From cbf5629a2cfde155924d2a173111cc473f30b693 Mon Sep 17 00:00:00 2001
From: Jan Sucan <jan@jansucan.com>
Date: Sat, 18 Jan 2025 14:26:31 +0100
Subject: Add version command line option

---
 README.md                   |  2 ++
 src/main.cpp                | 10 ++++++++++
 src/options.cpp             |  8 ++++++++
 src/options.h               |  1 +
 tests/009-version_option.sh |  9 +++++++++
 5 files changed, 30 insertions(+)
 create mode 100644 tests/009-version_option.sh

diff --git a/README.md b/README.md
index 1b07d13..480b2df 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ utility.
 
 > diff-dd help
 
+> diff-dd version
+
 > diff-dd backup [-B BUFFER_SIZE] -i INFILE -b BASEFILE -o OUTFILE
 
 > diff-dd restore [-B BUFFER_SIZE] -d DIFFFILE -o OUTFILE
diff --git a/src/main.cpp b/src/main.cpp
index 8f6dac5..9b74c08 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -29,14 +29,24 @@
 #include "options.h"
 #include "restore.h"
 
+#include "program_info.h"
+
 #include <iostream>
 
+void
+print_version()
+{
+    std::cout << PROGRAM_NAME_STR << " " << PROGRAM_VERSION_STR << std::endl;
+}
+
 int
 main(int argc, char **argv)
 {
     try {
         if (OptionParser::isHelp(argc, argv)) {
             OptionParser::printUsage();
+        } else if (OptionParser::isVersion(argc, argv)) {
+            print_version();
         } else if (OptionParser::isBackup(argc, argv)) {
             backup(OptionParser::parseBackup(argc, argv));
         } else if (OptionParser::isRestore(argc, argv)) {
diff --git a/src/options.cpp b/src/options.cpp
index c44fd06..a5912b6 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -83,6 +83,8 @@ OptionParser::printUsage()
     std::cout << "   Or: " << PROGRAM_NAME_STR << " restore";
     std::cout << "[-B BUFFER_SIZE] -d DIFFFILE -o OUTFILE" << std::endl;
 
+    std::cout << "   Or: " << PROGRAM_NAME_STR << " version" << std::endl;
+
     std::cout << "   Or: " << PROGRAM_NAME_STR << " help" << std::endl;
 }
 
@@ -92,6 +94,12 @@ OptionParser::isHelp(int argc, char **argv)
     return isOperation(argc, argv, "help");
 }
 
+bool
+OptionParser::isVersion(int argc, char **argv)
+{
+    return isOperation(argc, argv, "version");
+}
+
 bool
 OptionParser::isBackup(int argc, char **argv)
 {
diff --git a/src/options.h b/src/options.h
index 80cb8f8..ba7e7ac 100644
--- a/src/options.h
+++ b/src/options.h
@@ -90,6 +90,7 @@ class OptionParser
   public:
     static void printUsage();
     static bool isHelp(int argc, char **argv);
+    static bool isVersion(int argc, char **argv);
     static bool isBackup(int argc, char **argv);
     static bool isRestore(int argc, char **argv);
     ;
diff --git a/tests/009-version_option.sh b/tests/009-version_option.sh
new file mode 100644
index 0000000..2dc32f5
--- /dev/null
+++ b/tests/009-version_option.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+source ./assert.sh
+
+PROGRAM_EXEC="$1"
+
+assert "diff-dd 3.0.0-prealpha" "" 0 $PROGRAM_EXEC version
+
+exit 0
-- 
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