From cbf64a2e14b5696f8c6727a9a3e4dffeb9835586 Mon Sep 17 00:00:00 2001
From: Denis Lehmann <denis@opaque.tech>
Date: Wed, 17 Jul 2024 22:38:14 +0200
Subject: [PATCH] add bash completion

---
 flake.nix           |  1 +
 gra_completion.bash | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 gra_completion.bash

diff --git a/flake.nix b/flake.nix
index aafd9db..9b6c572 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,6 +17,7 @@
               src = self;
               installPhase = ''
                 install -m 755 -D gra $out/bin/gra
+                install -m 644 -D gra_completion.bash $out/share/bash-completion/completions/gra
               '';
             };
             default = self.packages.${system}.gra;
diff --git a/gra_completion.bash b/gra_completion.bash
new file mode 100644
index 0000000..eddeca2
--- /dev/null
+++ b/gra_completion.bash
@@ -0,0 +1,16 @@
+function _gra_completion {
+
+    _args="-h --help"
+
+    # Add config values to completion
+    if [ "${#COMP_WORDS[@]}" -lt 3 ] && [ -f ~/.config/gra.config ]; then
+        readarray -t lines < ~/.config/gra.config
+        for line in "${lines[@]}"; do
+            [[ "$line" =~ ^(.*)= ]] && _args="$_args ${BASH_REMATCH[1]}"
+        done
+    fi
+
+    COMPREPLY=($(compgen -W "$_args" -- "${COMP_WORDS[COMP_CWORD]}"))
+}
+
+complete -F _gra_completion gra