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From: Jonathan Tan <jonathantanmy@google.com>
To: Stefan Beller <sbeller@google.com>, git@vger.kernel.org
Cc: peff@peff.net, gitster@pobox.com, mhagger@alum.mit.edu,
	jrnieder@gmail.com, bmwill@google.com
Subject: Re: [PATCH 08/19] diff.c: convert builtin_diff to use emit_line_*
Date: Mon, 15 May 2017 11:42:10 -0700	[thread overview]
Message-ID: <c88f7f39-b0c1-d437-3786-6c470bfe7d00@google.com> (raw)
In-Reply-To: <20170514040117.25865-9-sbeller@google.com>

On 05/13/2017 09:01 PM, Stefan Beller wrote:
> In a later patch, I want to propose an option to detect&color
> moved lines in a diff, which cannot be done in a one-pass over
> the diff. Instead we need to go over the whole diff twice,
> because we cannot detect the first line of the two corresponding
> lines (+ and -) that got moved.
>
> So to prepare the diff machinery for two pass algorithms
> (i.e. buffer it all up and then operate on the result),
> move all emissions to places, such that the only emitting
> function is emit_line_0.
>
> This covers builtin_diff.
>
> Signed-off-by: Stefan Beller <sbeller@google.com>
> ---
>  diff.c | 43 ++++++++++++++++++++++++++-----------------
>  1 file changed, 26 insertions(+), 17 deletions(-)
>
> diff --git a/diff.c b/diff.c
> index 93343a9ccc..8e00010bf4 100644
> --- a/diff.c
> +++ b/diff.c
> @@ -1293,8 +1293,9 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
>  	o->found_changes = 1;
>
>  	if (ecbdata->header) {
> -		fprintf(o->file, "%s", ecbdata->header->buf);
> -		strbuf_reset(ecbdata->header);
> +		emit_line(o, NULL, NULL,
> +			  ecbdata->header->buf, ecbdata->header->len);
> +		strbuf_release(ecbdata->header);
>  		ecbdata->header = NULL;
>  	}
>
> @@ -2407,7 +2408,7 @@ static void builtin_diff(const char *name_a,
>  	b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
>  	lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
>  	lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
> -	strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
> +	strbuf_addf(&header, "%sdiff --git %s %s%s\n", meta, a_one, b_two, reset);
>  	if (lbl[0][0] == '/') {
>  		/* /dev/null */
>  		strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
> @@ -2439,7 +2440,7 @@ static void builtin_diff(const char *name_a,
>  		if (complete_rewrite &&
>  		    (textconv_one || !diff_filespec_is_binary(one)) &&
>  		    (textconv_two || !diff_filespec_is_binary(two))) {
> -			fprintf(o->file, "%s", header.buf);
> +			emit_line(o, NULL, NULL, header.buf, header.len);
>  			strbuf_reset(&header);
>  			emit_rewrite_diff(name_a, name_b, one, two,
>  						textconv_one, textconv_two, o);
> @@ -2449,7 +2450,8 @@ static void builtin_diff(const char *name_a,
>  	}
>
>  	if (o->irreversible_delete && lbl[1][0] == '/') {
> -		fprintf(o->file, "%s", header.buf);
> +		if (header.len)
> +			emit_line(o, NULL, NULL, header.buf, header.len);

This used to unconditionally output diff_line_prefix(0), but now outputs 
it only if the non-prefix part is blank. Is that expected? (Same 
comments below.)

