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authormakefu <github@syntax-fehler.de>2016-08-03 09:28:59 +0200
committermakefu <github@syntax-fehler.de>2016-08-03 09:28:59 +0200
commitcba2979f860e3b55f82c58883bac84ceacd005bb (patch)
treeee421f8093206d76b61781e7777baa66816c412b /lib/shell.nix
parentb68633c0272514dd4f2d235796f87021664730c2 (diff)
parent46d73a70ce2df4af2d66228874470cb4c8657f14 (diff)
Merge remote-tracking branch 'cd/master'
Diffstat (limited to 'lib/shell.nix')
-rw-r--r--lib/shell.nix21
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/shell.nix b/lib/shell.nix
new file mode 100644
index 000000000..a8ff5dbe0
--- /dev/null
+++ b/lib/shell.nix
@@ -0,0 +1,21 @@
+{ lib, ... }:
+
+with lib;
+
+rec {
+ escape =
+ let
+ isSafeChar = c: match "[-+./0-9:=A-Z_a-z]" c != null;
+ in
+ stringAsChars (c:
+ if isSafeChar c then c
+ else if c == "\n" then "'\n'"
+ else "\\${c}");
+
+ #
+ # shell script generators
+ #
+
+ # example: "${cat (toJSON { foo = "bar"; })} | jq -r .foo"
+ cat = s: "printf '%s' ${escape s}";
+}