stockholm/lib/shell.nix

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{ 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}");
2015-08-28 20:11:03 +02:00
#
# shell script generators
#
# example: "${cat (toJSON { foo = "bar"; })} | jq -r .foo"
cat = s: "printf '%s' ${escape s}";
}