#!/bin/sh

setvar test_description = ''diff hunk fusing''

source ./test-lib.sh

proc f {
	echo $1
	setvar i = '1'
	while test $i -le $2
	{
		echo $i
		setvar i = $(expr $i + 1)
	}
	echo $3
}

proc t {
	case (#) {
	4 { setvar hunks = "$4"; setvar cmd = ""diff -U$3""}
	5 { setvar hunks = "$5"; setvar cmd = ""diff -U$3 --inter-hunk-context=$4""}
	}
	setvar label = ""$cmd, $1 common $2""
	setvar file = "f$1"
	setvar expected = "expected.$file.$3.$hunks"

	if ! test -f $file
	{
		f A $1 B >$file
		git add $file
		git commit -q -m. $file
		f X $1 Y >$file
	}

	test_expect_success "$label: count hunks ($hunks)" "
		test $(git $cmd $file | grep '^@@ ' | wc -l) = $hunks
	"

	test -f $expected &&
	test_expect_success "$label: check output" "
		git $cmd $file | grep -v '^index ' >actual &&
		test_cmp $expected actual
	"
}

cat <<< """ >expected.f1.0.1 || exit 1
diff --git a/f1 b/f1
--- a/f1
+++ b/f1
@@ -1,3 +1,3 @@
-A
+X
 1
-B
+Y
"""
>expected.f1.0.1 || exit 1
diff --git a/f1 b/f1
--- a/f1
+++ b/f1
@@ -1,3 +1,3 @@
-A
+X
 1
-B
+Y
EOF

cat <<< """ >expected.f1.0.2 || exit 1
diff --git a/f1 b/f1
--- a/f1
+++ b/f1
@@ -1 +1 @@
-A
+X
@@ -3 +3 @@ A
-B
+Y
"""
>expected.f1.0.2 || exit 1
diff --git a/f1 b/f1
--- a/f1
+++ b/f1
@@ -1 +1 @@
-A
+X
@@ -3 +3 @@ A
-B
+Y
EOF

# common lines	ctx	intrctx	hunks
t 1 line	0		2
t 1 line	0	0	2
t 1 line	0	1	1
t 1 line	0	2	1
t 1 line	1		1

t 2 lines	0		2
t 2 lines	0	0	2
t 2 lines	0	1	2
t 2 lines	0	2	1
t 2 lines	1		1

t 3 lines	1		2
t 3 lines	1	0	2
t 3 lines	1	1	1
t 3 lines	1	2	1

t 9 lines	3		2
t 9 lines	3	2	2
t 9 lines	3	3	1

test_done