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[PATCH 3/5] diff-highlight: refactor to prepare for multi-line hunks

From
Jeff King <peff@peff.net>
Date
Feb 13, 2012, 22:33 UTC
Message-ID
<20120213223310.GC19521@sigill.intra.peff.net>
In-Reply-To
<20120213222702.GA19393@sigill.intra.peff.net>

The current code structure assumes that we will only look at a pair of lines at any given time, and that the end result should always be to output that pair. However, we want to eventually handle multi-line hunks, which will involve collating pairs of removed/added lines. Let's refactor the code to return highlighted pairs instead of printing them.

Signed-off-by: Jeff King <peff@peff.net>
---
You did a similar refactoring in your patch, but I found pulling it out
made the next patch a lot more readable.
 contrib/diff-highlight/diff-highlight |   22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/contrib/diff-highlight/diff-highlight b/contrib/diff-highlight/diff-highlight
index 0d8df84..279d211 100755
--- a/contrib/diff-highlight/diff-highlight
+++ b/contrib/diff-highlight/diff-highlight
@@ -23,7 +23,7 @@ while (<>) {
 	    $window[2] =~ /^$COLOR*\+/ &&
 	    $window[3] !~ /^$COLOR*\+/) {
 		print shift @window;
-		show_pair(shift @window, shift @window);
+		show_hunk(shift @window, shift @window);
 	}
 	else {
 		print shift @window;
@@ -48,7 +48,7 @@ if (@window == 3 &&
     $window[1] =~ /^$COLOR*-/ &&
     $window[2] =~ /^$COLOR*\+/) {
 	print shift @window;
-	show_pair(shift @window, shift @window);
+	show_hunk(shift @window, shift @window);
 }
 
 # And then flush any remaining lines.
@@ -58,7 +58,13 @@ while (@window) {
 
 exit 0;
 
-sub show_pair {
+sub show_hunk {
+	my ($a, $b) = @_;
+
+	print highlight_pair($a, $b);
+}
+
+sub highlight_pair {
 	my @a = split_line(shift);
 	my @b = split_line(shift);
 
@@ -106,12 +112,12 @@ sub show_pair {
 	}
 
 	if (is_pair_interesting(\@a, $pa, $sa, \@b, $pb, $sb)) {
-		print highlight(\@a, $pa, $sa);
-		print highlight(\@b, $pb, $sb);
+		return highlight_line(\@a, $pa, $sa),
+		       highlight_line(\@b, $pb, $sb);
 	}
 	else {
-		print join('', @a);
-		print join('', @b);
+		return join('', @a),
+		       join('', @b);
 	}
 }
 
@@ -121,7 +127,7 @@ sub split_line {
 	       split /($COLOR*)/;
 }
 
-sub highlight {
+sub highlight_line {
 	my ($line, $prefix, $suffix) = @_;
 
 	return join('',

-- 
1.7.8.4.17.g2df81
Previous: Michal KiedrowiczNext: Jeff King
Message 37 of 67 in “gitweb: Highlight interesting parts of diff”
  1. 0/8 gitweb: Highlight interesting parts of diffMichał Kiedrowicz, Feb 10, 2012
  2. 1/8 gitweb: Extract print_sidebyside_diff_lines()Michał Kiedrowicz, Feb 10, 2012
  3. Jakub NarebskiFeb 11, 2012
  4. Michał KiedrowiczFeb 11, 2012
  5. 2/8 gitweb: Use print_diff_chunk() for both side-by-side and inline diffsMichał Kiedrowicz, Feb 10, 2012
  6. Jakub NarebskiFeb 11, 2012
  7. Michał KiedrowiczFeb 11, 2012
  8. Michał KiedrowiczFeb 25, 2012
  9. 3/8 gitweb: Move HTML-formatting diff line back to process_diff_line()Michał Kiedrowicz, Feb 10, 2012
  10. Jakub NarebskiFeb 11, 2012
  11. 4/8 gitweb: Push formatting diff lines to print_diff_chunk()Michał Kiedrowicz, Feb 10, 2012
  12. Jakub NarebskiFeb 11, 2012
  13. Michał KiedrowiczFeb 11, 2012
  14. Michał KiedrowiczFeb 11, 2012
  15. 5/8 gitweb: Format diff lines just before printingMichał Kiedrowicz, Feb 10, 2012
  16. Jakub NarebskiFeb 11, 2012
  17. Michał KiedrowiczFeb 11, 2012
  18. 6/8 gitweb: Highlight interesting parts of diffMichał Kiedrowicz, Feb 10, 2012
  19. Jakub NarebskiFeb 10, 2012
  20. Michał KiedrowiczFeb 10, 2012
  21. Jakub NarebskiFeb 10, 2012
  22. Michał KiedrowiczFeb 10, 2012
  23. Jakub NarebskiFeb 10, 2012
  24. Jeff KingFeb 10, 2012
  25. Michal KiedrowiczFeb 14, 2012
  26. Junio C HamanoFeb 14, 2012
  27. Jeff KingFeb 14, 2012
  28. Jeff KingFeb 10, 2012
  29. Michał KiedrowiczFeb 10, 2012
  30. Jeff KingFeb 10, 2012
  31. Michał KiedrowiczFeb 10, 2012
  32. diff-highlight: Work for multiline changes tooMichał Kiedrowicz, Feb 10, 2012
  33. Jeff KingFeb 13, 2012
  34. 1/5 diff-highlight: make perl strict and warnings fatalJeff King, Feb 13, 2012
  35. 2/5 diff-highlight: don't highlight whole linesJeff King, Feb 13, 2012
  36. Michal KiedrowiczFeb 14, 2012
  37. 3/5 diff-highlight: refactor to prepare for multi-line hunksJeff King, Feb 13, 2012
  38. 4/5 diff-highlight: match multi-line hunksJeff King, Feb 13, 2012
  39. 5/5 diff-highlight: document some non-optimal casesJeff King, Feb 13, 2012
  40. Michal KiedrowiczFeb 14, 2012
  41. Junio C HamanoFeb 14, 2012
  42. Jeff KingFeb 14, 2012
  43. Junio C HamanoFeb 14, 2012
  44. Jeff KingFeb 14, 2012
  45. Michal KiedrowiczFeb 14, 2012
  46. Jakub NarebskiFeb 10, 2012
  47. Jakub NarebskiFeb 11, 2012
  48. Jakub NarebskiFeb 12, 2012
  49. Michal KiedrowiczFeb 13, 2012
  50. Jakub NarebskiFeb 13, 2012
  51. Michał KiedrowiczFeb 13, 2012
  52. Michal KiedrowiczFeb 13, 2012
  53. Jakub NarebskiFeb 13, 2012
  54. Michał KiedrowiczFeb 13, 2012
  55. Jakub NarebskiFeb 14, 2012
  56. Michał KiedrowiczFeb 14, 2012
  57. Jeff KingFeb 14, 2012
  58. Michał KiedrowiczFeb 14, 2012
  59. Jeff KingFeb 14, 2012
  60. 7/8 gitweb: Use different colors to present marked changesMichał Kiedrowicz, Feb 10, 2012
  61. Jakub NarebskiFeb 12, 2012
  62. Michal KiedrowiczFeb 13, 2012
  63. 8/8 gitweb: Highlight combined diffsMichał Kiedrowicz, Feb 10, 2012
  64. Jakub NarebskiFeb 12, 2012
  65. Michal KiedrowiczFeb 13, 2012
  66. Jakub NarebskiFeb 11, 2012
  67. Michał KiedrowiczFeb 11, 2012

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