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From: Stefan Beller <sbeller@google.com>
To: gitster@pobox.com
Cc: git@vger.kernel.org, bmwill@google.com, jrnieder@gmail.com,
	jonathantanmy@google.com, peff@peff.net, mhagger@alum.mit.edu,
	Stefan Beller <sbeller@google.com>
Subject: [PATCHv5 05/17] diff.c: convert fn_out_consume to use emit_line
Date: Wed, 24 May 2017 14:40:24 -0700	[thread overview]
Message-ID: <20170524214036.29623-6-sbeller@google.com> (raw)
In-Reply-To: <20170524214036.29623-1-sbeller@google.com>

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.

This covers the parts of fn_out_consume.  In the next
patches we'll convert more functions that want to emit
formatted output, so we'd want to have a formatted emit
function. Add it here.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 diff.c | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/diff.c b/diff.c
index 3569857818..8186289734 100644
--- a/diff.c
+++ b/diff.c
@@ -547,6 +547,21 @@ static void emit_line(struct diff_options *o, const char *set, const char *reset
 		fputc('\n', file);
 }
 
+static void emit_line_fmt(struct diff_options *o,
+			  const char *set, const char *reset,
+			  int add_line_prefix,
+			  const char *fmt, ...)
+{
+	struct strbuf sb = STRBUF_INIT;
+	va_list ap;
+	va_start(ap, fmt);
+	strbuf_vaddf(&sb, fmt, ap);
+	va_end(ap);
+
+	emit_line(o, set, reset, add_line_prefix, 0, sb.buf, sb.len);
+	strbuf_release(&sb);
+}
+
 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
 {
 	if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
@@ -1270,7 +1285,6 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
 	const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
 	const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
 	struct diff_options *o = ecbdata->opt;
-	const char *line_prefix = diff_line_prefix(o);
 
 	o->found_changes = 1;
 
@@ -1282,14 +1296,12 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
 
 	if (ecbdata->label_path[0]) {
 		const char *name_a_tab, *name_b_tab;
-
 		name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
 		name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
-
-		fprintf(o->file, "%s%s--- %s%s%s\n",
-			line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
-		fprintf(o->file, "%s%s+++ %s%s%s\n",
-			line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
+		emit_line_fmt(o, meta, reset, 1, "--- %s%s\n",
+			      ecbdata->label_path[0], name_a_tab);
+		emit_line_fmt(o, meta, reset, 1, "+++ %s%s\n",
+			      ecbdata->label_path[1], name_b_tab);
 		ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
 	}
 
@@ -1330,7 +1342,7 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
 		diff_words_flush(ecbdata);
 		if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
 			emit_line(o, context, reset, 1, 0, line, len);
-			fputs("~\n", o->file);
+			emit_line(o, NULL, NULL, 0, 0, "~\n", 2);
 		} else {
 			/*
 			 * Skip the prefix character, if any.  With
-- 
2.13.0.18.g7d86cc8ba0


  parent reply	other threads:[~2017-05-24 21:41 UTC|newest]

