From 82b06103ae3e33eaa8d0806c839131d68d58ddd9 Mon Sep 17 00:00:00 2001
From: axion <i@axionl.me>
Date: Fri, 16 Jul 2021 18:50:09 +0800
Subject: [PATCH] home-manager: add fish completion

---
 home-manager/completion.fish | 62 ++++++++++++++++++++++++++++++++++++
 home-manager/default.nix     |  2 ++
 2 files changed, 64 insertions(+)
 create mode 100644 home-manager/completion.fish

diff --git a/home-manager/completion.fish b/home-manager/completion.fish
new file mode 100644
index 000000000..011a2b3ef
--- /dev/null
+++ b/home-manager/completion.fish
@@ -0,0 +1,62 @@
+#!/bin/env fish
+##################################################
+
+# « home-manager » command-line fish completion
+#
+# © 2021 "Ariel AxionL" <i at axionl dot me>
+#
+# MIT License
+#
+
+##################################################
+
+### Functions
+function __home_manager_generations --description "Get all generations"
+    for i in (home-manager generations)
+        set -l split (string split " " $i)
+        set -l gen_id $split[5]
+        set -l gen_datetime $split[1..2]
+        set -l gen_hash (string match -r '\w{32}' $i)
+        echo $gen_id\t$gen_datetime $gen_hash
+    end
+end
+
+
+### SubCommands
+complete -c home-manager -n "__fish_use_subcommand" -f -a "help" -d "Print home-manager help"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "edit" -d "Open the home configuration in $EDITOR"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "option" -d "Inspect configuration option"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "build" -d "Build configuration into result directory"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "instantiate" -d "Instantiate the configuration and print the resulting derivation"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "switch" -d "Build and activate configuration"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "generations" -d "List all home environment generations"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "packages" -d "List all packages installed in home-manager-path"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "news" -d "Show news entries in a pager"
+complete -c home-manager -n "__fish_use_subcommand" -f -a "uninstall" -d "Remove Home Manager"
+
+complete -c home-manager -n "__fish_use_subcommand" -x -a "remove-generations" -d "Remove indicated generations"
+complete -c home-manager -n "__fish_seen_subcommand_from remove-generations" -f -ka '(__home_manager_generations)'
+
+complete -c home-manager -n "__fish_use_subcommand" -x -a "expire-generations" -d "Remove generations older than TIMESTAMP"
+
+### Options
+complete -c home-manager -F -s f -l "file" -d "The home configuration file"
+complete -c home-manager -x -s A -d "Select an expression in the configuration file"
+complete -c home-manager -F -s I -d "Add a path to the Nix expression search path"
+complete -c home-manager -F -l "flake" -d "Use home-manager configuration at specified flake-uri"
+complete -c home-manager -F -s b -d "Move existing files to new path rather than fail"
+complete -c home-manager -f -s v -l "verbose" -d "Verbose output"
+complete -c home-manager -f -s n -l "dry-run" -d "Do a dry run, only prints what actions would be taken"
+complete -c home-manager -f -s h -l "help" -d "Print this help"
+
+complete -c home-manager -x -l "arg" -d "Override inputs passed to home-manager.nix"
+complete -c home-manager -x -l "argstr" -d "Like --arg but the value is a string"
+complete -c home-manager -x -l "cores" -d "Threads per job (e.g. -j argument to make)"
+complete -c home-manager -x -l "debug"
+complete -c home-manager -f -l "keep-failed" -d "Keep temporary directory used by failed builds"
+complete -c home-manager -f -l "keep-going" -d "Keep going in case of failed builds"
+complete -c home-manager -x -s j -l "max-jobs" -d "Max number of build jobs in parallel"
+complete -c home-manager -x -l "option" -d "Set Nix configuration option"
+complete -c home-manager -f -l "show-trace" -d "Print stack trace of evaluation errors"
+complete -c home-manager -f -l "substitute"
+complete -c home-manager -f -l "no-substitute"
diff --git a/home-manager/default.nix b/home-manager/default.nix
index 5ab755cfe..e86c0ca51 100644
--- a/home-manager/default.nix
+++ b/home-manager/default.nix
@@ -39,4 +39,6 @@ in runCommand "home-manager" {
     $out/share/bash-completion/completions/home-manager
   install -D -m755 ${./completion.zsh} \
     $out/share/zsh/site-functions/_home-manager
+  install -D -m755 ${./completion.fish} \
+    $out/share/fish/completions/home-manager.fish
 ''