mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-15 09:03:48 +00:00
7228a3c0bc
Let’s call them by what they are, option names. `generators.mkValueStringDefault` is a better value string renderer than plain `toString`. Also add docs to all options.
84 lines
2.8 KiB
Nix
84 lines
2.8 KiB
Nix
{ lib }:
|
||
|
||
rec {
|
||
/* Automatically convert an attribute set to command-line options.
|
||
|
||
This helps protect against malformed command lines and also to reduce
|
||
boilerplate related to command-line construction for simple use cases.
|
||
|
||
`toGNUCommandLine` returns a list of nix strings.
|
||
`toGNUCommandLineShell` returns an escaped shell string.
|
||
|
||
Example:
|
||
cli.toGNUCommandLine {} {
|
||
data = builtins.toJSON { id = 0; };
|
||
X = "PUT";
|
||
retry = 3;
|
||
retry-delay = null;
|
||
url = [ "https://example.com/foo" "https://example.com/bar" ];
|
||
silent = false;
|
||
verbose = true;
|
||
}
|
||
=> [
|
||
"-X" "PUT"
|
||
"--data" "{\"id\":0}"
|
||
"--retry" "3"
|
||
"--url" "https://example.com/foo"
|
||
"--url" "https://example.com/bar"
|
||
"--verbose"
|
||
]
|
||
|
||
cli.toGNUCommandLineShell {} {
|
||
data = builtins.toJSON { id = 0; };
|
||
X = "PUT";
|
||
retry = 3;
|
||
retry-delay = null;
|
||
url = [ "https://example.com/foo" "https://example.com/bar" ];
|
||
silent = false;
|
||
verbose = true;
|
||
}
|
||
=> "'-X' 'PUT' '--data' '{\"id\":0}' '--retry' '3' '--url' 'https://example.com/foo' '--url' 'https://example.com/bar' '--verbose'";
|
||
*/
|
||
toGNUCommandLineShell =
|
||
options: attrs: lib.escapeShellArgs (toGNUCommandLine options attrs);
|
||
|
||
toGNUCommandLine = {
|
||
# how to string-format the option name;
|
||
# by default one character is a short option (`-`),
|
||
# more than one characters a long option (`--`).
|
||
mkOptionName ?
|
||
k: if builtins.stringLength k == 1
|
||
then "-${k}"
|
||
else "--${k}",
|
||
|
||
# how to format a boolean value to a command list;
|
||
# by default it’s a flag option
|
||
# (only the option name if true, left out completely if false).
|
||
mkBool ? k: v: lib.optional v (mkOptionName k),
|
||
|
||
# how to format a list value to a command list;
|
||
# by default the option name is repeated for each value
|
||
# and `mkOption` is applied to the values themselves.
|
||
mkList ? k: v: lib.concatMap (mkOption k) v,
|
||
|
||
# how to format any remaining value to a command list;
|
||
# on the toplevel, booleans and lists are handled by `mkBool` and `mkList`,
|
||
# though they can still appear as values of a list.
|
||
# By default, everything is printed verbatim and complex types
|
||
# are forbidden (lists, attrsets, functions). `null` values are omitted.
|
||
mkOption ?
|
||
k: v: if v == null
|
||
then []
|
||
else [ (mkOptionName k) (lib.generators.mkValueStringDefault {} v) ]
|
||
}:
|
||
options:
|
||
let
|
||
render = k: v:
|
||
if builtins.isBool v then mkBool k v
|
||
else if builtins.isList v then mkList k v
|
||
else mkOption k v;
|
||
|
||
in
|
||
builtins.concatLists (lib.mapAttrsToList render options);
|
||
}
|