lib shell.escape: escape the empty string as ''

2017-09-19 20:42:27 +02:00 · 2017-09-19 20:42:27 +02:00 · 8179f87e5a
commit 8179f87e5a
parent 3416a45b54
1 changed files with 7 additions and 4 deletions
--- a/lib/shell.nix
+++ b/lib/shell.nix
@ -7,10 +7,13 @@ rec {
    let
      isSafeChar = testString "[-+./0-9:=A-Z_a-z]";
    in
-    stringAsChars (c:
-      if isSafeChar c then c
-      else if c == "\n" then "'\n'"
-      else "\\${c}");
+      x:
+        if x == "" then "''"
+        else stringAsChars (c:
+          if isSafeChar c then c
+          else if c == "\n" then "'\n'"
+          else "\\${c}"
+        ) x;

  #
  # shell script generators