refactor(nix/escapeExecline): move into own directory r/1131

The escaping functions are going to be used by both `writeExecline`
and `runExecline`, so let’s move them to their own namespace.

Change-Id: Iccf69eaeca3062573e0751a17c548b7def86196d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/706
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: Kane York <rikingcoding@gmail.com>

3 files changed, 34 insertions, 30 deletions

diff --git a/nix/escapeExecline/OWNERS b/nix/escapeExecline/OWNERS
new file mode 100644
index 0000000000..a742d0d22b
--- /dev/null
+++ b/nix/escapeExecline/OWNERS
@@ -0,0 +1,3 @@
+inherited: true
+owners:
+  - Profpatsch
diff --git a/nix/escapeExecline/default.nix b/nix/escapeExecline/default.nix
new file mode 100644
index 0000000000..deef5c2c4e
--- /dev/null
+++ b/nix/escapeExecline/default.nix
@@ -0,0 +1,29 @@
+{ lib, ... }:
+let
+  # replaces " and \ to \" and \\ respectively and quote with "
+  # e.g.
+  #   a"b\c -> "a\"b\\c"
+  #   a\"bc -> "a\\\"bc"
+  escapeExeclineArg = arg:
+    ''"${builtins.replaceStrings [ ''"'' ''\'' ] [ ''\"'' ''\\'' ] (toString arg)}"'';
+
+  # Escapes an execline (list of execline strings) to be passed to execlineb
+  # Give it a nested list of strings. Nested lists are interpolated as execline
+  # blocks ({}).
+  # Everything is quoted correctly.
+  #
+  # Example:
+  #   escapeExecline [ "if" [ "somecommand" ] "true" ]
+  #   == ''"if" { "somecommand" } "true"''
+  escapeExecline = execlineList: lib.concatStringsSep " "
+    (let
+      go = arg:
+        if      builtins.isString arg then [(escapeExeclineArg arg)]
+        else if builtins.isPath arg then [(escapeExeclineArg "${arg}")]
+        else if lib.isDerivation arg then [(escapeExeclineArg arg)]
+        else if builtins.isList arg then [ "{" ] ++ builtins.concatMap go arg ++ [ "}" ]
+        else abort "escapeExecline can only hande nested lists of strings, was ${lib.generators.toPretty {} arg}";
+     in builtins.concatMap go execlineList);
+
+in
+escapeExecline
diff --git a/nix/writeExecline/default.nix b/nix/writeExecline/default.nix
index 0916e2d58e..49bc416094 100644
--- a/nix/writeExecline/default.nix
+++ b/nix/writeExecline/default.nix
@@ -1,4 +1,4 @@
-{ pkgs, lib, ... }:
+{ pkgs, depot, ... }:
 
 # Write an execline script, represented as nested nix lists.
 # Everything is escaped correctly.
@@ -6,34 +6,6 @@
 
 # TODO(Profpatsch) upstream into nixpkgs
 
-let
-  # replaces " and \ to \" and \\ respectively and quote with "
-  # e.g.
-  #   a"b\c -> "a\"b\\c"
-  #   a\"bc -> "a\\\"bc"
-  escapeExeclineArg = arg:
-    ''"${builtins.replaceStrings [ ''"'' ''\'' ] [ ''\"'' ''\\'' ] (toString arg)}"'';
-
-  # Escapes an execline (list of execline strings) to be passed to execlineb
-  # Give it a nested list of strings. Nested lists are interpolated as execline
-  # blocks ({}).
-  # Everything is quoted correctly.
-  #
-  # Example:
-  #   escapeExecline [ "if" [ "somecommand" ] "true" ]
-  #   == ''"if" { "somecommand" } "true"''
-  escapeExecline = execlineList: lib.concatStringsSep " "
-    (let
-      go = arg:
-        if      builtins.isString arg then [(escapeExeclineArg arg)]
-        else if builtins.isPath arg then [(escapeExeclineArg "${arg}")]
-        else if lib.isDerivation arg then [(escapeExeclineArg arg)]
-        else if builtins.isList arg then [ "{" ] ++ builtins.concatMap go arg ++ [ "}" ]
-        else abort "escapeExecline can only hande nested lists of strings, was ${lib.generators.toPretty {} arg}";
-     in builtins.concatMap go execlineList);
-
-in
-
 name:
 {
   # "var": substitute readNArgs variables and start $@
@@ -63,5 +35,5 @@ in
   # TODO(Profpatsch): rewrite `writeScript` with `runExecline`
   pkgs.writeScript name ''
     #!${pkgs.execline}/bin/execlineb -W${env}
-    ${escapeExecline argList}
+    ${depot.nix.escapeExecline argList}
   ''