From 01f52b42e8f8c358c2ccbc3d59987b7043444d4d Mon Sep 17 00:00:00 2001
From: Alexei Mikhailov <alexei.mikhailov@socialfirstgames.com>
Date: Sun, 29 Dec 2024 15:54:54 +0200
Subject: [PATCH] exercism: install shell completions

Exercism ships both with pre-generated completions [0], and has
`completion` command to generate completions for
bash/zsh/fish/powershell.
Initially I was planning to use the latter, but seems like due to
a bug (?) in cobra-generated completions (probably [1]), the resulting
completions aren't fully working (if at all);
so this makes use of the ones provided in the repo. I'll probably update
this once more to use auto-generated completions once I manage to update
cobra dependency for exercism CLI itself.

[0] https://github.com/exercism/cli/tree/main/shell
[1] https://github.com/spf13/cobra/pull/1940
---
 pkgs/by-name/ex/exercism/package.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pkgs/by-name/ex/exercism/package.nix b/pkgs/by-name/ex/exercism/package.nix
index 2dc94860e8ea..117798021077 100644
--- a/pkgs/by-name/ex/exercism/package.nix
+++ b/pkgs/by-name/ex/exercism/package.nix
@@ -1,6 +1,7 @@
 {
   lib,
   buildGoModule,
+  installShellFiles,
   fetchFromGitHub,
   nix-update-script,
 }:
@@ -22,8 +23,17 @@ buildGoModule rec {
 
   subPackages = [ "./exercism" ];
 
+  nativeBuildInputs = [ installShellFiles ];
+
   passthru.updateScript = nix-update-script { };
 
+  postInstall = ''
+    installShellCompletion --cmd exercism \
+      --bash shell/exercism_completion.bash \
+      --fish shell/exercism.fish \
+      --zsh shell/exercism_completion.zsh
+  '';
+
   meta = with lib; {
     inherit (src.meta) homepage;
     description = "Go based command line tool for exercism.io";