home-manager: add Bash completion
This commit is contained in:
Sam Boosalis
Robert Helgesson
parent
e25113bcf0
commit
2211770d8b
343
home-manager/completion.bash
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343
home-manager/completion.bash
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#!/bin/env bash
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##################################################
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# « home-manager » command-line completion
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#
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# © 2019 "Sam Boosalis" <samboosalis@gmail.com>
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#
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# MIT License
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#
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##################################################
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# Contributing:
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# Compatibility — Bash 3.
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#
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# OSX won't update Bash 3 (last updated circa 2009) to Bash 4,
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# and we'd like this completion script to work on both Linux and Mac.
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#
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# For example, OSX Yosemite (released circa 2014) ships with Bash 3:
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#
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# $ echo $BASH_VERSION
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# 3.2
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#
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# While Ubuntu LTS 14.04 (a.k.a. Trusty, also released circa 2016)
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# ships with the latest version, Bash 4 (updated circa 2016):
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#
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# $ echo $BASH_VERSION
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# 4.3
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#
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# Testing
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#
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# (1) Invoke « shellcheck »
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#
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# * source: « https://github.com/koalaman/shellcheck »
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# * run: « shellcheck ./share/bash-completion/completions/home-manager »
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#
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# (2) Interpret via Bash 3
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#
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# * run: « bash --noprofile --norc ./share/bash-completion/completions/home-manager »
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#
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##################################################
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# Examples:
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# $ home-manager <TAB>
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#
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# -A
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# -I
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# -f
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# -h
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# -n
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# -v
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# build
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# edit
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# expire-generations
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# generations
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# help
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# news
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# packages
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# remove-generations
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# switch
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# $ home-manager e<TAB>
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#
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# edit
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# expire-generations
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# $ home-manager remove-generations 20<TAB>
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#
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# 200
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# 201
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# 202
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# 203
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##################################################
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# Notes:
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# « home-manager » Subcommands:
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#
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# help
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# edit
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# build
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# switch
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# generations
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# remove-generations
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# expire-generations
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# packages
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# news
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# « home-manager » Options:
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#
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# -f FILE
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# -A ATTRIBUTE
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# -I PATH
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# -v
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# -n
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# -h
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# $ home-manager
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#
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# Usage: /home/sboo/.nix-profile/bin/home-manager [OPTION] COMMAND
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#
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# Options
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#
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# -f FILE The home configuration file.
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# Default is '~/.config/nixpkgs/home.nix'.
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# -A ATTRIBUTE Optional attribute that selects a configuration
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# expression in the configuration file.
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# -I PATH Add a path to the Nix expression search path.
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# -v Verbose output
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# -n Do a dry run, only prints what actions would be taken
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# -h Print this help
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#
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# Commands
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#
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# help Print this help
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#
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# edit Open the home configuration in $EDITOR
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#
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# build Build configuration into result directory
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#
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# switch Build and activate configuration
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#
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# generations List all home environment generations
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#
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# remove-generations ID...
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# Remove indicated generations. Use 'generations' command to
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# find suitable generation numbers.
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#
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# expire-generations TIMESTAMP
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# Remove generations older than TIMESTAMP where TIMESTAMP is
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# interpreted as in the -d argument of the date tool. For
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# example "-30 days" or "2018-01-01".
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#
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# packages List all packages installed in home-manager-path
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#
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# news Show news entries in a pager
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#
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##################################################
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# Dependencies:
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command -v home-manager >/dev/null
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command -v grep >/dev/null
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command -v sed >/dev/null
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##################################################
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# Code:
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_home-manager_list-generation-identifiers ()
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{
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home-manager generations | sed -n -e 's/^................ : id \([[:alnum:]]\+\) -> .*/\1/p'
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}
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# NOTES
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#
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# (1) the « sed -n -e 's/.../.../p' » invocation:
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#
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# * the « -e '...' » option takes a Sed Script.
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# * the « -n » option only prints when « .../p » would print.
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# * the « s/xxx/yyy/ » Sed Script substitutes « yyy » whenever « xxx » is matched.
