feat: add wttrin-display-options for wttr.in flag customization (closes #3)

wttr.in accepts single-character flags appended to the URL that control what the report looks like — no Follow line (F), narrow output (n), quiet mode (q), forecast horizon (0/1/2), console-glyph mode (d), and so on. Until now wttrin always used the same default report shape with no way to opt into these.

Added a `wttrin-display-options` defcustom that takes a string of concatenated flags, e.g. "0Fq" for current weather only with no Follow line and no header. The flags get appended to every request via `wttrin--build-url`. The defcustom defaults to nil so existing users see no change.

I excluded `A` and `T` from the recommended set in the docstring since wttrin needs ANSI output for the xterm-color rendering to produce the colored glyphs. The user could still pass them, but the docstring nudges them away.

Tests cover the normal cases (single, multi-flag, with and without unit system), the boundaries (nil and empty string both leave the URL unchanged from baseline, single character works), and a sanity check that the new flags slot in after the always-on `A`. Existing build-url tests stay green because they don't bind the new variable, and the default is nil.

Also added `.claude/` to .gitignore — the scheduled-tasks lockfile from local wakeup scheduling shouldn't be tracked.

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/test-wttrin--build-url.el b/tests/test-wttrin--build-url.el
index b19ede1..9bb514a 100644
--- a/tests/test-wttrin--build-url.el
+++ b/tests/test-wttrin--build-url.el
@@ -91,6 +91,50 @@ The @ symbol should be URL-encoded as %40."
       (should (string-prefix-p "https://wttr.in/" url))
       (should (string-match-p "%40github\\.com" url)))))
 
+;;; Display Options Cases
+
+(ert-deftest test-wttrin--build-url-normal-display-options-appended-after-A ()
+  "Display options string is appended after the A flag."
+  (let ((wttrin-unit-system nil)
+        (wttrin-display-options "0Fq"))
+    (should (string= "https://wttr.in/Paris?A0Fq"
+                     (wttrin--build-url "Paris")))))
+
+(ert-deftest test-wttrin--build-url-normal-display-options-with-unit-system ()
+  "Display options coexist with unit system, both inside the same query string."
+  (let ((wttrin-unit-system "m")
+        (wttrin-display-options "0F"))
+    (should (string= "https://wttr.in/Tokyo?mA0F"
+                     (wttrin--build-url "Tokyo")))))
+
+(ert-deftest test-wttrin--build-url-normal-display-options-narrow-quiet ()
+  "Common combination: narrow + quiet."
+  (let ((wttrin-unit-system nil)
+        (wttrin-display-options "nq"))
+    (should (string= "https://wttr.in/SFO?Anq"
+                     (wttrin--build-url "SFO")))))
+
+(ert-deftest test-wttrin--build-url-boundary-display-options-nil-omits-flags ()
+  "Nil display-options leaves URL unchanged from baseline."
+  (let ((wttrin-unit-system nil)
+        (wttrin-display-options nil))
+    (should (string= "https://wttr.in/Paris?A"
+                     (wttrin--build-url "Paris")))))
+
+(ert-deftest test-wttrin--build-url-boundary-display-options-empty-string-omits-flags ()
+  "Empty display-options string is treated like nil."
+  (let ((wttrin-unit-system nil)
+        (wttrin-display-options ""))
+    (should (string= "https://wttr.in/Paris?A"
+                     (wttrin--build-url "Paris")))))
+
+(ert-deftest test-wttrin--build-url-boundary-display-options-single-character ()
+  "Single-character display-options works."
+  (let ((wttrin-unit-system nil)
+        (wttrin-display-options "F"))
+    (should (string= "https://wttr.in/London?AF"
+                     (wttrin--build-url "London")))))
+
 ;;; Error Cases
 
 (ert-deftest test-wttrin--build-url-error-nil-query-signals-error ()