lib-log-graph.sh: consolidate test_cmp_graph logic

Logic for comparing log graphs is duplicated across test scripts.

This patchset consolidates such logic into lib-log-graph.

Helped-by: Johannes Schindelin <[email protected]>
Signed-off-by: Abhishek Kumar <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: abhishekkumar2718

t/lib-log-graph.sh

@@ -0,0 +1,39 @@
+# Helpers shared by the test scripts for comparing log graphs.
+
+sanitize_output() {
+	sed -e 's/ *$//' \
+	    -e 's/commit [0-9a-f]*$/commit COMMIT_OBJECT_NAME/' \
+	    -e 's/Merge: [ 0-9a-f]*$/Merge: MERGE_PARENTS/' \
+	    -e 's/Merge tag.*/Merge HEADS DESCRIPTION/' \
+	    -e 's/Merge commit.*/Merge HEADS DESCRIPTION/' \
+	    -e 's/, 0 deletions(-)//' \
+	    -e 's/, 0 insertions(+)//' \
+	    -e 's/ 1 files changed, / 1 file changed, /' \
+	    -e 's/, 1 deletions(-)/, 1 deletion(-)/' \
+	    -e 's/, 1 insertions(+)/, 1 insertion(+)/' \
+	    -e 's/index [0-9a-f]*\.\.[0-9a-f]*/index BEFORE..AFTER/'
+}
+
+# Assume expected graph is in file `expect`
+test_cmp_graph_file() {
+	git log --graph "$@" >output &&
+	sanitize_output >output.trimmed <output &&
+	test_i18ncmp expect output.trimmed
+}
+
+test_cmp_graph() {
+	cat >expect &&
+	test_cmp_graph_file "$@"
+}
+
+# Assume expected graph is in file `expect.colors`
+test_cmp_colored_graph_file() {
+	git log --graph --color=always "$@" >output.colors.raw &&
+	test_decode_color <output.colors.raw | sed "s/ *\$//" >output.colors &&
+	test_cmp expect.colors output.colors
+}
+
+test_cmp_colored_graph() {
+	cat >expect.colors &&
+	test_cmp_colored_graph_file "$@"
+}