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#
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# (2) the « '^................ : id \([[:alnum:]]\+\) -> .*' » regular expression:
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#
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# * matches « 199 », for example, in the line « 2019-03-13 15:26 : id 199 -> /nix/store/mv619y9pzgsx3kndq0q7fjfvbqqdy5k8-home-manager-generation »
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#
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#
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#------------------------------------------------#
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# shellcheck disable=SC2120
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_home-manager_list-nix-attributes ()
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{
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local HomeFile
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local HomeAttrsString
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# local HomeAttrsArray
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# local HomeAttr
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if [ -z "$1" ]
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then
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HomeFile=$(readlink -f "$(_home-manager_get-default-home-file)")
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else
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HomeFile="$1"
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fi
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HomeAttrsString=$(nix-instantiate --eval -E "let home = import ${HomeFile}; in (builtins.trace (builtins.toString (builtins.attrNames home)) null)" |& grep '^trace: ')
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HomeAttrsString="${HomeAttrsString#trace: }"
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echo "${HomeAttrsString}"
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# IFS=" " read -ar HomeAttrsArray <<< "${HomeAttrsString}"
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#
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# local HomeAttr
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# for HomeAttr in "${HomeAttrsArray[@]}"
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# do
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# echo "${HomeAttr}"
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# done
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}
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# e.g.:
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#
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# $ nix-instantiate --eval -E 'let home = import /home/sboo/configuration/configs/nixpkgs/home-attrs.nix; in (builtins.trace (builtins.toString (builtins.attrNames home)) null)' 1>/dev/null
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# trace: darwin linux
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#
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# $ _home-manager_list-nix-attributes
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# linux darwin
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#
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#------------------------------------------------#
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_home-manager_get-default-home-file ()
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{
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local HomeFileDefault
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HomeFileDefault="$(_home-manager_xdg-get-config-home)/nixpkgs/home.nix"
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echo "${HomeFileDefault}"
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}
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# e.g.:
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#
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# $ _home-manager_get-default-home-file
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# ~/.config/nixpkgs/home.nix
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#
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##################################################
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# XDG-BaseDirs:
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_home-manager_xdg-get-config-home () {
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echo "${XDG_CONFIG_HOME:-$HOME/.config}"
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}
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#------------------------------------------------#
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_home-manager_xdg-get-data-home () {
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echo "${XDG_DATA_HOME:-$HOME/.local/share}"
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}
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#------------------------------------------------#
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_home-manager_xdg-get-cache-home () {
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echo "${XDG_CACHE_HOME:-$HOME/.cache}"
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}
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##################################################
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# shellcheck disable=SC2207
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_home-manager_completions ()
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{
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#--------------------------#
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local Subcommands
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Subcommands=( "help" "edit" "build" "switch" "generations" "remove-generations" "expire-generations" "packages" "news" )
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# ^ « home-manager »'s subcommands.
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#--------------------------#
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local Options
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Options=( "-f" "-A" "-I" "-h" "-n" "-v" )
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# ^ « home-manager »'s options.
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#--------------------------#
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local CurrentWord
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CurrentWord="${COMP_WORDS[$COMP_CWORD]}"
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# ^ the word currently being completed
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local PreviousWord
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if [ "$COMP_CWORD" -ge 1 ]
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then
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PreviousWord="${COMP_WORDS[COMP_CWORD-1]}"
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else
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PreviousWord=""
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fi
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# ^ the word to the left of the current word.
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#
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# e.g. in « home-manager -v -f ./<TAB> »:
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#
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# PreviousWord="-f"
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# CurrentWord="./"
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#--------------------------#
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COMPREPLY=()
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case "$PreviousWord" in
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"-f")
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COMPREPLY+=( $( compgen -A file -- "$CurrentWord") )
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;;
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"-I")
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COMPREPLY+=( $( compgen -A directory -- "$CurrentWord") )
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;;
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"-A")
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# shellcheck disable=SC2119
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COMPREPLY+=( $( compgen -W "$(_home-manager_list-nix-attributes)" -- "$CurrentWord") )
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;;
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"remove-generations")
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COMPREPLY+=( $( compgen -W "$(_home-manager_list-generation-identifiers)" -- "$CurrentWord" ) )
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;;
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*)
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COMPREPLY+=( $( compgen -W "${Subcommands[*]}" -- "$CurrentWord" ) )
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COMPREPLY+=( $( compgen -W "${Options[*]}" -- "$CurrentWord" ) )
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;;
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esac
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#--------------------------#
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}
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##################################################
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complete -F _home-manager_completions -o default home-manager
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#complete -W "help edit build switch generations remove-generations expire-generations packages news" home-manager
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@ -34,4 +34,7 @@ runCommand
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--subst-var-by gnused "${gnused}" \
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--subst-var-by less "${less}" \
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--subst-var-by HOME_MANAGER_PATH '${pathStr}'
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install -D -m755 ${./completion.bash} \
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$out/share/bash-completion/completions/home-manager
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''
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