Make behavior of encodeGNUCommandLine customizable

... based on feedback from @edolstra
This commit is contained in:
Gabriel Gonzalez 2019-12-13 18:25:52 -08:00
parent 8c6a05c8c9
commit 693096d283
2 changed files with 18 additions and 13 deletions

View file

@ -6,27 +6,31 @@
boilerplate related to command-line construction for simple use cases.
Example:
encodeGNUCommandLine { foo = "A"; bar = 1; baz = null; qux = true; v = true; }
encodeGNUCommandLine { } { foo = "A"; bar = 1; baz = null; qux = true; v = true; }
=> " --bar '1' --foo 'A' --qux -v"
*/
encodeGNUCommandLine =
{ renderKey ?
key: if builtins.stringLength key == 1 then "-${key}" else "--${key}"
, renderOption ?
key: value:
if value == null
then ""
else " ${renderKey key} ${lib.escapeShellArg value}"
, renderBool ? key: value: if value then " ${renderKey key}" else ""
, renderList ? key: value: lib.concatMapStrings renderOption value
}:
options:
let
render = key: value:
let
hyphenate =
k: if builtins.stringLength k == 1 then "-${k}" else "--${k}";
renderOption = v: if v == null then "" else " ${hyphenate key} ${lib.escapeShellArg v}";
renderSwitch = if value then " ${hyphenate key}" else "";
in
if builtins.isBool value
then renderSwitch
then renderBool key value
else if builtins.isList value
then lib.concatMapStrings renderOption value
else renderOption value;
then renderList key value
else renderOption key value;
in
lib.concatStrings (lib.mapAttrsToList render options);

View file

@ -444,6 +444,7 @@ runTests {
testRenderOptions = {
expr =
encodeGNUCommandLine
{ }
{ foo = "A";
bar = 1;