:width=<width>,position=<position>)".

Add Documetation and tests for the same.

Signed-off-by: Karthik Nayak <Karthik.188@xxxxxxxxx>
---
 Documentation/git-for-each-ref.txt |  20 +++--
 ref-filter.c                       |  13 ++-
 t/t6302-for-each-ref-filter.sh     | 162 +++++++++++++++++++++++++++++++++++++
 3 files changed, 185 insertions(+), 10 deletions(-)

diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index c6f073c..9af0f53 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -129,14 +129,18 @@ color::
 
 align::
 	Left-, middle-, or right-align the content between
-	%(align:...) and %(end). The "align:" is followed by `<width>`
-	and `<position>` in any order separated by a comma, where the
-	`<position>` is either left, right or middle, default being
-	left and `<width>` is the total length of the content with
-	alignment. If the contents length is more than the width then
-	no alignment is performed. If used with '--quote' everything
-	in between %(align:...) and %(end) is quoted, but if nested
-	then only the topmost level performs quoting.
+	%(align:...) and %(end). The "align:" is followed by
+	`width=<width>` and `position=<position>` in any order
+	separated by a comma, where the `<position>` is either left,
+	right or middle, default being left and `<width>` is the total
+	length of the content with alignment. For brevity, the
+	"width=" and/or "position=" prefixes may be omitted, and bare
+	<width> and <position> used instead.  For instance,
+	`%(align:<width>,<position>)`. If the contents length is more
+	than the width then no alignment is performed. If used with
+	'--quote' everything in between %(align:...) and %(end) is
+	quoted, but if nested then only the topmost level performs
+	quoting.
 
 In addition to the above, for commit and tag objects, the header
 field names (`tree`, `parent`, `object`, `type`, and `tag`) can
diff --git a/ref-filter.c b/ref-filter.c
index a44673c..985423b 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -96,10 +96,19 @@ static void align_atom_parser(struct used_atom *atom)
 
 	while (*s) {
 		int position;
+		buf = s[0]->buf;
 
-		if (!strtoul_ui(s[0]->buf, 10, (unsigned int *)&width))
+		if (skip_prefix(buf, "position=", &buf)) {
+			position = parse_align_position(buf);
+			if (position == -1)
+				die(_("unrecognized position:%s"), buf);
+			align->position = position;
+		} else if (skip_prefix(buf, "width=", &buf)) {
+			if (strtoul_ui(buf, 10, (unsigned int *)&width))
+				die(_("unrecognized width:%s"), buf);
+		} else if (!strtoul_ui(buf, 10, (unsigned int *)&width))
 			;
-		else if ((position = parse_align_position(s[0]->buf)) > 0)
+		else if ((position = parse_align_position(buf)) != -1)
 			align->position = position;
 		else
 			die(_("unrecognized %%(align) argument: %s"), s[0]->buf);
diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
index fe4796c..bcb6771 100755
--- a/t/t6302-for-each-ref-filter.sh
+++ b/t/t6302-for-each-ref-filter.sh
@@ -133,6 +133,168 @@ test_expect_success 'right alignment' '
 	test_cmp expect actual
 '
 
