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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
commit450545461badca9da4724a2e8b8e2370bd03b534 (patch)
treeeacdd6378494318d302f08a46b0c17d05edb55a4
parentf4191880ae59834414f983cec198d0732b9c2faf (diff)
lib: import shell from krebs/4lib
-rw-r--r--lib/default.nix7
-rw-r--r--lib/shell.nix21
2 files changed, 28 insertions, 0 deletions
diff --git a/lib/default.nix b/lib/default.nix
new file mode 100644
index 0000000..6c607f1
--- /dev/null
+++ b/lib/default.nix
@@ -0,0 +1,7 @@
+let
+ lib = import <nixpkgs/lib> // builtins // {
+ shell = import ./shell.nix { inherit lib; };
+ };
+in
+
+lib
diff --git a/lib/shell.nix b/lib/shell.nix
new file mode 100644
index 0000000..a8ff5db
--- /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}";
+}