add buildHaskellApp nix function

1 files changed, 24 insertions, 0 deletions

diff --git a/com/simatime/string.scm b/com/simatime/string.scm
new file mode 100644
index 0000000..01c5a70
--- /dev/null
+++ b/com/simatime/string.scm
@@ -0,0 +1,24 @@
+(define-module (com simatime string)
+  #:export (replace to-string str capitalize))
+
+(define (replace s match repl)
+  (let ((f (lambda (a b)
+             (let ((next-char (if (eq? a match) repl a)))
+               (string-concatenate (list b (string next-char)))))))
+    (string-fold f "" s)))
+
+(define (to-string x)
+  (format #f "~a" x))
+
+(define str
+  (case-lambda
+    (() "")
+    ((x) (to-string x))
+    ((x . rest) (string-concatenate (map str (cons x rest))))))
+
+(define (capitalize s)
+  (let ((s (to-string s)))
+    (if (< (string-length s) 2)
+        (string-upcase s)
+        (str (string-upcase (substring s 0 1))
+             (substring s 1 )))))