[PATCH v2 3/8] gitweb: Extract print_sidebyside_diff_lines()

["Michał Kiedrowicz" <michal.kiedrowicz@gmail.com>]

Currently, print_sidebyside_diff_chunk() does two things: it
accumulates diff lines and prints them.  Accumulation may be used to
perform additional operations on diff lines,  so it makes sense to split
these two things.  Thus, the code that prints diff lines in a side-by-side
manner is moved out of print_sidebyside_diff_chunk() to a separate
subroutine.

The outcome of this patch is that print_sidebyside_diff_chunk() is now
much shorter and easier to read.

This is a preparation patch for diff refinement highlightning.  It should
not change the gitweb output, but it slightly changes its behavior.
Before this commit, context is printed on the class change. Now, it'it
printed just before printing added and removed lines.

Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com>
---
 gitweb/gitweb.perl |   97 ++++++++++++++++++++++++++++------------------------
 1 files changed, 52 insertions(+), 45 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 1744c40..86d5a02 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -4998,6 +4998,53 @@ sub git_difftree_body {
 	print "</table>\n";
 }
 
+# Print context lines and then rem/add lines in a side-by-side manner.
+sub print_sidebyside_diff_lines {
+	my ($ctx, $rem, $add) = @_;
+
+	# print context block before add/rem block
+	if (@$ctx) {
+		print join '',
+			'<div class="chunk_block ctx">',
+				'<div class="old">',
+				@$ctx,
+				'</div>',
+				'<div class="new">',
+				@$ctx,
+				'</div>',
+			'</div>';
+	}
+
+	if (!@$add) {
+		# pure removal
+		print join '',
+			'<div class="chunk_block rem">',
+				'<div class="old">',
+				@$rem,
+				'</div>',
+			'</div>';
+	} elsif (!@$rem) {
+		# pure addition
+		print join '',
+			'<div class="chunk_block add">',
+				'<div class="new">',
+				@$add,
+				'</div>',
+			'</div>';
+	} else {
+		# assume that it is change
+		print join '',
+			'<div class="chunk_block chg">',
+				'<div class="old">',
+				@$rem,
+				'</div>',
+				'<div class="new">',
+				@$add,
+				'</div>',
+			'</div>';
+	}
+}
+
 sub print_sidebyside_diff_chunk {
 	my @chunk = @_;
 	my (@ctx, @rem, @add);
@@ -5024,51 +5071,11 @@ sub print_sidebyside_diff_chunk {
 			next;
 		}
 
-		## print from accumulator when type of class of lines change
-		# empty contents block on start rem/add block, or end of chunk
-		if (@ctx && (!$class || $class eq 'rem' || $class eq 'add')) {
-			print join '',
-				'<div class="chunk_block ctx">',
-					'<div class="old">',
-					@ctx,
-					'</div>',
-					'<div class="new">',
-					@ctx,
-					'</div>',
-				'</div>';
-			@ctx = ();
-		}
-		# empty add/rem block on start context block, or end of chunk
-		if ((@rem || @add) && (!$class || $class eq 'ctx')) {
-			if (!@add) {
-				# pure removal
-				print join '',
-					'<div class="chunk_block rem">',
-						'<div class="old">',
-						@rem,
-						'</div>',
-					'</div>';
-			} elsif (!@rem) {
-				# pure addition
-				print join '',
-					'<div class="chunk_block add">',
-						'<div class="new">',
-						@add,
-						'</div>',
-					'</div>';
-			} else {
-				# assume that it is change
-				print join '',
-					'<div class="chunk_block chg">',
-						'<div class="old">',
-						@rem,
-						'</div>',
-						'<div class="new">',
-						@add,
-						'</div>',
-					'</div>';
-			}
-			@rem = @add = ();
+		## print from accumulator when have some add/rem lines or end
+		# of chunk (flush context lines)
+		if (((@rem || @add) && $class eq 'ctx') || !$class) {
+			print_sidebyside_diff_lines(\@ctx, \@rem, \@add);
+			@ctx = @rem = @add = ();
 		}
 
 		## adding lines to accumulator
-- 
1.7.8.4