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git/t/t4034-diff-words.sh
Thomas Rast 882749a04f diff: add --word-diff option that generalizes --color-words 
This teaches the --color-words engine a more general interface that
supports two new modes:

* --word-diff=plain, inspired by the 'wdiff' utility (most similar to
  'wdiff -n <old> <new>'): uses delimiters [-removed-] and {+added+}

* --word-diff=porcelain, which generates an ad-hoc machine readable
  format:
  - each diff unit is prefixed by [-+ ] and terminated by newline as
    in unified diff
  - newlines in the input are output as a line consisting only of a
    tilde '~'

Both of these formats still support color if it is enabled, using it
to highlight the differences.  --color-words becomes a synonym for
--word-diff=color, which is the color-only format.  Also adds some
compatibility/convenience options.

Thanks to Junio C Hamano and Miles Bader for good ideas.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-04-14 10:56:53 -07:00

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#!/bin/sh
test_description='word diff colors'
. ./test-lib.sh
test_expect_success setup '
git config diff.color.old red
git config diff.color.new green
git config diff.color.func magenta
'
word_diff () {
test_must_fail git diff --no-index "$@" pre post > output &&
test_decode_color <output >output.decrypted &&
test_cmp expect output.decrypted
}
cat > pre <<\EOF
h(4)
a = b + c
EOF
cat > post <<\EOF
h(4),hh[44]
a = b + c
aa = a
aeff = aeff * ( aaa )
EOF
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 330b04f..5ed8eff 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1,3 +1,7 @@<RESET>
<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
a = b + c<RESET>
<GREEN>aa = a<RESET>
<GREEN>aeff = aeff * ( aaa )<RESET>
EOF
test_expect_success 'word diff with runs of whitespace' '
word_diff --color-words
'
test_expect_success '--word-diff=color' '
word_diff --word-diff=color
'
test_expect_success '--color --word-diff=color' '
word_diff --color --word-diff=color
'
sed 's/#.*$//' > expect <<EOF
diff --git a/pre b/post
index 330b04f..5ed8eff 100644
--- a/pre
+++ b/post
@@ -1,3 +1,7 @@
-h(4)
+h(4),hh[44]
~
# significant space
~
a = b + c
~
~
+aa = a
~
~
+aeff = aeff * ( aaa )
~
EOF
test_expect_success '--word-diff=porcelain' '
word_diff --word-diff=porcelain
'
cat > expect <<EOF
diff --git a/pre b/post
index 330b04f..5ed8eff 100644
--- a/pre
+++ b/post
@@ -1,3 +1,7 @@
[-h(4)-]{+h(4),hh[44]+}
a = b + c
{+aa = a+}
{+aeff = aeff * ( aaa )+}
EOF
test_expect_success '--word-diff=plain' '
word_diff --word-diff=plain
'
test_expect_success '--word-diff=plain --no-color' '
word_diff --word-diff=plain --no-color
'
cat > expect <<EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 330b04f..5ed8eff 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1,3 +1,7 @@<RESET>
<RED>[-h(4)-]<RESET><GREEN>{+h(4),hh[44]+}<RESET>
a = b + c<RESET>
<GREEN>{+aa = a+}<RESET>
<GREEN>{+aeff = aeff * ( aaa )+}<RESET>
EOF
test_expect_success '--word-diff=plain --color' '
word_diff --word-diff=plain --color
'
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 330b04f..5ed8eff 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1 +1 @@<RESET>
<RED>h(4)<RESET><GREEN>h(4),hh[44]<RESET>
<CYAN>@@ -3,0 +4,4 @@<RESET> <RESET><MAGENTA>a = b + c<RESET>
<GREEN>aa = a<RESET>
<GREEN>aeff = aeff * ( aaa )<RESET>
EOF
test_expect_success 'word diff without context' '
word_diff --color-words --unified=0
'
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 330b04f..5ed8eff 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1,3 +1,7 @@<RESET>
h(4),<GREEN>hh<RESET>[44]
a = b + c<RESET>
<GREEN>aa = a<RESET>
<GREEN>aeff = aeff * ( aaa<RESET> )
EOF
cp expect expect.letter-runs-are-words
test_expect_success 'word diff with a regular expression' '
word_diff --color-words="[a-z]+"
'
test_expect_success 'set a diff driver' '
git config diff.testdriver.wordRegex "[^[:space:]]" &&
cat <<EOF > .gitattributes
pre diff=testdriver
post diff=testdriver
EOF
'
test_expect_success 'option overrides .gitattributes' '
word_diff --color-words="[a-z]+"
'
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 330b04f..5ed8eff 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1,3 +1,7 @@<RESET>
h(4)<GREEN>,hh[44]<RESET>
a = b + c<RESET>
<GREEN>aa = a<RESET>
<GREEN>aeff = aeff * ( aaa )<RESET>
EOF
cp expect expect.non-whitespace-is-word
test_expect_success 'use regex supplied by driver' '
word_diff --color-words
'
test_expect_success 'set diff.wordRegex option' '
git config diff.wordRegex "[[:alnum:]]+"
'
cp expect.letter-runs-are-words expect
test_expect_success 'command-line overrides config' '
word_diff --color-words="[a-z]+"
'
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 330b04f..5ed8eff 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1,3 +1,7 @@<RESET>
h(4),<GREEN>{+hh+}<RESET>[44]
a = b + c<RESET>
<GREEN>{+aa = a+}<RESET>
<GREEN>{+aeff = aeff * ( aaa+}<RESET> )
EOF
test_expect_success 'command-line overrides config: --word-diff-regex' '
word_diff --color --word-diff-regex="[a-z]+"
'
cp expect.non-whitespace-is-word expect
test_expect_success '.gitattributes override config' '
word_diff --color-words
'
test_expect_success 'remove diff driver regex' '
git config --unset diff.testdriver.wordRegex
'
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 330b04f..5ed8eff 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1,3 +1,7 @@<RESET>
h(4),<GREEN>hh[44<RESET>]
a = b + c<RESET>
<GREEN>aa = a<RESET>
<GREEN>aeff = aeff * ( aaa<RESET> )
EOF
test_expect_success 'use configured regex' '
word_diff --color-words
'
echo 'aaa (aaa)' > pre
echo 'aaa (aaa) aaa' > post
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index c29453b..be22f37 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1 +1 @@<RESET>
aaa (aaa) <GREEN>aaa<RESET>
EOF
test_expect_success 'test parsing words for newline' '
word_diff --color-words="a+"
'
echo '(:' > pre
echo '(' > post
cat > expect <<\EOF
<WHITE>diff --git a/pre b/post<RESET>
<WHITE>index 289cb9d..2d06f37 100644<RESET>
<WHITE>--- a/pre<RESET>
<WHITE>+++ b/post<RESET>
<CYAN>@@ -1 +1 @@<RESET>
(<RED>:<RESET>
EOF
test_expect_success 'test when words are only removed at the end' '
word_diff --color-words=.
'
cat > expect <<\EOF
diff --git a/pre b/post
index 289cb9d..2d06f37 100644
--- a/pre
+++ b/post
@@ -1 +1 @@
-(:
+(
EOF
test_expect_success '--word-diff=none' '
word_diff --word-diff=plain --word-diff=none
'
test_done
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