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https://github.com/nix-community/comma.git
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Initial
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commit
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,
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#!/bin/bash
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#
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# usage example:
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# $ , yarn --help
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# This finds a derivation providing a bin/yarn, and runs it with `nix run`.
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# If there are multiple candidates, the user chooses one using `fzy`.
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set -euo pipefail
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if [[ $# -lt 1 ]]; then
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>&2 echo "usage: , <program> [arguments]"
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exit 1
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fi
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if [[ "$1" == "--install" ]] || [[ "$1" == "-i" ]]; then
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install=1
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shift
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else
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install=""
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fi
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argv0=$1; shift
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case "${argv0}" in
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@OVERLAY_PACKAGES@)
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attr="${argv0}"
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;;
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*)
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attr="$(nix-locate --db "${NIX_INDEX_DB}" --top-level --minimal --at-root --whole-name "/bin/${argv0}")"
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if [[ "$(echo "${attr}" | wc -l)" -ne 1 ]]; then
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attr="$(echo "${attr}" | fzy)"
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fi
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;;
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esac
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if [[ -z $attr ]]; then
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>&2 echo "no match"
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exit 1
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fi
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if [[ -n $install ]]; then
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nix-env -iA "nixpkgs.${attr%%.*}"
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else
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nix run "nixpkgs.${attr}" -c "${argv0}" "$@"
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fi
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18
README.md
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18
README.md
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# ,
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Comma runs software without installing it.
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Basically it just wraps together `nix run` and `nix-index`. You stick a `,` in front of a command to
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run it from whatever location it happens to occupy in `nixpkgs` without really thinking about it.
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## Installation
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```bash
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nix-env -i -f .
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```
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## Usage
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```bash
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, cowsay neato
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```
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59
default.nix
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59
default.nix
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{ pkgs ? import <nixpkgs> { }
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, stdenv ? pkgs.stdenv
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, lib ? pkgs.lib
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, fetchurl ? pkgs.fetchurl
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, nix-index ? pkgs.nix-index
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, nix ? pkgs.nix
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, fzy ? pkgs.fzy
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, makeWrapper ? pkgs.makeWrapper
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, runCommand ? pkgs.runCommand
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# We use this to add matchers for stuff that's not in upstream nixpkgs, but is
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# in our own overlay. No fuzzy matching from multiple options here, it's just:
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# Was the command `, mything`? Run `nixpkgs.mything`.
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, overlayPackages ? []
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}:
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let
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# nix-index takes a little while to run and the contents don't change
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# meaningfully very often. This is generated by running `nix-index` and
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# uploading `~/.cache/nix-index/files` to, well, anywhere.
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indexCache = fetchurl {
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url = "https://s3.amazonaws.com/burkelibbey/nix-index-files";
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sha256 = "06p58f82wipd0a8wbc7j3l0p8iaxvdibgshmc9dbxkjf0hmln3kx";
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};
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# nix-locate needs the --db argument to be a directory containing a file
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# named "files".
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nixIndexDB = runCommand "nix-index-cache" {} ''
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mkdir $out
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ln -s ${indexCache.out} $out/files
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'';
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in
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stdenv.mkDerivation rec {
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name = "comma";
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src = ./.;
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buildInputs = [ nix-index.out nix.out fzy.out ];
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nativeBuildInputs = [ makeWrapper ];
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installPhase = let
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caseCondition = lib.concatStringsSep "|" (overlayPackages ++ [ "--placeholder--" ]);
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in ''
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mkdir -p $out/bin
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sed -e 's/@OVERLAY_PACKAGES@/${caseCondition}/' < , > $out/bin/,
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chmod +x $out/bin/,
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wrapProgram $out/bin/, \
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--set NIX_INDEX_DB ${nixIndexDB.out} \
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--prefix PATH : ${nix-index.out}/bin \
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--prefix PATH : ${nix.out}/bin \
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--prefix PATH : ${fzy.out}/bin
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ln -s $out/bin/, $out/bin/comma
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'';
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}
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