Thread overview: 125+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20170523024048.16879-1-sbeller@google.com/>
2017-05-24 21:40 ` [PATCHv5 00/17] Diff machine: highlight moved lines Stefan Beller
2017-05-24 21:40   ` [PATCHv5 01/17] diff: readability fix Stefan Beller
2017-05-24 21:40   ` [PATCHv5 02/17] diff: move line ending check into emit_hunk_header Stefan Beller
2017-05-24 21:40   ` [PATCHv5 03/17] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-05-24 21:40   ` [PATCHv5 04/17] diff: introduce more flexible emit function Stefan Beller
2017-06-13 21:54     ` Jonathan Tan
2017-06-13 23:41       ` Stefan Beller
2017-06-13 23:46         ` Jonathan Tan
2017-05-24 21:40   ` Stefan Beller [this message]
2017-05-24 21:40   ` [PATCHv5 06/17] diff.c: convert builtin_diff to use emit_line_* Stefan Beller
2017-05-24 21:40   ` [PATCHv5 07/17] diff.c: convert emit_rewrite_diff " Stefan Beller
2017-05-24 21:40   ` [PATCHv5 08/17] diff.c: convert emit_rewrite_lines " Stefan Beller
2017-05-24 21:40   ` [PATCHv5 09/17] submodule.c: convert show_submodule_summary to use emit_line_fmt Stefan Beller
2017-05-24 21:40   ` [PATCHv5 10/17] diff.c: convert emit_binary_diff_body to use emit_line_* Stefan Beller
2017-05-24 21:40   ` [PATCHv5 11/17] diff.c: convert show_stats " Stefan Beller
2017-05-24 21:40   ` [PATCHv5 12/17] diff.c: convert word diffing " Stefan Beller
2017-05-24 21:40   ` [PATCHv5 13/17] diff.c: convert diff_flush " Stefan Beller
2017-05-24 21:40   ` [PATCHv5 14/17] diff.c: convert diff_summary " Stefan Beller
2017-05-24 21:40   ` [PATCHv5 15/17] diff.c: emit_line includes whitespace highlighting Stefan Beller
2017-05-24 21:40   ` [PATCHv5 16/17] diff: buffer all output if asked to Stefan Beller
2017-05-25  2:26     ` Junio C Hamano
2017-05-25  5:34       ` Stefan Beller
2017-05-26  1:09         ` Junio C Hamano
2017-06-13 22:07     ` Jonathan Tan
2017-06-14  2:52       ` Stefan Beller
2017-05-24 21:40   ` [PATCHv5 17/17] diff.c: color moved lines differently Stefan Beller
2017-05-25  2:27     ` Junio C Hamano
2017-05-25  5:39       ` Stefan Beller
2017-05-25  6:44   ` [PATCHv5 00/17] Diff machine: highlight moved lines Junio C Hamano
2017-05-25 16:31     ` Stefan Beller
2017-05-26  1:20       ` Junio C Hamano
2017-05-26 19:30         ` Stefan Beller
2017-05-27  0:18           ` [PATCH 0/1] " Stefan Beller
2017-05-27  0:18             ` [PATCH 1/1] diff.c: color moved lines differently Stefan Beller
2017-05-27  7:05               ` Philip Oakley
2017-05-30 21:33                 ` Stefan Beller
2017-06-01  0:24                   ` [PATCH] " Stefan Beller
2017-06-13 22:51                     ` Jonathan Tan
2017-06-14 18:55                       ` Stefan Beller
2017-06-20  2:47                         ` [PATCH 00/26] reroll of sb/diff-color-moved Stefan Beller
2017-06-20  2:47                           ` [PATCH 01/26] diff.c: readability fix Stefan Beller
2017-06-20  2:47                           ` [PATCH 02/26] diff.c: move line ending check into emit_hunk_header Stefan Beller
2017-06-20  2:47                           ` [PATCH 03/26] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-06-20  2:47                           ` [PATCH 04/26] diff.c: introduce emit_diff_symbol Stefan Beller
2017-06-21 19:36                             ` Junio C Hamano
2017-06-21 19:46                               ` Stefan Beller
2017-06-21 20:26                                 ` Junio C Hamano
2017-06-21 21:13                                 ` Junio C Hamano
2017-06-21 21:23                                   ` Stefan Beller
2017-06-21 21:43                                     ` Junio C Hamano
2017-06-21 21:51                                       ` Stefan Beller
2017-06-21 21:45                                 ` Brandon Williams
2017-06-21 21:52                                   ` Junio C Hamano
2017-06-21 21:55                                     ` Brandon Williams
2017-06-20  2:47                           ` [PATCH 05/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_MARKER Stefan Beller
2017-06-20  2:47                           ` [PATCH 06/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_FRAGINFO Stefan Beller
2017-06-20  2:47                           ` [PATCH 07/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_NO_LF_EOF Stefan Beller
2017-06-20  2:47                           ` [PATCH 08/26] diff.c: migrate emit_line_checked to use emit_diff_symbol Stefan Beller
2017-06-21 20:05                             ` Junio C Hamano
2017-06-22 23:30                               ` Stefan Beller
2017-06-22 23:37                                 ` Stefan Beller
2017-06-23  4:56                                   ` Junio C Hamano
2017-06-20  2:47                           ` [PATCH 09/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_WORDS{_PORCELAIN} Stefan Beller
2017-06-20  2:48                           ` [PATCH 10/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_INCOMPLETE Stefan Beller
2017-06-20  2:48                           ` [PATCH 11/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_FILEPAIR Stefan Beller
2017-06-20 20:01                             ` Jonathan Tan
2017-06-21 20:09                               ` Junio C Hamano
2017-06-22 23:59                                 ` Stefan Beller
2017-06-20  2:48                           ` [PATCH 12/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_HEADER Stefan Beller
2017-06-20  2:48                           ` [PATCH 13/26] diff.c: emit_diff_symbol learns about DIFF_SYMBOL_BINARY_FILES Stefan Beller
