add buildHaskellApp nix function

1 files changed, 34 insertions, 0 deletions

diff --git a/com/simatime/shell.scm b/com/simatime/shell.scm
new file mode 100644
index 0000000..7c6bb5c
--- /dev/null
+++ b/com/simatime/shell.scm
@@ -0,0 +1,34 @@
+(define-module (com simatime shell)
+  #:use-module ((ice-9 popen) #:prefix popen/)
+  #:use-module ((ice-9 rdelim) #:prefix rdelim/)
+  #:use-module ((ice-9 ftw) #:prefix ftw/)
+  #:export (exec
+            stream
+            pwd
+            ls
+            cd))
+
+(define (exec cmd)
+  (let* ((port (popen/open-input-pipe cmd))
+         (ret (read port)))
+    (popen/close-pipe port)
+    ret))
+
+(define (stream cmd)
+  (let* ((port (popen/open-input-pipe cmd))
+         (_ (setvbuf port 'none))
+         (ret (rdelim/read-string port)))
+    (flush-all-ports)
+    (popen/close-pipe port)
+    ret))
+
+(define (pwd)
+  (regexp-substitute/global
+   #f "/home/ben" (getcwd) 'pre "~" 'post))
+
+(define (ls)
+  (ftw/scandir (getcwd)))
+
+(define (cd path)
+  (chdir path)
+  (ls))