feat: theme resolution + persistence

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2 files changed, 42 insertions, 0 deletions

diff --git a/tests/wallp.bats b/tests/wallp.bats
index 298067f..0ffed89 100644
--- a/tests/wallp.bats
+++ b/tests/wallp.bats
@@ -80,3 +80,28 @@ teardown() {
   [ "$?" -eq 0 ]
   [ "$CONF_THEME" = "sexy-splurge" ]
 }
+
+@test "resolve_theme flag wins over all" {
+  CONF_THEME="conf"; mkdir -p "$HOME/.config/wallp"
+  echo persisted > "$HOME/.config/wallp/theme"
+  run resolve_theme flagged
+  [ "$output" = "flagged" ]
+}
+
+@test "resolve_theme persisted beats conf" {
+  CONF_THEME="conf"; mkdir -p "$HOME/.config/wallp"
+  echo persisted > "$HOME/.config/wallp/theme"
+  run resolve_theme ''
+  [ "$output" = "persisted" ]
+}
+
+@test "resolve_theme uses conf when no persisted" {
+  CONF_THEME="conf"
+  run resolve_theme ''
+  [ "$output" = "conf" ]
+}
+
+@test "persist_theme writes the file" {
+  persist_theme "abc"
+  [ "$(cat "$HOME/.config/wallp/theme")" = "abc" ]
+}
diff --git a/wallp b/wallp
index fc1ed99..6f14341 100644
--- a/wallp
+++ b/wallp
@@ -78,6 +78,23 @@ load_conf() {
   return 0
 }
 
+theme_file() { printf '%s\n' "$HOME/.config/wallp/theme"; }
+
+persist_theme() {
+  local f; f="$(theme_file)"
+  mkdir -p "$(dirname "$f")"
+  printf '%s\n' "$1" > "$f"
+}
+
+# Precedence: flag arg > persisted file > CONF_THEME > sexy-splurge.
+resolve_theme() {
+  local flag="$1" f; f="$(theme_file)"
+  if [ -n "$flag" ]; then printf '%s\n' "$flag"; return; fi
+  if [ -s "$f" ]; then head -n1 "$f"; return; fi
+  if [ -n "${CONF_THEME:-}" ]; then printf '%s\n' "$CONF_THEME"; return; fi
+  printf '%s\n' "sexy-splurge"
+}
+
 main() {
   return 0
 }