95 lines
2.6 KiB
Nix
95 lines
2.6 KiB
Nix
# This module provides suggestions of packages to install if the user
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# tries to run a missing command in Bash. This is implemented using a
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# SQLite database that maps program names to Nix package names (e.g.,
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# "pdflatex" is mapped to "tetex").
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.programs.command-not-found;
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commandNotFound = pkgs.substituteAll {
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name = "command-not-found";
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dir = "bin";
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src = ./command-not-found.pl;
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isExecutable = true;
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inherit (pkgs) perl;
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inherit (cfg) dbPath;
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perlFlags = concatStrings (map (path: "-I ${path}/${pkgs.perl.libPrefix} ")
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[ pkgs.perlPackages.DBI pkgs.perlPackages.DBDSQLite pkgs.perlPackages.StringShellQuote ]);
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};
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in
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{
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options.programs.command-not-found = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether interactive shells should show which Nix package (if
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any) provides a missing command.
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'';
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};
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dbPath = mkOption {
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default = "/nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite" ;
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description = ''
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Absolute path to programs.sqlite.
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By default this file will be provided by your channel
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(nixexprs.tar.xz).
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'';
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type = types.path;
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};
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};
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config = mkIf cfg.enable {
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programs.bash.interactiveShellInit =
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''
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# This function is called whenever a command is not found.
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command_not_found_handle() {
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local p=${commandNotFound}/bin/command-not-found
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if [ -x $p -a -f ${cfg.dbPath} ]; then
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# Run the helper program.
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$p "$@"
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# Retry the command if we just installed it.
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if [ $? = 126 ]; then
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"$@"
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else
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return 127
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fi
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else
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echo "$1: command not found" >&2
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return 127
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fi
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}
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'';
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programs.zsh.interactiveShellInit =
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''
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# This function is called whenever a command is not found.
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command_not_found_handler() {
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local p=${commandNotFound}/bin/command-not-found
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if [ -x $p -a -f ${cfg.dbPath} ]; then
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# Run the helper program.
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$p "$@"
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# Retry the command if we just installed it.
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if [ $? = 126 ]; then
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"$@"
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fi
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else
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# Indicate than there was an error so ZSH falls back to its default handler
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echo "$1: command not found" >&2
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return 127
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fi
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}
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'';
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environment.systemPackages = [ commandNotFound ];
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};
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}
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