From bea23f0bf1a41292e77caab5a07de0b50eff5546 Mon Sep 17 00:00:00 2001
From: Knut Ahlers <knut@ahlers.me>
Date: Wed, 30 Mar 2022 21:10:35 +0200
Subject: [PATCH] Add basic string manipulation `join` and `split`

Signed-off-by: Knut Ahlers <knut@ahlers.me>
---
 README.md                 | 12 ++++++++++++
 functions/func_strings.go |  8 ++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 functions/func_strings.go

diff --git a/README.md b/README.md
index 2f7484c..208b51a 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,12 @@
   $ echo '{{ hash "sha256" "this is a test" }}' | korvike
   2e99758548972a8e8822ad47fa1017ff72f06f3ff6a016851f45c398732bc50c
   ```
+- `{{ join <string> <delim> }}`  
+  Joins the given slice of strings with given delimiter.
+  ```console
+  $ echo '{{ join (split "a,b,c" ",") "|" }}' | korvike
+  a|b|c
+  ```
 - `{{ markdown <source> }}`  
   Format the source using a markdown parser
   ```console
@@ -59,6 +65,12 @@
   $ echo '{{ now "2006-01-02 15:04:05" }}' | korvike
   2017-04-17 16:27:34
   ```
+- `{{ split <string> <sep> }}`  
+  Splits the given string by given separator.
+  ```console
+  $ echo '{{ range (split "a,b,c" ",") }}{{ . }} {{ end }}' | korvike
+  a b c
+  ```
 - `{{ tplexec (file "my.tpl") }}`  
   Execute the given template with the same function set and variables as the parent template.
   ```console
diff --git a/functions/func_strings.go b/functions/func_strings.go
new file mode 100644
index 0000000..b1b6739
--- /dev/null
+++ b/functions/func_strings.go
@@ -0,0 +1,8 @@
+package functions
+
+import "strings"
+
+func init() {
+	registerFunction("join", strings.Join)
+	registerFunction("split", strings.Split)
+}