From 8db5cd6989b53c929b4ab628083ac48ae592ca25 Mon Sep 17 00:00:00 2001
From: Patrick Spek <p.spek@tyil.nl>
Date: Tue, 5 Mar 2024 08:28:40 +0100
Subject: Implement variable references

---
 CHANGELOG.md         |  6 ++++++
 lib/util/config.bash | 14 ++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 407e62d..e2f9903 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [UNRELEASED]
 
+### Added
+
+- Configuration variables can be assigned values of other variables with the
+  `&=` assignment. This allows a single value to be re-used dynamically, rather
+  than having to explicitly set the same value several times.
+
 ### Fixed
 
 - Passing an empty string as default value to `config` should now properly
diff --git a/lib/util/config.bash b/lib/util/config.bash
index 9817cf3..703dc4d 100644
--- a/lib/util/config.bash
+++ b/lib/util/config.bash
@@ -55,6 +55,20 @@ config_for() {
 
 		[[ ! -f $file ]] && continue
 
+		# Check if the lookup is a reference variable, defined by using
+		# &= instead of just a single = as seperator. If this exists,
+		# do a new config_for lookup, this time using the value as the
+		# key for the new lookup.
+		value="$(awk -F= '$1 == "'"$key"'&" { print $0 }' "$file" | cut -d'=' -f 2-)"
+
+		if [[ -n $value ]]
+		then
+			debug "bashtard/config_for" "Found reference for $key to $value in $file"
+
+			printf "%s" "$(config_for "$host" "$value")"
+			return
+		fi
+
 		# Use awk to find the right line, then use cut to get the
 		# actual value. Cutting it out with awk _is_ possible, but
 		# comes with whitespace issues or having to deal with values
-- 
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