lib: add shell.quote

2018-07-12 14:14:47 +02:00 · 2018-07-12 14:14:47 +02:00 · 50868155fd
parent e8505f71ff
commit 50868155fd
1 changed files with 10 additions and 0 deletions
--- a/lib/default.nix
+++ b/lib/default.nix
@ -51,6 +51,16 @@ let {
      path = default "/var/src" /* no default? */ (elemAt' parse 6);
    };

+    shell = let
+      isSafeChar = lib.testString "[-+./0-9:=A-Z_a-z]";
+      quoteChar = c:
+        if isSafeChar c then c
+        else if c == "\n" then "'\n'"
+        else "\\${c}";
+    in {
+      quote = x: if x == "" then "''" else lib.stringAsChars quoteChar x;
+    };
+
    test = re: x: lib.isString x && lib.testString re x;
    testString = re: x: lib.match re x != null;