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[PATCH 08/25] diff.c: migrate emit_line_checked to use emit_diff_symbol

From
Stefan Beller <sbeller@google.com>
Date
Jun 30, 2017, 00:06 UTC
Message-ID
<20170630000710.10601-9-sbeller@google.com>
In-Reply-To
<20170630000710.10601-1-sbeller@google.com>
Add a new flags field to emit_diff_symbol, that will be used by
context lines for:
* white space rules that are applicable (The first 12 bits)
  Take a note in cahe.c as well, when this ws rules are extended we have
  to fix the bits in the flags field.
* how the rules are evaluated (actually this double encodes the sign
  of the line, but the code is easier to keep this way, bits 13,14,15)
* if the line a blank line at EOF (bit 16)

The check if new lines need to be marked up as extra lines at the end of file, is now done unconditionally. That should be ok, as 'new_blank_line_at_eof' has a quick early return.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 cache.h |   2 ++
 diff.c  | 116 +++++++++++++++++++++++++++++++++++++++++-----------------------
 diff.h  |   6 ++--
 3 files changed, 80 insertions(+), 44 deletions(-)
diff --git a/cache.h b/cache.h
index 96055c2229..18aabacba5 100644
--- a/cache.h
+++ b/cache.h
@@ -1996,6 +1996,8 @@ void shift_tree_by(const struct object_id *, const struct object_id *, struct ob
 #define WS_TRAILING_SPACE      (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
 #define WS_TAB_WIDTH_MASK        077
+/* All WS_* -- when extended, adapt diff.c emit_symbol */
+#define WS_RULE_MASK           07777
 extern unsigned whitespace_rule_cfg;
 extern unsigned whitespace_rule(const char *);
 extern unsigned parse_whitespace_rule(const char *);
diff --git a/diff.c b/diff.c
index 488096b757..e5430d56da 100644
--- a/diff.c
+++ b/diff.c
@@ -561,17 +561,54 @@ static void emit_line(struct diff_options *o, const char *set, const char *reset
 }
 
 enum diff_symbol {
+	DIFF_SYMBOL_CONTEXT,
+	DIFF_SYMBOL_PLUS,
+	DIFF_SYMBOL_MINUS,
 	DIFF_SYMBOL_NO_LF_EOF,
 	DIFF_SYMBOL_CONTEXT_FRAGINFO,
 	DIFF_SYMBOL_CONTEXT_MARKER,
 	DIFF_SYMBOL_SEPARATOR
 };
+/*
+ * Flags for content lines:
+ * 0..12 are whitespace rules
+ * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
+ * 16 is marking if the line is blank at EOF
+ */
+#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
+#define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
+
+static void emit_line_ws_markup(struct diff_options *o,
+				const char *set, const char *reset,
+				const char *line, int len, char sign,
+				unsigned ws_rule, int blank_at_eof)
+{
+	const char *ws = NULL;
+
+	if (o->ws_error_highlight & ws_rule) {
+		ws = diff_get_color_opt(o, DIFF_WHITESPACE);
+		if (!*ws)
+			ws = NULL;
+	}
+
+	if (!ws)
+		emit_line_0(o, set, reset, sign, line, len);
+	else if (blank_at_eof)
+		/* Blank line at EOF - paint '+' as well */
+		emit_line_0(o, ws, reset, sign, line, len);
+	else {
+		/* Emit just the prefix, then the rest. */
+		emit_line_0(o, set, reset, sign, "", 0);
+		ws_check_emit(line, len, ws_rule,
+			      o->file, set, reset, ws);
+	}
+}
 
