From 4a278d3e39a685379711727eac7bfaa83679e0e4 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 28 Aug 2024 15:29:46 -0400
Subject: build: Allow ./configure --version=X.Y.Z

---
 build/config.mk |  1 +
 configure       | 12 +++++++-----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/build/config.mk b/build/config.mk
index 80206c7..86a4861 100644
--- a/build/config.mk
+++ b/build/config.mk
@@ -38,6 +38,7 @@ gen/vars.mk::
 	@printf 'MKDIR := %s\n' "$$XMKDIR" >>$@
 	@printf 'PKG_CONFIG := %s\n' "$$XPKG_CONFIG" >>$@
 	@printf 'RM := %s\n' "$$XRM" >>$@
+	@test -z "$$VERSION" || printf 'export VERSION=%s\n' "$$VERSION" >>$@
 	${VCAT} $@
 
 # Sets the build flags.  This depends on vars.mk and uses a recursive make so
diff --git a/configure b/configure
index ef6f58c..5156c91 100755
--- a/configure
+++ b/configure
@@ -7,6 +7,9 @@
 
 set -eu
 
+# Get the relative path to the source tree based on how the script was run
+DIR=$(dirname -- "$0")
+
 # Print the help message
 help() {
     cat <<EOF
@@ -57,6 +60,8 @@ Packaging:
       Set the installation prefix (default: /usr)
   --mandir=/path
       Set the man page directory (default: \$PREFIX/share/man)
+  --version=X.Y.Z
+      Set the version string (default: $("$DIR/build/version.sh"))
 
 This script is a thin wrapper around a makefile-based configuration system.
 Any other arguments will be passed directly to the $MAKE invocation, e.g.
@@ -134,7 +139,7 @@ for arg; do
                     printf 'warning: Treating "%s" like "%s"\n' "$old" "$arg" >&2
                     ;;
             esac
-        ;;
+            ;;
     esac
 
     case "$arg" in
@@ -165,7 +170,7 @@ for arg; do
             esac
             ;;
 
-        --prefix=*|--mandir=*)
+        --prefix=*|--mandir=*|--version=*)
             set -- "$@" "$NAME=$value"
             ;;
 
@@ -188,9 +193,6 @@ for arg; do
     esac
 done
 
-# Get the relative path to the source tree based on how the script was run
-DIR=$(dirname -- "$0")
-
 # Set up symbolic links for out-of-tree builds
 for f in Makefile build completions docs src tests; do
     test -e "$f" || ln -s "$DIR/$f" "$f"
-- 
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