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|
# This module provides suggestions of packages to install if the user
# tries to run a missing command in Bash. This is implemented using a
# SQLite database that maps program names to Nix package names (e.g.,
# "pdflatex" is mapped to "tetex").
{ config, lib, pkgs, ... }:
with lib;
let
commandNotFound = pkgs.substituteAll {
name = "command-not-found";
dir = "bin";
src = ./command-not-found.pl;
isExecutable = true;
inherit (pkgs) perl;
perlFlags = concatStrings (map (path: "-I ${path}/lib/perl5/site_perl ")
[ pkgs.perlPackages.DBI pkgs.perlPackages.DBDSQLite ]);
};
in
{
programs.bash.interactiveShellInit =
''
# This function is called whenever a command is not found.
command_not_found_handle() {
local p=/run/current-system/sw/bin/command-not-found
if [ -x $p -a -f /nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite ]; then
# Run the helper program.
$p "$1"
# Retry the command if we just installed it.
if [ $? = 126 ]; then
"$@"
else
return 127
fi
else
echo "$1: command not found" >&2
return 127
fi
}
'';
environment.systemPackages = [ commandNotFound ];
# TODO: tab completion for uninstalled commands! :-)
}
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