From 104ec07c142ac74e68ee2d72df662a0adcd5b9c5 Mon Sep 17 00:00:00 2001
From: danix <danix@danix.xyz>
Date: Thu, 11 Jun 2026 09:43:47 +0200
Subject: feat: expand_tilde helper

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 tests/wallp.bats | 11 +++++++++++
 wallp            |  9 +++++++++
 2 files changed, 20 insertions(+)

diff --git a/tests/wallp.bats b/tests/wallp.bats
index b92b3c2..1307eeb 100644
--- a/tests/wallp.bats
+++ b/tests/wallp.bats
@@ -26,3 +26,14 @@ teardown() {
 @test "harness sanity" {
   [ "x" = "x" ]
 }
+
+@test "expand_tilde expands leading tilde" {
+  run expand_tilde '~/pics/a.png'
+  [ "$status" -eq 0 ]
+  [ "$output" = "$HOME/pics/a.png" ]
+}
+
+@test "expand_tilde leaves absolute path untouched" {
+  run expand_tilde '/abs/b.png'
+  [ "$output" = "/abs/b.png" ]
+}
diff --git a/wallp b/wallp
index 2e3ef7b..31680f4 100644
--- a/wallp
+++ b/wallp
@@ -3,6 +3,15 @@
 
 set -u
 
+# Expand a leading ~ or ~/ to $HOME. Leaves other paths unchanged.
+expand_tilde() {
+  case "$1" in
+    "~") printf '%s\n' "$HOME" ;;
+    "~/"*) printf '%s\n' "$HOME/${1#\~/}" ;;
+    *) printf '%s\n' "$1" ;;
+  esac
+}
+
 main() {
   return 0
 }
-- 
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