Define {builder,fs}.nix for utils.nix
Re-export everything from utils.nix.
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3 changed files with 63 additions and 11 deletions
11
utils/builder.nix
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11
utils/builder.nix
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{ pkgs, ... }:
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let
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inherit (pkgs) writeShellScriptBin;
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in {
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# Create a derivation that creates an executable shell script named `as` that
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# calls the program located at `path`, forwarding all of the arguments.
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wrapNonNixProgram = { path, as }: writeShellScriptBin as ''
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exec ${path} "$@"
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'';
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}
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@ -1,14 +1,14 @@
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{ pkgs, ... }:
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args@{ pkgs, ... }:
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# Using this as a library to define some common utility functions that I often
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# This top-level module exposes all of my utility functions for Nix. It should
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# reach for.
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# be used like:
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{
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# ```nix
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# A unary function that returns its argument.
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# inherit (briefcase.utils) fs;
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identity = x: x;
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# ```
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# Create a derivation that creates an executable shell script named `as` that
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let
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# calls the program located at `path`, forwarding all of the arguments.
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builder = import ./builder.nix args;
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wrapNonNixProgram = { path, as }: pkgs.writeShellScriptBin as ''
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fs = import ./fs.nix args;
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exec ${path} "$@"
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in {
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'';
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inherit builder fs;
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}
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}
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41
utils/fs.nix
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utils/fs.nix
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{ pkgs, ... }:
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# `fs` contains utility functions for working with the filesystem.
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let
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inherit (builtins) attrNames hasAttr map readDir;
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inherit (pkgs.lib) filterAttrs;
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in {
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# Returns a list of all of the regular files in `dir`.
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files = dir:
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map (name: dir + "/${name}")
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(attrNames
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(filterAttrs (_: type: type == "regular") (readDir dir)));
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# Returns a list of all of the directories in `dir`.
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dirs = dir:
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map (name: dir + "/${name}")
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(attrNames
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(filterAttrs (_: type: type == "directory") (readDir dir)));
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# Returns a list of paths to all of the `name` files starting at `dir`.
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find = name: dir:
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if hasAttr name (readDir dir) then
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[ (dir + name) ] ++ concatMap findAllDefaultNix (dirs dir)
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else
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concatMap findAllDefaultNix (dirs dir);
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# Looks for `name` in `dir`; if it cannot find it, it checks the parent
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# directory.
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resolve = name: dir:
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if hasAttr name (readDir dir) then
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dir + "/${name}"
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else
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# This prevents the function from infinitely recursing and eventually
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# stack overflowing.
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if (dirOf dir) == dir then
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null
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else
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resolve name (dirOf dir);
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};
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}
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