Re: [PATCH 6/7] diff.c: decouple white space treatment from move detection algorithm

[Jonathan Tan <jonathantanmy@google.com>]

On Tue, 24 Apr 2018 14:03:29 -0700
Stefan Beller <sbeller@google.com> wrote:

> As we change the default, we'll adjust the tests.

This statement is probably better written as:

  In some existing tests, options like --ignore-space-at-eol were used
  to control the color of the output. They have been updated to use
  options like --color-moved-ignore-space-at-eol instead.

> +	unsigned flags = diffopt->color_moved_ws_handling
> +			 & XDF_WHITESPACE_FLAGS;

No need for "& XDF_WHITESPACE_FLAGS".

> +	unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;

Same here.

> @@ -214,6 +214,7 @@ struct diff_options {
>  	} color_moved;
>  	#define COLOR_MOVED_DEFAULT COLOR_MOVED_ZEBRA
>  	#define COLOR_MOVED_MIN_ALNUM_COUNT 20
> +	int color_moved_ws_handling;
>  };

Should the "int" be "unsigned"? I noticed that the flag-like xdl_opts is
signed, but I think it's better for flags to be unsigned. Also, document
what this stores. (And also, I would limit the bits.)

> +test_expect_success 'only move detection ignores white spaces' '
> +	git reset --hard &&
> +	q_to_tab <<-\EOF >text.txt &&
> +		a long line to exceed per-line minimum
> +		another long line to exceed per-line minimum
> +		original file
> +	EOF
> +	git add text.txt &&
> +	git commit -m "add text" &&
> +	q_to_tab <<-\EOF >text.txt &&
> +		Qa long line to exceed per-line minimum
> +		Qanother long line to exceed per-line minimum
> +		new file
> +	EOF
> +
> +	# Make sure we get a different diff using -w
> +	git diff --color --color-moved -w \
> +		--color-moved-no-ignore-all-space \
> +		--color-moved-no-ignore-space-change \
> +		--color-moved-no-ignore-space-at-eol |
> +		grep -v "index" |
> +		test_decode_color >actual &&
> +	q_to_tab <<-\EOF >expected &&
> +	<BOLD>diff --git a/text.txt b/text.txt<RESET>
> +	<BOLD>--- a/text.txt<RESET>
> +	<BOLD>+++ b/text.txt<RESET>
> +	<CYAN>@@ -1,3 +1,3 @@<RESET>
> +	 Qa long line to exceed per-line minimum<RESET>
> +	 Qanother long line to exceed per-line minimum<RESET>
> +	<RED>-original file<RESET>
> +	<GREEN>+<RESET><GREEN>new file<RESET>
> +	EOF
> +	test_cmp expected actual &&
> +
> +	# And now ignoring white space only in the move detection
> +	git diff --color --color-moved \
> +		--color-moved-ignore-all-space \
> +		--color-moved-ignore-space-change \
> +		--color-moved-ignore-space-at-eol |
> +		grep -v "index" |
> +		test_decode_color >actual &&
> +	q_to_tab <<-\EOF >expected &&
> +	<BOLD>diff --git a/text.txt b/text.txt<RESET>
> +	<BOLD>--- a/text.txt<RESET>
> +	<BOLD>+++ b/text.txt<RESET>
> +	<CYAN>@@ -1,3 +1,3 @@<RESET>
> +	<BOLD;MAGENTA>-a long line to exceed per-line minimum<RESET>
> +	<BOLD;MAGENTA>-another long line to exceed per-line minimum<RESET>
> +	<RED>-original file<RESET>
> +	<BOLD;YELLOW>+<RESET>Q<BOLD;YELLOW>a long line to exceed per-line minimum<RESET>
> +	<BOLD;YELLOW>+<RESET>Q<BOLD;YELLOW>another long line to exceed per-line minimum<RESET>
> +	<GREEN>+<RESET><GREEN>new file<RESET>
> +	EOF
> +	test_cmp expected actual
>  '

I know I suggested "per-line minimum", but I don't think there is one -
I think we only have a per-block minimum. Maybe delete "per-line" in
each of the lines.