From 6d3a0e96ae46618da1ff0b8cf26bec467922336d Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Tue, 5 Mar 2024 02:52:01 +0100
Subject: [PATCH] feat: Add replaceAll function

---
 docs/templatefuncs.md | 10 ++++++++++
 templatefuncs.go      |  8 ++++++++
 templatefuncs_test.go |  8 ++++++++
 3 files changed, 26 insertions(+)

diff --git a/docs/templatefuncs.md b/docs/templatefuncs.md
index 0a41b79..4d9a362 100644
--- a/docs/templatefuncs.md
+++ b/docs/templatefuncs.md
@@ -142,6 +142,16 @@ with *replacement* in *string*.
 far
 ```
 
+## `replaceAll` *old* *new* *string*
+
+`replaceAll` replaces all instances of *old* with *new* in *string*.
+
+```text
+{{ "abcba" | replaceAll "b" "d" }}
+
+adcda
+```
+
 ## `stat` *path*
 
 `stat` returns a map representation of executing
diff --git a/templatefuncs.go b/templatefuncs.go
index 812fb1e..b14e136 100644
--- a/templatefuncs.go
+++ b/templatefuncs.go
@@ -43,6 +43,7 @@ func NewFuncMap() template.FuncMap {
 		"prefixLines":      prefixLinesTemplateFunc,
 		"quote":            eachString(strconv.Quote),
 		"regexpReplaceAll": regexpReplaceAllTemplateFunc,
+		"replaceAll":       replaceAllTemplateFunc,
 		"stat":             eachString(statTemplateFunc),
 		"toJSON":           toJSONTemplateFunc,
 		"toLower":          eachString(strings.ToLower),
@@ -145,6 +146,13 @@ func prefixLinesTemplateFunc(prefix, s string) string {
 	return builder.String()
 }
 
+// replaceAllTemplateFunc is the `replaceAll` template function.
+func replaceAllTemplateFunc(old, new string, v any) any {
+	return eachString(func(s string) any {
+		return strings.ReplaceAll(s, old, new)
+	})(v)
+}
+
 // regexpReplaceAllTemplateFunc is the core implementation of the
 // `regexpReplaceAll` template function.
 func regexpReplaceAllTemplateFunc(expr, repl, s string) string {
diff --git a/templatefuncs_test.go b/templatefuncs_test.go
index 72029dd..5a13fa6 100644
--- a/templatefuncs_test.go
+++ b/templatefuncs_test.go
@@ -118,6 +118,14 @@ func TestFuncMap(t *testing.T) {
 				"# b",
 			),
 		},
+		{
+			template: `{{ "abcba" | replaceAll "b" "d" }}`,
+			expected: `adcda`,
+		},
+		{
+			template: `{{ list "abc" "cba" | replaceAll "b" "d" }}`,
+			expected: "[adc cda]",
+		},
 		{
 			template: `{{ quote "a" }}`,
 			expected: `"a"`,