 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
-			     const char *line, int len)
+			     const char *line, int len, unsigned flags)
 {
 	static const char *nneof = " No newline at end of file\n";
-	const char *context, *reset;
+	const char *context, *reset, *set;
 	switch (s) {
 	case DIFF_SYMBOL_NO_LF_EOF:
 		context = diff_get_color_opt(o, DIFF_CONTEXT);
@@ -593,6 +630,25 @@ static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
 			diff_line_prefix(o),
 			o->line_termination);
 		break;
+	case DIFF_SYMBOL_CONTEXT:
+		set = diff_get_color_opt(o, DIFF_CONTEXT);
+		reset = diff_get_color_opt(o, DIFF_RESET);
+		emit_line_ws_markup(o, set, reset, line, len, ' ',
+				    flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
+		break;
+	case DIFF_SYMBOL_PLUS:
+		set = diff_get_color_opt(o, DIFF_FILE_NEW);
+		reset = diff_get_color_opt(o, DIFF_RESET);
+		emit_line_ws_markup(o, set, reset, line, len, '+',
+				    flags & DIFF_SYMBOL_CONTENT_WS_MASK,
+				    flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
+		break;
+	case DIFF_SYMBOL_MINUS:
+		set = diff_get_color_opt(o, DIFF_FILE_OLD);
+		reset = diff_get_color_opt(o, DIFF_RESET);
+		emit_line_ws_markup(o, set, reset, line, len, '-',
+				    flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
+		break;
 	default:
 		die("BUG: unknown diff symbol");
 	}
@@ -609,57 +665,31 @@ static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line
 	return ws_blank_line(line, len, ecbdata->ws_rule);
 }
 
-static void emit_line_checked(const char *reset,
-			      struct emit_callback *ecbdata,
-			      const char *line, int len,
-			      enum color_diff color,
-			      unsigned ws_error_highlight,
-			      char sign)
-{
-	const char *set = diff_get_color(ecbdata->color_diff, color);
-	const char *ws = NULL;
-
-	if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
-		ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
-		if (!*ws)
-			ws = NULL;
-	}
-
-	if (!ws)
-		emit_line_0(ecbdata->opt, set, reset, sign, line, len);
-	else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
-		/* Blank line at EOF - paint '+' as well */
-		emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
-	else {
-		/* Emit just the prefix, then the rest. */
-		emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
-		ws_check_emit(line, len, ecbdata->ws_rule,
-			      ecbdata->opt->file, set, reset, ws);
-	}
-}
-
 static void emit_add_line(const char *reset,
 			  struct emit_callback *ecbdata,
 			  const char *line, int len)
 {
-	emit_line_checked(reset, ecbdata, line, len,
-			  DIFF_FILE_NEW, WSEH_NEW, '+');
+	unsigned flags = WSEH_NEW | ecbdata->ws_rule;
+	if (new_blank_line_at_eof(ecbdata, line, len))
+		flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
+
+	emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
 }
 
 static void emit_del_line(const char *reset,
 			  struct emit_callback *ecbdata,
 			  const char *line, int len)
 {
-	emit_line_checked(reset, ecbdata, line, len,
-			  DIFF_FILE_OLD, WSEH_OLD, '-');
+	unsigned flags = WSEH_OLD | ecbdata->ws_rule;
+	emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
 }
 
 static void emit_context_line(const char *reset,
 			      struct emit_callback *ecbdata,
 			      const char *line, int len)
 {
-	emit_line_checked(reset, ecbdata, line, len,
-			  DIFF_CONTEXT, WSEH_CONTEXT, ' ');
+	unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
+	emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
 }
 
 static void emit_hunk_header(struct emit_callback *ecbdata,
@@ -683,7 +713,7 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
 	    memcmp(line, atat, 2) ||
 	    !(ep = memmem(line + 2, len - 2, atat, 2))) {
 		emit_diff_symbol(ecbdata->opt,
-				 DIFF_SYMBOL_CONTEXT_MARKER, line, len);
+				 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
 		return;
 	}
 	ep += 2; /* skip over @@ */
@@ -719,7 +749,7 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
 	strbuf_add(&msgbuf, line + len, org_len - len);
 	strbuf_complete_line(&msgbuf);
 	emit_diff_symbol(ecbdata->opt,
-			 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len);
+			 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
 	strbuf_release(&msgbuf);
 }
 
