Started switch to Guile Scheme

I want to learn it more than I want to learn Lua right now.

And I won't have time for both once the problems are more difficult.

1 files changed, 32 insertions, 0 deletions

diff --git a/main.scm b/main.scm
new file mode 100644
index 0000000..bcbadda
--- /dev/null
+++ b/main.scm
@@ -0,0 +1,32 @@
+(use-modules (ice-9 format) (ice-9 regex))
+
+(define args (program-arguments))
+
+(unless (<= 2 (length args) 3)
+  (error (format #f "Syntax: ~a <DAY><a|b> [INFILE]\n"))
+  (exit 1))
+
+(define mtch (string-match "^([0-9]+)(a|b)$" (list-ref args 1)))
+
+(unless mtch
+  (error (format #f "Expected day and part (like \"03a\" or \"02b\"), got: ~a"
+                 (list-ref args 1))))
+
+(define day (format #f "~2,'0d" (string->number (match:substring mtch 1))))
+(define part (if (string= (match:substring mtch 2) "a") 'part1 'part2))
+
+(set! %load-path (cons "." %load-path))
+
+(define day-module
+  (resolve-module (list (string->symbol (string-append "day" day)))))
+(define func (module-ref day-module part))
+
+(define input-file
+  (cond ((= (length args) 2) (string-append day ".in"))
+        ((string= (list-ref args 2) "-") #f)
+        (else (list-ref args 2))))
+
+(display (if input-file
+             (call-with-input-file input-file func)
+             (func (current-input-port))))
+(newline)