main: Exit on Control-c

Use `with-user-abort` to exit on a Control-c SIGINT.

Used the following tutorial for inspiration:
https://stevelosh.com/blog/2021/03/small-common-lisp-cli-programs/#s12-errors

Apparently Control-c should exit with code 130 according to this:
https://tldp.org/LDP/abs/html/exitcodes.html

Followed these Stack Overflow answers to turn off the interactive
debugger in an implementation independent way:
https://stackoverflow.com/questions/3074586/how-to-turn-off-the-debugger-in-sbcl/3074698#3074698
https://stackoverflow.com/questions/69280179/unmatched-close-parenthesis-when-sbcl-debugger-is-turned-off

This still opens the interactive debugger if Control-c is pressed before
`(main)` is called, but I don't know if there's any way to prevent that.

3 files changed, 29 insertions, 6 deletions

diff --git a/src/main.lisp b/src/main.lisp
index bd1e774..6076da7 100644
--- a/src/main.lisp
+++ b/src/main.lisp
@@ -1,7 +1,5 @@
 (in-package :wajir)
 
-(defparameter uiop:*lisp-interaction* nil)
-
 (defun main ()
   ;; Query page of issues
   ;; Start watching issue
@@ -10,8 +8,31 @@
 
   ;; TODO: Add SIGINT and error handling
 
-  (let ((config (parse-options)))
-    (run config)))
+  ;; Disable interactive debugger.
+  ; (defparameter uiop:*lisp-interaction* nil)
+  (setf *debugger-hook* #'debug-ignore)
+
+  (handler-case
+      (interrupt:with-user-abort
+        (handler-bind ((error #'(lambda (e)
+                                  (exit-with-error e sysexits:+unavailable+))))
+
+  ; (let ((config (parse-options)))
+  ;   (run config))
+
+          (format t "l-i: ~S~%" uiop:*lisp-interaction*)
+          (format t "main ran~%")
+          (sleep 5)))
+
+    ;; Control-c
+    (interrupt:user-abort ()
+      (format t "siginted~%")
+      (opts:exit 130))))
+
+(defun debug-ignore (condition hook)
+  (declare (ignore hook))
+  (princ condition)
+  (abort))
 
 (defun run (config)
   (let ((basic-auth-token (cl-base64:string-to-base64-string
diff --git a/src/package.lisp b/src/package.lisp
index c48ccba..1b3ea43 100644
--- a/src/package.lisp
+++ b/src/package.lisp
@@ -1,6 +1,7 @@
 (defpackage :wajir
   (:use :cl)
 
-  (:local-nicknames (:jzon :com.inuoe.jzon))
+  (:local-nicknames (:interrupt :with-user-abort)
+                    (:jzon :com.inuoe.jzon))
 
   (:export :main))
diff --git a/wajir.asd b/wajir.asd
index e050c93..3d9023c 100644
--- a/wajir.asd
+++ b/wajir.asd
@@ -15,7 +15,8 @@
                :com.inuoe.jzon
                :dexador
                :sysexits
-               :unix-opts)
+               :unix-opts
+               :with-user-abort)
   :components ((:module "src"
                 :serial t
                 :components ((:file "package")