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authortv <tv@krebsco.de>2016-08-02 20:24:45 +0200
committertv <tv@krebsco.de>2016-08-02 20:24:45 +0200
commitaa167d3e26bd4fd0fedc1ea94b7069cca2100181 (patch)
tree26078465cdae6a684ef086919745473950ee4870 /lib/shell.nix
parent6a91d7257b994d9a56e40bf1cd0af78f79473fd7 (diff)
lib: import shell from krebs/4lib
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}";
+}