>  		strbuf_reset(&header);
>  		goto free_ab_and_return;
>  	} else if (!DIFF_OPT_TST(o, TEXT) &&
> @@ -2459,13 +2461,16 @@ static void builtin_diff(const char *name_a,
>  		    S_ISREG(one->mode) && S_ISREG(two->mode) &&
>  		    !DIFF_OPT_TST(o, BINARY)) {
>  			if (!oidcmp(&one->oid, &two->oid)) {
> -				if (must_show_header)
> -					fprintf(o->file, "%s", header.buf);
> +				if (must_show_header && header.len)
> +					emit_line(o, NULL, NULL,
> +						  header.buf, header.len);
>  				goto free_ab_and_return;
>  			}
> -			fprintf(o->file, "%s", header.buf);
> -			fprintf(o->file, "%sBinary files %s and %s differ\n",
> -				line_prefix, lbl[0], lbl[1]);
> +			if (header.len)
> +				emit_line(o, NULL, NULL,
> +					  header.buf, header.len);
> +			emit_line_fmt(o, 0, 0, "Binary files %s and %s differ\n",
> +				      lbl[0], lbl[1]);
>  			goto free_ab_and_return;
>  		}
>  		if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
> @@ -2473,17 +2478,21 @@ static void builtin_diff(const char *name_a,
>  		/* Quite common confusing case */
>  		if (mf1.size == mf2.size &&
>  		    !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
> -			if (must_show_header)
> -				fprintf(o->file, "%s", header.buf);
> +			if (must_show_header && header.len)
> +				emit_line(o, NULL, NULL,
> +					  header.buf, header.len);
>  			goto free_ab_and_return;
>  		}
> -		fprintf(o->file, "%s", header.buf);
> +		if (header.len)
> +			emit_line(o, NULL, NULL,
> +				  header.buf, header.len);
>  		strbuf_reset(&header);
>  		if (DIFF_OPT_TST(o, BINARY))
>  			emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
>  		else
> -			fprintf(o->file, "%sBinary files %s and %s differ\n",
> -				line_prefix, lbl[0], lbl[1]);
> +			emit_line_fmt(o, NULL, NULL,
> +				      "Binary files %s and %s differ\n",
> +				      lbl[0], lbl[1]);
>  		o->found_changes = 1;
>  	} else {
>  		/* Crazy xdl interfaces.. */
> @@ -2494,8 +2503,8 @@ static void builtin_diff(const char *name_a,
>  		struct emit_callback ecbdata;
>  		const struct userdiff_funcname *pe;
>
> -		if (must_show_header) {
> -			fprintf(o->file, "%s", header.buf);
> +		if (must_show_header && header.len) {
> +			emit_line(o, NULL, NULL, header.buf, header.len);
>  			strbuf_reset(&header);
>  		}
>
>

  reply	other threads:[~2017-05-15 18:42 UTC|newest]

Thread overview: 128+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-14  4:00 [RFC PATCH 00/19] Diff machine: highlight moved lines Stefan Beller
2017-05-14  4:00 ` [PATCH 01/19] diff: readability fix Stefan Beller
2017-05-14  4:01 ` [PATCH 02/19] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-15  6:48   ` Junio C Hamano
2017-05-15 16:13     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 03/19] diff.c: drop 'nofirst' from emit_line_0 Stefan Beller
2017-05-15 18:26   ` Jonathan Tan
2017-05-15 18:33     ` Stefan Beller
2017-05-16 16:05       ` Jonathan Tan
2017-05-15 19:22   ` Brandon Williams
2017-05-15 19:35     ` Stefan Beller
2017-05-15 19:45       ` Brandon Williams
2017-05-14  4:01 ` [PATCH 04/19] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-14  4:01 ` [PATCH 05/19] diff.c: emit_line_0 can handle no color setting Stefan Beller
2017-05-15 18:31   ` Jonathan Tan
2017-05-15 22:11     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 06/19] diff: add emit_line_fmt Stefan Beller
2017-05-15 19:31   ` Brandon Williams
2017-05-14  4:01 ` [PATCH 07/19] diff.c: convert fn_out_consume to use emit_line_* Stefan Beller
2017-05-16  1:00   ` Junio C Hamano
2017-05-16  1:05     ` Junio C Hamano
2017-05-16 16:23       ` Stefan Beller
2017-05-14  4:01 ` [PATCH 08/19] diff.c: convert builtin_diff " Stefan Beller
2017-05-15 18:42   ` Jonathan Tan [this message]
