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-rw-r--r--krebs/4lib/shell.nix22
1 files changed, 22 insertions, 0 deletions
diff --git a/krebs/4lib/shell.nix b/krebs/4lib/shell.nix
new file mode 100644
index 000000000..2a6da5c16
--- /dev/null
+++ b/krebs/4lib/shell.nix
@@ -0,0 +1,22 @@
+{ lib, ... }:
+
+with builtins;
+with lib;
+
+rec {
+ escape =
+ let
+ isSafeChar = c: match "[-./0-9_a-zA-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}";
+}