Merge branch 've/userdiff-bash'

The userdiff pattern learned to identify the function definition in
POSIX shells and bash.

* ve/userdiff-bash:
  userdiff: support Bash

Author: gitster

Documentation/gitattributes.txt

@@ -802,6 +802,9 @@ patterns are available:
 
 - `ada` suitable for source code in the Ada language.
 
+- `bash` suitable for source code in the Bourne-Again SHell language.
+  Covers a superset of POSIX shell function definitions.
+
 - `bibtex` suitable for files with BibTeX coded references.
 
 - `cpp` suitable for source code in the C and C++ languages.

t/t4018-diff-funcname.sh

@@ -27,6 +27,7 @@ test_expect_success 'setup' '
 
 diffpatterns="
 	ada
+	bash
 	bibtex
 	cpp
 	csharp

t/t4018/bash-arithmetic-function

@@ -0,0 +1,4 @@
+RIGHT() ((
+
+    ChangeMe = "$x" + "$y"
+))

t/t4018/bash-bashism-style-compact

@@ -0,0 +1,6 @@
+function RIGHT {
+    function InvalidSyntax{
+        :
+        echo 'ChangeMe'
+    }
+}

t/t4018/bash-bashism-style-function

@@ -0,0 +1,4 @@
+function RIGHT {
+    :
+    echo 'ChangeMe'
+}

t/t4018/bash-bashism-style-whitespace

@@ -0,0 +1,4 @@
+	 function 	RIGHT 	( 	) 	{
+
+	    ChangeMe
+	 }

t/t4018/bash-conditional-function

@@ -0,0 +1,4 @@
+RIGHT() [[ \
+
+    "$a" > "$ChangeMe"
+]]

t/t4018/bash-missing-parentheses

@@ -0,0 +1,6 @@
+function RIGHT {
+    functionInvalidSyntax {
+        :
+        echo 'ChangeMe'
+    }
+}

t/t4018/bash-mixed-style-compact

@@ -0,0 +1,4 @@
+function RIGHT(){
+    :
+    echo 'ChangeMe'
+}

t/t4018/bash-mixed-style-function

@@ -0,0 +1,4 @@
+function RIGHT() {
+
+    ChangeMe
+}