29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
51 lines
1.3 KiB
Nix
51 lines
1.3 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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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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perlFlags = concatStrings (map (path: "-I ${path}/lib/perl5/site_perl ")
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[ pkgs.perlPackages.DBI pkgs.perlPackages.DBDSQLite ]);
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};
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in
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{
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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=/run/current-system/sw/bin/command-not-found
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if [ -x $p -a -f /nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite ]; then
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# Run the helper program.
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$p "$1"
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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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environment.systemPackages = [ commandNotFound ];
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# TODO: tab completion for uninstalled commands! :-)
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}
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