diff tests/test-diff-color.t @ 35277:6ba79cf34f5e

patch: add within-line color diff capacity

The `diff' command usually writes deletion in red and insertions in green. This
patch adds within-line colors, to highlight which part of the lines differ.
Lines to compare are decided based on their similarity ratio, as computed by
difflib SequenceMatcher, with an arbitrary threshold (0.7) to decide at which
point two lines are considered entirely different (therefore no inline-diff
required).

The current implementation is kept behind an experimental flag in order to test
the effect on performance. In order to activate it, set inline-color-diff to
true in [experimental].

--- a/tests/test-diff-color.t	Thu Sep 22 18:23:58 2016 +0900
+++ b/tests/test-diff-color.t	Thu Oct 26 00:13:38 2017 +0900
@@ -259,3 +259,95 @@
   \x1b[0;32m+\x1b[0m\x1b[0;1;35m	\x1b[0m\x1b[0;32mall\x1b[0m\x1b[0;1;35m		\x1b[0m\x1b[0;32mtabs\x1b[0m\x1b[0;1;41m	\x1b[0m (esc)
 
   $ cd ..
+
+test inline color diff
+
+  $ hg init inline
+  $ cd inline
+  $ cat > file1 << EOF
+  > this is the first line
+  > this is the second line
+  >     third line starts with space
+  > + starts with a plus sign
+  > 
+  > this line won't change
+  > 
+  > two lines are going to
+  > be changed into three!
+  > 
+  > three of those lines will
+  > collapse onto one
+  > (to see if it works)
+  > EOF
+  $ hg add file1
+  $ hg ci -m 'commit'
+  $ cat > file1 << EOF
+  > that is the first paragraph
+  >     this is the second line
+  > third line starts with space
+  > - starts with a minus sign
+  > 
+  > this line won't change
+  > 
+  > two lines are going to
+  > (entirely magically,
+  >  assuming this works)
+  > be changed into four!
+  > 
+  > three of those lines have
+  > collapsed onto one
+  > EOF
+  $ hg diff --config experimental.worddiff=False --color=debug
+  [diff.diffline|diff --git a/file1 b/file1]
+  [diff.file_a|--- a/file1]
+  [diff.file_b|+++ b/file1]
+  [diff.hunk|@@ -1,13 +1,14 @@]
+  [diff.deleted|-this is the first line]
+  [diff.deleted|-this is the second line]
+  [diff.deleted|-    third line starts with space]
+  [diff.deleted|-+ starts with a plus sign]
+  [diff.inserted|+that is the first paragraph]
+  [diff.inserted|+    this is the second line]
+  [diff.inserted|+third line starts with space]
+  [diff.inserted|+- starts with a minus sign]
+   
+   this line won't change
+   
+   two lines are going to
+  [diff.deleted|-be changed into three!]
+  [diff.inserted|+(entirely magically,]
+  [diff.inserted|+ assuming this works)]
+  [diff.inserted|+be changed into four!]
+   
+  [diff.deleted|-three of those lines will]
+  [diff.deleted|-collapse onto one]
+  [diff.deleted|-(to see if it works)]
+  [diff.inserted|+three of those lines have]
+  [diff.inserted|+collapsed onto one]
+  $ hg diff --config experimental.worddiff=True --color=debug
+  [diff.diffline|diff --git a/file1 b/file1]
+  [diff.file_a|--- a/file1]
+  [diff.file_b|+++ b/file1]
+  [diff.hunk|@@ -1,13 +1,14 @@]
+  [diff.deleted|-this is the ][diff.deleted.highlight|first][diff.deleted| line]
+  [diff.deleted|-this is the second line]
+  [diff.deleted|-][diff.deleted.highlight|    ][diff.deleted|third line starts with space]
+  [diff.deleted|-][diff.deleted.highlight|+][diff.deleted| starts with a ][diff.deleted.highlight|plus][diff.deleted| sign]
+  [diff.inserted|+that is the first paragraph]
+  [diff.inserted|+][diff.inserted.highlight|    ][diff.inserted|this is the ][diff.inserted.highlight|second][diff.inserted| line]
+  [diff.inserted|+third line starts with space]
+  [diff.inserted|+][diff.inserted.highlight|-][diff.inserted| starts with a ][diff.inserted.highlight|minus][diff.inserted| sign]
+   
+   this line won't change
+   
+   two lines are going to
+  [diff.deleted|-be changed into ][diff.deleted.highlight|three][diff.deleted|!]
+  [diff.inserted|+(entirely magically,]
+  [diff.inserted|+ assuming this works)]
+  [diff.inserted|+be changed into ][diff.inserted.highlight|four][diff.inserted|!]
+   
+  [diff.deleted|-three of those lines ][diff.deleted.highlight|will]
+  [diff.deleted|-][diff.deleted.highlight|collapse][diff.deleted| onto one]
+  [diff.deleted|-(to see if it works)]
+  [diff.inserted|+three of those lines ][diff.inserted.highlight|have]
+  [diff.inserted|+][diff.inserted.highlight|collapsed][diff.inserted| onto one]