From 4178308e964e174260bf7aebb8ee2aee9ab194be Mon Sep 17 00:00:00 2001
From: Robert Bendun <rob.bendun@gmail.com>
Date: Sat, 14 Jan 2023 22:48:15 +0100
Subject: [PATCH] make version info available

---
 CHANGELOG.md    |  1 +
 config.mk       | 13 ++++++++++++-
 musique/main.cc | 14 ++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 155fbc7..d35e530 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Builtin function documentation generation from C++ Musique implementation source code
 - New builtins: digits
 - Negative numbers!
+- Version command via `:version` in REPL or `--version`, `-v` in command line.
 
 ### Removed
 
diff --git a/config.mk b/config.mk
index dd14879..86cb27a 100644
--- a/config.mk
+++ b/config.mk
@@ -1,7 +1,18 @@
 MAKEFLAGS="-j $(grep -c ^processor /proc/cpuinfo)"
 
+MAJOR := 0
+MINOR := 3
+PATCH := 1
+COMMIT := gc$(shell git rev-parse --short HEAD 2>/dev/null)
+
+ifeq ($(COMMIT),gc)
+	COMMIT = "gcunknown"
+endif
+
+VERSION := $(MAJOR).$(MINOR).$(PATCH)-dev+$(COMMIT)
+
 CXXFLAGS:=$(CXXFLAGS) -std=c++20 -Wall -Wextra -Werror=switch -Werror=return-type -Werror=unused-result
-CPPFLAGS:=$(CPPFLAGS) -Ilib/expected/ -I. -Ilib/bestline/ -Ilib/rtmidi/
+CPPFLAGS:=$(CPPFLAGS) -Ilib/expected/ -I. -Ilib/bestline/ -Ilib/rtmidi/ -DMusique_Version='"$(VERSION)"'
 LDFLAGS=-flto
 LDLIBS= -lpthread
 
diff --git a/musique/main.cc b/musique/main.cc
index 3ae5fc7..7721c56 100644
--- a/musique/main.cc
+++ b/musique/main.cc
@@ -84,6 +84,9 @@ static T pop(std::span<char const*> &span)
 		"    --ast\n"
 		"      prints ast for given code\n"
 		"\n"
+		"    -v,--version\n"
+		"      prints Musique interpreter version\n"
+		"\n"
 		"Thanks to:\n"
 		"  Sy Brand, https://sybrand.ink/, creator of tl::expected https://github.com/TartanLlama/expected\n"
 		"  Justine Tunney, https://justinetunney.com, creator of bestline readline library https://github.com/jart/bestline\n"
@@ -289,6 +292,12 @@ static Result<bool> handle_repl_session_commands(std::string_view input, Runner
 				std::exit(0);
 			}
 		},
+		Command { "version",
+			+[](Runner&, std::optional<std::string_view>) -> std::optional<Error> {
+				std::cout << Musique_Version << std::endl;
+				return {};
+			},
+		},
 		Command { "clear",
 			+[](Runner&, std::optional<std::string_view>) -> std::optional<Error> {
 				std::cout << "\x1b[1;1H\x1b[2J" << std::flush;
@@ -424,6 +433,11 @@ static std::optional<Error> Main(std::span<char const*> args)
 			continue;
 		}
 
+		if (arg == "--version" || arg == "-v") {
+			std::cout << Musique_Version << std::endl;
+			return {};
+		}
+
 		if (arg == "-o" || arg == "--output") {
 			if (args.empty()) {
 				std::cerr << "musique: error: option " << arg << " requires an argument" << std::endl;