+test_expect_success 'alignment with "position" prefix' '
+	cat >expect <<-\EOF &&
+	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/side|refs/heads/side
+	|      refname is refs/odd/spot|refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|     refname is refs/tags/four|refs/tags/four
+	|      refname is refs/tags/one|refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|    refname is refs/tags/three|refs/tags/three
+	|      refname is refs/tags/two|refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:30,position=right)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with "position" prefix' '
+	cat >expect <<-\EOF &&
+	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/side|refs/heads/side
+	|      refname is refs/odd/spot|refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|     refname is refs/tags/four|refs/tags/four
+	|      refname is refs/tags/one|refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|    refname is refs/tags/three|refs/tags/three
+	|      refname is refs/tags/two|refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:position=right,30)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with "width" prefix' '
+	cat >expect <<-\EOF &&
+	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/side|refs/heads/side
+	|      refname is refs/odd/spot|refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|     refname is refs/tags/four|refs/tags/four
+	|      refname is refs/tags/one|refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|    refname is refs/tags/three|refs/tags/three
+	|      refname is refs/tags/two|refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:width=30,right)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with "width" prefix' '
+	cat >expect <<-\EOF &&
+	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/side|refs/heads/side
+	|      refname is refs/odd/spot|refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|     refname is refs/tags/four|refs/tags/four
+	|      refname is refs/tags/one|refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|    refname is refs/tags/three|refs/tags/three
+	|      refname is refs/tags/two|refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:right,width=30)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with "position" and "width" prefix' '
+	cat >expect <<-\EOF &&
+	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/side|refs/heads/side
+	|      refname is refs/odd/spot|refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|     refname is refs/tags/four|refs/tags/four
+	|      refname is refs/tags/one|refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|    refname is refs/tags/three|refs/tags/three
+	|      refname is refs/tags/two|refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:width=30,position=right)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with "position" and "width" prefix' '
+	cat >expect <<-\EOF &&
+	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/side|refs/heads/side
+	|      refname is refs/odd/spot|refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|     refname is refs/tags/four|refs/tags/four
+	|      refname is refs/tags/one|refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|    refname is refs/tags/three|refs/tags/three
+	|      refname is refs/tags/two|refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:position=right,width=30)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+# Last one wins (silently) when multiple arguments of the same type are given
+
+test_expect_success 'alignment with multiple "<width>" values' '
+	cat >expect <<-\EOF &&
+	|refname is refs/heads/master  |refs/heads/master
+	|refname is refs/heads/side    |refs/heads/side
+	|refname is refs/odd/spot      |refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|refname is refs/tags/four     |refs/tags/four
+	|refname is refs/tags/one      |refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|refname is refs/tags/three    |refs/tags/three
+	|refname is refs/tags/two      |refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:32,width=30)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with multiple "<width>" values' '
+	cat >expect <<-\EOF &&
+	|refname is refs/heads/master    |refs/heads/master
+	|refname is refs/heads/side      |refs/heads/side
+	|refname is refs/odd/spot        |refs/odd/spot
+	|refname is refs/tags/double-tag |refs/tags/double-tag
+	|refname is refs/tags/four       |refs/tags/four
+	|refname is refs/tags/one        |refs/tags/one
+	|refname is refs/tags/signed-tag |refs/tags/signed-tag
+	|refname is refs/tags/three      |refs/tags/three
+	|refname is refs/tags/two        |refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:width=30,32)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with multiple "<position>" values' '
+	cat >expect <<-\EOF &&
+	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/side|refs/heads/side
+	|      refname is refs/odd/spot|refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|     refname is refs/tags/four|refs/tags/four
+	|      refname is refs/tags/one|refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|    refname is refs/tags/three|refs/tags/three
+	|      refname is refs/tags/two|refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:width=30,position=middle,right)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'alignment with multiple "<position>" values' '
+	cat >expect <<-\EOF &&
+	| refname is refs/heads/master |refs/heads/master
+	|  refname is refs/heads/side  |refs/heads/side
+	|   refname is refs/odd/spot   |refs/odd/spot
+	|refname is refs/tags/double-tag|refs/tags/double-tag
+	|  refname is refs/tags/four   |refs/tags/four
+	|   refname is refs/tags/one   |refs/tags/one
+	|refname is refs/tags/signed-tag|refs/tags/signed-tag
+	|  refname is refs/tags/three  |refs/tags/three
+	|   refname is refs/tags/two   |refs/tags/two
+	EOF
+	git for-each-ref --format="|%(align:30,right,position=middle)refname is %(refname)%(end)|%(refname)" >actual &&
+	test_cmp expect actual
+'
+
 # Individual atoms inside %(align:...) and %(end) must not be quoted.
 
 test_expect_success 'alignment with format quote' "
-- 
2.6.4

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