@@ -778,7 +808,7 @@ static void emit_rewrite_lines(struct emit_callback *ecb,
 		data += len;
 	}
 	if (!endp)
-		emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0);
+		emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
 }
 
 static void emit_rewrite_diff(const char *name_a,
@@ -4771,6 +4801,10 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
 {
 	int i;
 	struct diff_queue_struct *q = &diff_queued_diff;
+
+	if (WSEH_NEW & WS_RULE_MASK)
+		die("BUG: WS rules bit mask overlaps with diff symbol flags");
+
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filepair *p = q->queue[i];
 		if (check_pair_status(p))
@@ -4861,7 +4895,7 @@ void diff_flush(struct diff_options *options)
 
 	if (output_format & DIFF_FORMAT_PATCH) {
 		if (separator) {
-			emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0);
+			emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
 			if (options->stat_sep) {
 				/* attach patch instead of inline */
 				fputs(options->stat_sep, options->file);
diff --git a/diff.h b/diff.h
index 2d442e296f..ea66168454 100644
--- a/diff.h
+++ b/diff.h
@@ -148,9 +148,9 @@ struct diff_options {
 	int abbrev;
 	int ita_invisible_in_index;
 /* white-space error highlighting */
-#define WSEH_NEW 1
-#define WSEH_CONTEXT 2
-#define WSEH_OLD 4
+#define WSEH_NEW (1<<12)
+#define WSEH_CONTEXT (1<<13)
+#define WSEH_OLD (1<<14)
 	unsigned ws_error_highlight;
 	const char *prefix;
 	int prefix_length;

