Merge branch 'ag/userdiff-go-funcname'

"git diff" and friends learned funcname patterns for Go language
source files.

* ag/userdiff-go-funcname:
  userdiff: add built-in pattern for golang

8 files changed, 37 insertions, 0 deletions

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index c21f5ca..d52b254 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -714,6 +714,8 @@ patterns are available:
 
 - `fountain` suitable for Fountain documents.
 
+- `golang` suitable for source code in the Go language.
+
 - `html` suitable for HTML/XHTML documents.
 
 - `java` suitable for source code in the Java language.
diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
index 1795ffc..22f9f88 100755
--- a/t/t4018-diff-funcname.sh
+++ b/t/t4018-diff-funcname.sh
@@ -33,6 +33,7 @@ diffpatterns="
 	css
 	fortran
 	fountain
+	golang
 	html
 	java
 	matlab
diff --git a/t/t4018/golang-complex-function b/t/t4018/golang-complex-function
new file mode 100644
index 0000000..e057dce
--- /dev/null
+++ b/t/t4018/golang-complex-function
@@ -0,0 +1,8 @@
+type Test struct {
+	a Type
+}
+
+func (t *Test) RIGHT(a Type) (Type, error) {
+	t.a = a
+	return ChangeMe, nil
+}
diff --git a/t/t4018/golang-func b/t/t4018/golang-func
new file mode 100644
index 0000000..8e9c9ac
--- /dev/null
+++ b/t/t4018/golang-func
@@ -0,0 +1,4 @@
+func RIGHT() {
+	a := 5
+	b := ChangeMe
+}
diff --git a/t/t4018/golang-interface b/t/t4018/golang-interface
new file mode 100644
index 0000000..553bede
--- /dev/null
+++ b/t/t4018/golang-interface
@@ -0,0 +1,4 @@
+type RIGHT interface {
+	a() Type
+	b() ChangeMe
+}
diff --git a/t/t4018/golang-long-func b/t/t4018/golang-long-func
new file mode 100644
index 0000000..ac3a77b
--- /dev/null
+++ b/t/t4018/golang-long-func
@@ -0,0 +1,5 @@
+func RIGHT(aVeryVeryVeryLongVariableName AVeryVeryVeryLongType,
+	anotherLongVariableName AnotherLongType) {
+	a := 5
+	b := ChangeMe
+}
diff --git a/t/t4018/golang-struct b/t/t4018/golang-struct
new file mode 100644
index 0000000..5deda77
--- /dev/null
+++ b/t/t4018/golang-struct
@@ -0,0 +1,4 @@
+type RIGHT struct {
+	a Type
+	b ChangeMe
+}
diff --git a/userdiff.c b/userdiff.c
index dbfb4e1..8f5028f 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -38,6 +38,15 @@ IPATTERN("fortran",
 	 "|//|\\*\\*|::|[/<>=]="),
 IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
 	 "[^ \t-]+"),
+PATTERNS("golang",
+	 /* Functions */
+	 "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
+	 /* Structs and interfaces */
+	 "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
+	 /* -- */
+	 "[a-zA-Z_][a-zA-Z0-9_]*"
+	 "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
+	 "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
 PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
 	 "[^<>= \t]+"),
 PATTERNS("java",