2017-05-14  4:01 ` [PATCH 09/19] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-14  4:01 ` [PATCH 10/19] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-15 19:09   ` Jonathan Tan
2017-05-15 19:31     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 11/19] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-14  4:01 ` [PATCH 12/19] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-14  4:01 ` [PATCH 13/19] diff.c: convert show_stats " Stefan Beller
2017-05-14  4:01 ` [PATCH 14/19] diff.c: convert word diffing " Stefan Beller
2017-05-15 22:40   ` Jonathan Tan
2017-05-15 23:12     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 15/19] diff.c: convert diff_flush " Stefan Beller
2017-05-15 20:21   ` Jonathan Tan
2017-05-15 22:08     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 16/19] diff.c: convert diff_summary " Stefan Beller
2017-05-14  4:01 ` [PATCH 17/19] diff.c: factor out emit_line_ws for coloring whitespaces Stefan Beller
2017-05-14  4:01 ` [PATCH 18/19] diff: buffer all output if asked to Stefan Beller
2017-05-14  4:06   ` Jeff King
2017-05-14  4:25     ` Stefan Beller
2017-05-16  4:14   ` Jonathan Tan
2017-05-16 16:42     ` Stefan Beller
2017-05-14  4:01 ` [PATCH 19/19] diff.c: color moved lines differently Stefan Beller
2017-05-15 22:42   ` Brandon Williams
2017-05-16  4:34   ` Jonathan Tan
2017-05-16 12:31   ` Jeff King
2017-05-15 12:43 ` [RFC PATCH 00/19] Diff machine: highlight moved lines Junio C Hamano
2017-05-15 16:33   ` Stefan Beller
2017-05-17  2:58 ` [PATCHv2 00/20] " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 01/20] diff: readability fix Stefan Beller
2017-05-17  2:58   ` [PATCHv2 02/20] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-17  2:58   ` [PATCHv2 03/20] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-17  2:58   ` [PATCHv2 04/20] diff.c: teach emit_line_0 to accept sign parameter Stefan Beller
2017-05-17  2:58   ` [PATCHv2 05/20] diff.c: emit_line_0 can handle no color setting Stefan Beller
2017-05-17  2:58   ` [PATCHv2 06/20] diff.c: emit_line_0 takes parameter whether to output line prefix Stefan Beller
2017-05-17  2:58   ` [PATCHv2 07/20] diff.c: inline emit_line_0 into emit_line Stefan Beller
2017-05-17  2:58   ` [PATCHv2 08/20] diff.c: convert fn_out_consume to use emit_line Stefan Beller
2017-05-17  2:58   ` [PATCHv2 09/20] diff.c: convert builtin_diff to use emit_line_* Stefan Beller
2017-05-17  2:58   ` [PATCHv2 10/20] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 11/20] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-17  5:03     ` Junio C Hamano
2017-05-17 21:16       ` Stefan Beller
2017-05-18  3:35     ` Junio C Hamano
2017-05-17  2:58   ` [PATCHv2 12/20] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-17  5:19     ` Junio C Hamano
2017-05-17 21:05       ` Stefan Beller
2017-05-18  3:25         ` Junio C Hamano
2017-05-18 17:12           ` Stefan Beller
2017-05-20  4:50             ` Junio C Hamano
2017-05-20 22:00               ` Stefan Beller
2017-05-17  2:58   ` [PATCHv2 13/20] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-17  2:58   ` [PATCHv2 14/20] diff.c: convert show_stats " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 15/20] diff.c: convert word diffing " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 16/20] diff.c: convert diff_flush " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 17/20] diff.c: convert diff_summary " Stefan Beller
2017-05-17  2:58   ` [PATCHv2 18/20] diff.c: emit_line includes whitespace highlighting Stefan Beller
2017-05-17  2:58   ` [PATCHv2 19/20] diff: buffer all output if asked to Stefan Beller
2017-05-17  2:58   ` [PATCHv2 20/20] diff.c: color moved lines differently Stefan Beller
2017-05-18 19:37   ` [PATCHv3 00/20] Diff machine: highlight moved lines Stefan Beller
2017-05-18 19:37     ` [PATCHv3 01/20] diff: readability fix Stefan Beller