-- 
2.13.0.31.g9b732c453e
Previous: Stefan BellerNext: Stefan Beller
Message 33 of 63 in “Reroll of sb/diff-color-moved.”
  1. 00/25 Reroll of sb/diff-color-moved.Stefan Beller, Jun 30, 2017
  2. 02/25 diff.c: move line ending check into emit_hunk_headerStefan Beller, Jun 30, 2017
  3. 12/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_HEADERStefan Beller, Jun 30, 2017
  4. 04/25 diff.c: introduce emit_diff_symbolStefan Beller, Jun 30, 2017
  5. 06/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_FRAGINFOStefan Beller, Jun 30, 2017
  6. 01/25 diff.c: readability fixStefan Beller, Jun 30, 2017
  7. 05/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_MARKERStefan Beller, Jun 30, 2017
  8. 03/25 diff.c: factor out diff_flush_patch_all_file_pairsStefan Beller, Jun 30, 2017
  9. 07/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_NO_LF_EOFStefan Beller, Jun 30, 2017
  10. 18/25 diff.c: convert word diffing to use emit_diff_symbolStefan Beller, Jun 30, 2017
  11. 13/25 diff.c: emit_diff_symbol learns about DIFF_SYMBOL_BINARY_FILESStefan Beller, Jun 30, 2017
  12. 21/25 diff.c: buffer all output if asked toStefan Beller, Jun 30, 2017
  13. 20/25 diff.c: emit_diff_symbol learns about DIFF_SYMBOL_SUMMARYStefan Beller, Jun 30, 2017
  14. 22/25 diff.c: color moved lines differentlyStefan Beller, Jun 30, 2017
  15. Junio C HamanoJun 30, 2017
  16. Stefan BellerJun 30, 2017
  17. Junio C HamanoJun 30, 2017
  18. 24/25 diff.c: add dimming to moved line detectionStefan Beller, Jun 30, 2017
  19. 25/25 diff: document the new --color-moved settingStefan Beller, Jun 30, 2017
  20. Simon RuderichJun 30, 2017
  21. Stefan BellerJun 30, 2017
  22. Simon RuderichJun 30, 2017
  23. Stefan BellerJun 30, 2017
  24. 19/25 diff.c: emit_diff_symbol learns about DIFF_SYMBOL_STAT_SEPStefan Beller, Jun 30, 2017
  25. 11/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_FILEPAIR_{PLUS, MINUS}Stefan Beller, Jun 30, 2017
  26. 23/25 diff.c: color moved lines differently, plain modeStefan Beller, Jun 30, 2017
  27. 15/25 submodule.c: migrate diff output to use emit_diff_symbolStefan Beller, Jun 30, 2017
  28. 14/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_REWRITE_DIFFStefan Beller, Jun 30, 2017
  29. 16/25 diff.c: convert emit_binary_diff_body to use emit_diff_symbolStefan Beller, Jun 30, 2017
  30. 10/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_INCOMPLETEStefan Beller, Jun 30, 2017
  31. 17/25 diff.c: convert show_stats to use emit_diff_symbolStefan Beller, Jun 30, 2017
  32. 09/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_WORDS[_PORCELAIN]Stefan Beller, Jun 30, 2017
  33. 08/25 diff.c: migrate emit_line_checked to use emit_diff_symbolStefan Beller, Jun 30, 2017
  34. 00/25 Reroll of sb/diff-color-moved.Stefan Beller, Jun 30, 2017
  35. 01/25 diff.c: readability fixStefan Beller, Jun 30, 2017
  36. 02/25 diff.c: move line ending check into emit_hunk_headerStefan Beller, Jun 30, 2017
  37. 06/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_FRAGINFOStefan Beller, Jun 30, 2017
  38. 07/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_NO_LF_EOFStefan Beller, Jun 30, 2017
  39. 05/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_MARKERStefan Beller, Jun 30, 2017
  40. 12/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_HEADERStefan Beller, Jun 30, 2017
  41. 13/25 diff.c: emit_diff_symbol learns about DIFF_SYMBOL_BINARY_FILESStefan Beller, Jun 30, 2017
  42. 14/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_REWRITE_DIFFStefan Beller, Jun 30, 2017
  43. 09/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_WORDS[_PORCELAIN]Stefan Beller, Jun 30, 2017
  44. 20/25 diff.c: emit_diff_symbol learns about DIFF_SYMBOL_SUMMARYStefan Beller, Jun 30, 2017
  45. 18/25 diff.c: convert word diffing to use emit_diff_symbolStefan Beller, Jun 30, 2017
  46. 17/25 diff.c: convert show_stats to use emit_diff_symbolStefan Beller, Jun 30, 2017
  47. 15/25 submodule.c: migrate diff output to use emit_diff_symbolStefan Beller, Jun 30, 2017
  48. 21/25 diff.c: buffer all output if asked toStefan Beller, Jun 30, 2017
  49. 25/25 diff: document the new --color-moved settingStefan Beller, Jun 30, 2017
  50. 23/25 diff.c: color moved lines differently, plain modeStefan Beller, Jun 30, 2017
  51. 22/25 diff.c: color moved lines differentlyStefan Beller, Jun 30, 2017
  52. Junio C HamanoJun 30, 2017
  53. Stefan BellerJun 30, 2017
  54. Junio C HamanoJun 30, 2017
  55. 24/25 diff.c: add dimming to moved line detectionStefan Beller, Jun 30, 2017
  56. 19/25 diff.c: emit_diff_symbol learns about DIFF_SYMBOL_STAT_SEPStefan Beller, Jun 30, 2017
  57. 16/25 diff.c: convert emit_binary_diff_body to use emit_diff_symbolStefan Beller, Jun 30, 2017
  58. 03/25 diff.c: factor out diff_flush_patch_all_file_pairsStefan Beller, Jun 30, 2017
  59. 11/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_FILEPAIR_{PLUS, MINUS}Stefan Beller, Jun 30, 2017
  60. 10/25 diff.c: emit_diff_symbol learns DIFF_SYMBOL_CONTEXT_INCOMPLETEStefan Beller, Jun 30, 2017
  61. 08/25 diff.c: migrate emit_line_checked to use emit_diff_symbolStefan Beller, Jun 30, 2017
  62. 04/25 diff.c: introduce emit_diff_symbolStefan Beller, Jun 30, 2017
  63. Junio C HamanoJun 30, 2017

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