Merge pull request #4 from krancour/add-string-contains

Added string contains function.

README.md

@@ -87,6 +87,7 @@ HELLO!HELLO!HELLO!HELLO!HELLO!
   - wrap: Wrap text at the given column count
   - wrapWith: Wrap text at the given column count, and with the given
     string for a line terminator: `wrap 50 "\n\t" $string`
+  - contains: strings.Contains, but with the arguments switched: `contains substr str`. (This simplifies common pipelines)
 
 ### String Slice Functions:
 

functions.go

@@ -42,6 +42,7 @@ String Functions
 	- randNumeric: Given a length, generate a string of digits.
 	- wrap: Force a line wrap at the given width. `wrap 80 "imagine a longer string"`
 	- wrapWith: Wrap a line at the given length, but using 'sep' instead of a newline. `wrapWith 50, "<br>", $html`
+	- contains: strings.Contains, but with the arguments switched: `contains substr str`. (This simplifies common pipelines)
 
 String Slice Functions:
 
@@ -176,6 +177,8 @@ var genericMap = map[string]interface{}{
 	"swapcase":     util.SwapCase,
 	"wrap":         func(l int, s string) string { return util.Wrap(s, l) },
 	"wrapWith":     func(l int, sep, str string) string { return util.WrapCustom(str, l, sep, true) },
+	// Switch order so that "foobar" | contains "foo"
+	"contains": func(substr string, str string) bool { return strings.Contains(str, substr) },
 
 	// Wrap Atoi to stop errors.
 	"atoi": func(a string) int { i, _ := strconv.Atoi(a); return i },

functions_test.go

@@ -191,6 +191,13 @@ func TestRandom(t *testing.T) {
 
 }
 
+func TestContains(t *testing.T) {
+	tpl := `{{"foobar" | contains "foo"}}`
+	if err := runt(tpl, "true"); err != nil {
+		t.Error(err)
+	}
+}
+
 func runt(tpl, expect string) error {
 	return runtv(tpl, expect, "")
 }