From a3396687e51569c3a35172b35bfe57daea80d3ff Mon Sep 17 00:00:00 2001
From: Mike Holloway <mike.holloway@protonmail.com>
Date: Sun, 13 Apr 2025 14:02:43 -0400
Subject: [PATCH] Arg parsing, validating

---
 icecast-ssl-helper.scm | 75 ++++++++++++++++++++++++++++++++++--------
 1 file changed, 62 insertions(+), 13 deletions(-)

diff --git a/icecast-ssl-helper.scm b/icecast-ssl-helper.scm
index a3fa446..29759b3 100644
--- a/icecast-ssl-helper.scm
+++ b/icecast-ssl-helper.scm
@@ -6,6 +6,33 @@
              (ssh key)
              (ssh version))
 
+(define *program-name* "icecast-ssl-helper")
+
+(define *default-identity-file*
+  (string-append (getenv "HOME") "/.ssh/id_rsa"))
+
+(define *default-log-verbosity* "nolog")
+
+(define %accepted-key-types "ssh-rsa,rsa-sha2-256,ssh-dss,ecdh-sha2-nistp256")
+
+(define debug? #f)
+
+(define *option-spec*
+  '((user          (single-char #\u) (value #t))
+    (port          (single-char #\p) (value #t))
+    (identity-file (single-char #\i) (value #t))
+    (help          (single-char #\h) (value #f))
+    (version       (single-char #\v) (value #f))
+    (debug         (single-char #\d) (value #f))
+    (known-hosts-file                (value #t))
+    (ssh-debug                       (value #t))))
+
+(define (print-version-and-exit)
+  "Print information about versions."
+  (format #t "libssh version:       ~a~%" (get-libssh-version))
+  (format #t "libguile-ssh version: ~a~%" (get-library-version))
+  (exit))
+
 (define (print-help-and-exit)
   "Print information about program usage."
   (display
@@ -24,20 +51,42 @@ Options:
   --ssh-debug=<verbosity>                 Debug libssh
   --version, -v                           Print version
 "))
-  (display "exit\n"))
+  (display "\n===\nFeigning exit\n"))
 
-(define *program-name* "icecast-ssl-helper")
-(define *default-identity-file*
-  (string-append (getenv "HOME") "/.ssh/id_rsa"))
-(define *default-log-verbosity* "nolog")
-
-(define %accepted-key-types "ssh-rsa,rsa-sha2-256,ssh-dss,ecdh-sha2-nistp256")
-
-(define debug? #t)
+(define args '(*program-name* "--user" "foo" "--port" "22" "host" "command"))
 
 (define (main args)
-  (cond ((not (eq? "" args))
-         (display (string-split args #\ )))
-        (else (display "Tail sequence"))))
+  (let* ((options           (getopt-long args *option-spec*))
+         (user              (option-ref options 'user (getenv "USER")))
+         (port              (string->number (option-ref options 'port "22")))
+         (identity-file     (option-ref options 'identity-file
+                                        *default-identity-file*))
+         (debug-needed?     (option-ref options 'debug #f))
+         (ssh-debug         (option-ref options 'ssh-debug
+                                        *default-log-verbosity*))
+         (known-hosts-file  (option-ref options 'known-hosts-file #f))
+         (help-needed?      (option-ref options 'help #f))
+         (version-needed?   (option-ref options 'version #f))
+         (args              (option-ref options '() #f)))
 
-(main "arg1 arg2 arg3")
+    (set! debug? debug-needed?)
+
+    (cond ((eq? #t help-needed?)
+           (print-help-and-exit))
+          ((eq? #t version-needed?)
+           (display "Version message not implemented.\n"))
+          ((or (null? user) (not (string? user)))
+           (display "User should be a string of characters.\n"))
+          ((not (number? port))
+           (display "Port must be a number.\n"))
+          ((or (null? args) (null? (cdr args)))
+           (print-help-and-exit))
+      (else (display (string-append
+                       *program-name*
+                       "\nuser = " user
+                       "\n" "port = " (number->string port)
+                       "\n" "host = " (car args)
+                       "\n" "command = " (car (cdr args))
+                       "\n"))))))
+
+(main args)