feat: parse_conf key=value config loader

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

2 files changed, 36 insertions, 0 deletions

diff --git a/tests/wallp.bats b/tests/wallp.bats
index 1307eeb..3445ddb 100644
--- a/tests/wallp.bats
+++ b/tests/wallp.bats
@@ -37,3 +37,20 @@ teardown() {
   run expand_tilde '/abs/b.png'
   [ "$output" = "/abs/b.png" ]
 }
+
+@test "parse_conf reads keys and expands tilde in paths" {
+  conf="$HOME/c.conf"
+  printf '%s\n' \
+    '# comment' '' \
+    'THEME=mytheme' \
+    'OUTPUT_H=DP-1' \
+    'OUTPUT_V=DP-3' \
+    'DEFAULT_H=~/p/h.png' \
+    'DEFAULT_V=/abs/v.png' > "$conf"
+  parse_conf "$conf"
+  [ "$CONF_THEME" = "mytheme" ]
+  [ "$CONF_OUTPUT_H" = "DP-1" ]
+  [ "$CONF_OUTPUT_V" = "DP-3" ]
+  [ "$CONF_DEFAULT_H" = "$HOME/p/h.png" ]
+  [ "$CONF_DEFAULT_V" = "/abs/v.png" ]
+}
diff --git a/wallp b/wallp
index 31680f4..f7cf70b 100644
--- a/wallp
+++ b/wallp
@@ -12,6 +12,25 @@ expand_tilde() {
   esac
 }
 
+# Parse key=value conf into CONF_* globals. Ignores blanks and #-comments.
+# Expands ~ in DEFAULT_* path values. Does not validate (see require_conf_keys).
+CONF_THEME="" CONF_OUTPUT_H="" CONF_OUTPUT_V="" CONF_DEFAULT_H="" CONF_DEFAULT_V=""
+parse_conf() {
+  local file="$1" line key val
+  while IFS= read -r line || [ -n "$line" ]; do
+    case "$line" in ''|'#'*) continue ;; esac
+    key="${line%%=*}"
+    val="${line#*=}"
+    case "$key" in
+      THEME)     CONF_THEME="$val" ;;
+      OUTPUT_H)  CONF_OUTPUT_H="$val" ;;
+      OUTPUT_V)  CONF_OUTPUT_V="$val" ;;
+      DEFAULT_H) CONF_DEFAULT_H="$(expand_tilde "$val")" ;;
+      DEFAULT_V) CONF_DEFAULT_V="$(expand_tilde "$val")" ;;
+    esac
+  done < "$file"
+}
+
 main() {
   return 0
 }