2017-06-21 20:13                             ` Junio C Hamano
2017-06-21 20:47                               ` Stefan Beller
2017-06-20  2:48                           ` [PATCH 14/26] diff.c: emit_diff_symbol learns DIFF_SYMBOL_REWRITE_DIFF Stefan Beller
2017-06-20  2:48                           ` [PATCH 15/26] submodule.c: migrate diff output to use emit_diff_symbol Stefan Beller
2017-06-20 20:09                             ` Jonathan Tan
2017-06-20  2:48                           ` [PATCH 16/26] diff.c: convert emit_binary_diff_body " Stefan Beller
2017-06-21 20:16                             ` Junio C Hamano
2017-06-20  2:48                           ` [PATCH 17/26] diff.c: convert show_stats " Stefan Beller
2017-06-21 21:39                             ` Brandon Williams
2017-06-21 22:16                               ` Stefan Beller
2017-06-20  2:48                           ` [PATCH 18/26] diff.c: convert word diffing " Stefan Beller
2017-06-20  2:48                           ` [PATCH 19/26] diff.c: emit_diff_symbol learns about DIFF_SYMBOL_STAT_SEP Stefan Beller
2017-06-20  2:48                           ` [PATCH 20/26] diff.c: emit_diff_symbol learns about DIFF_SYMBOL_SUMMARY Stefan Beller
2017-06-20  2:48                           ` [PATCH 21/26] diff.c: buffer all output if asked to Stefan Beller
2017-06-20  2:48                           ` [PATCH 22/26] diff.c: color moved lines differently Stefan Beller
2017-06-20 20:13                             ` Jonathan Tan
2017-06-20 20:57                               ` Stefan Beller
2017-06-20  2:48                           ` [PATCH 23/26] diff.c: color moved lines differently, plain mode Stefan Beller
2017-06-20  2:48                           ` [PATCH 24/26] diff.c: add dimming to moved line detection Stefan Beller
2017-06-21 20:23                             ` Junio C Hamano
2017-06-20  2:48                           ` [PATCH 25/26] diff: document the new --color-moved setting Stefan Beller
2017-06-20  2:48                           ` [showing-off RFC/PATCH 26/26] diff.c: have a "machine parseable" move coloring Stefan Beller
2017-06-20  2:50                             ` Stefan Beller
2017-06-23 21:43                               ` Ævar Arnfjörð Bjarmason
2017-06-21 21:51                             ` Brandon Williams
2017-06-21 21:55                               ` Junio C Hamano
2017-06-21 22:40                                 ` Stefan Beller
2017-06-23  1:28                           ` [PATCHv2 00/25] reroll of sb/diff-color-moved Stefan Beller
2017-06-23  1:28                             ` [PATCHv2 01/25] diff.c: readability fix Stefan Beller
2017-06-23  1:28                             ` [PATCHv2 02/25] diff.c: move line ending check into emit_hunk_header Stefan Beller
2017-06-23  1:28                             ` [PATCHv2 03/25] diff.c: factor out diff_flush_patch_all_file_pairs Stefan Beller
2017-06-23  1:28                             ` [PATCHv2 04/25] diff.c: introduce emit_diff_symbol Stefan Beller
2017-06-23 20:07                               ` Junio C Hamano
2017-06-23 20:13                                 ` Stefan Beller
2017-06-23  1:28                             ` [PATCHv2 05/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_MARKER Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 06/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_FRAGINFO Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 07/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_NO_LF_EOF Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 08/25] diff.c: migrate emit_line_checked to use emit_diff_symbol Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 09/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_WORDS[_PORCELAIN] Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 10/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_INCOMPLETE Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 11/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_FILEPAIR_{PLUS, MINUS} Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 12/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_HEADER Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 13/25] diff.c: emit_diff_symbol learns about DIFF_SYMBOL_BINARY_FILES Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 14/25] diff.c: emit_diff_symbol learns DIFF_SYMBOL_REWRITE_DIFF Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 15/25] submodule.c: migrate diff output to use emit_diff_symbol Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 16/25] diff.c: convert emit_binary_diff_body " Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 17/25] diff.c: convert show_stats " Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 18/25] diff.c: convert word diffing " Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 19/25] diff.c: emit_diff_symbol learns about DIFF_SYMBOL_STAT_SEP Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 20/25] diff.c: emit_diff_symbol learns about DIFF_SYMBOL_SUMMARY Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 21/25] diff.c: buffer all output if asked to Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 22/25] diff.c: color moved lines differently Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 23/25] diff.c: color moved lines differently, plain mode Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 24/25] diff.c: add dimming to moved line detection Stefan Beller
2017-06-23  1:29                             ` [PATCHv2 25/25] diff: document the new --color-moved setting Stefan Beller

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