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