2017-05-18 19:37     ` [PATCHv3 02/20] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-18 19:37     ` [PATCHv3 03/20] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-18 19:37     ` [PATCHv3 04/20] diff.c: teach emit_line_0 to accept sign parameter Stefan Beller
2017-05-18 23:33       ` Jonathan Tan
2017-05-22 23:36         ` Stefan Beller
2017-05-18 19:37     ` [PATCHv3 05/20] diff.c: emit_line_0 can handle no color setting Stefan Beller
2017-05-18 19:37     ` [PATCHv3 06/20] diff.c: emit_line_0 takes parameter whether to output line prefix Stefan Beller
2017-05-18 19:37     ` [PATCHv3 07/20] diff.c: inline emit_line_0 into emit_line Stefan Beller
2017-05-18 19:37     ` [PATCHv3 08/20] diff.c: convert fn_out_consume to use emit_line Stefan Beller
2017-05-18 19:37     ` [PATCHv3 09/20] diff.c: convert builtin_diff to use emit_line_* Stefan Beller
2017-05-18 19:37     ` [PATCHv3 10/20] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 11/20] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 12/20] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-18 19:37     ` [PATCHv3 13/20] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-18 19:37     ` [PATCHv3 14/20] diff.c: convert show_stats " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 15/20] diff.c: convert word diffing " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 16/20] diff.c: convert diff_flush " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 17/20] diff.c: convert diff_summary " Stefan Beller
2017-05-18 19:37     ` [PATCHv3 18/20] diff.c: emit_line includes whitespace highlighting Stefan Beller
2017-05-18 19:37     ` [PATCHv3 19/20] diff: buffer all output if asked to Stefan Beller
2017-05-18 19:37     ` [PATCHv3 20/20] diff.c: color moved lines differently Stefan Beller
2017-05-19 18:23       ` Jonathan Tan
2017-05-19 18:40         ` Stefan Beller
2017-05-19 19:34           ` Jonathan Tan
2017-05-23  2:40     ` [PATCHv4 00/17] Diff machine: highlight moved lines Stefan Beller
2017-05-23  2:40       ` [PATCHv4 01/17] diff: readability fix Stefan Beller
2017-05-23  2:40       ` [PATCHv4 02/17] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-23  2:40       ` [PATCHv4 03/17] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-23  2:40       ` [PATCHv4 04/17] diff: introduce more flexible emit function Stefan Beller
2017-05-23  2:40       ` [PATCHv4 05/17] diff.c: convert fn_out_consume to use emit_line Stefan Beller
2017-05-23  2:40       ` [PATCHv4 06/17] diff.c: convert builtin_diff to use emit_line_* Stefan Beller
2017-05-23  2:40       ` [PATCHv4 07/17] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 08/17] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 09/17] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-23  5:59         ` Junio C Hamano
2017-05-23 18:14           ` Stefan Beller
2017-05-23  2:40       ` [PATCHv4 10/17] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-23  2:40       ` [PATCHv4 11/17] diff.c: convert show_stats " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 12/17] diff.c: convert word diffing " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 13/17] diff.c: convert diff_flush " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 14/17] diff.c: convert diff_summary " Stefan Beller
2017-05-23  2:40       ` [PATCHv4 15/17] diff.c: emit_line includes whitespace highlighting Stefan Beller
2017-05-23  2:40       ` [PATCHv4 16/17] diff: buffer all output if asked to Stefan Beller
2017-05-23  2:40       ` [PATCHv4 17/17] diff.c: color moved lines differently Stefan Beller
2017-05-27  1:04       ` [PATCHv4 00/17] Diff machine: highlight moved lines Jacob Keller
2017-05-30 21:38         ` Stefan Beller

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