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# info.nix -- install texinfo, set INFOPATH, create `dir` file
# This is a helper for the GNU info documentation system. By default,
# the `info` command (and the Info subsystem within Emacs) gives easy
# access to the info files stored system-wide, but not info files in
# your ~/.nix-profile.
# We set $INFOPATH to include `/run/current-system/sw/share/info` and
# `~/.nix-profile/share/info` but it's not enough. Although info can
# then find files when you explicitly ask for them, it doesn't show
# them to you in the table of contents on startup. To do that requires
# a `dir` file. NixOS keeps the system-wide `dir` file up to date, but
# ignores home-installed packages.
# So this module contains an activation script that generates the
# `dir` for your home profile. Then when you start info (and both
# `dir` files are in your $INFOPATH), it will *merge* the contents of
# the two files, showing you a unified table of contents for all
# packages. This is really nice.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.programs.info;
# Indexes info files found in this location
homeInfoPath = "${config.home.profileDirectory}/share/info";
# Installs this package -- the interactive just means that it
# includes the curses `info` program. We also use `install-info`
# from this package in the activation script.
infoPkg = pkgs.texinfoInteractive;
in {
options = {
programs.info = {
enable = mkEnableOption "GNU Info";
homeInfoDirLocation = mkOption {
default = "\${XDG_CACHE_HOME:-$HOME/.cache}/info";
description = ''
Directory in which to store the info <filename>dir</filename>
file within your home.
'';
};
};
};
config = mkIf cfg.enable {
home.sessionVariables.INFOPATH =
"${cfg.homeInfoDirLocation}\${INFOPATH:+:}\${INFOPATH}";
home.activation.createHomeInfoDir =
hm.dag.entryAfter [ "installPackages" ] ''
oPATH=$PATH
export PATH="${lib.makeBinPath [ pkgs.gzip ]}''${PATH:+:}$PATH"
$DRY_RUN_CMD mkdir -p "${cfg.homeInfoDirLocation}"
$DRY_RUN_CMD rm -f "${cfg.homeInfoDirLocation}/dir"
if [[ -d "${homeInfoPath}" ]]; then
find -L "${homeInfoPath}" \( -name '*.info' -o -name '*.info.gz' \) \
-exec $DRY_RUN_CMD ${infoPkg}/bin/install-info '{}' \
"${cfg.homeInfoDirLocation}/dir" \;
fi
export PATH="$oPATH"
unset oPATH
'';
home.packages = [ infoPkg ];
home.extraOutputsToInstall = [ "info" ];
};
}
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