lua: support both '-V' and '-v' options for version

Finally fix compatibility with Lua 5.1 command-line options.

Closes #1265

src/main.cc

@@ -529,7 +529,7 @@ print_help(const char *program)
 	puts("All command line options are passed to the interpreted script.");
 	puts("When no script name is provided, the server responds to:");
 	puts("  -h, --help\t\t\tdisplay this help and exit");
-	puts("  -V, --version\t\t\tprint program version and exit");
+	puts("  -v, --version\t\t\tprint program version and exit");
 	puts("  -e EXPR\t\t\texecute string 'EXPR'");
 	puts("  -l NAME\t\t\trequire library 'NAME'");
 	puts("  -i\t\t\t\tenter interactive mode after executing 'SCRIPT'");
@@ -560,15 +560,16 @@ main(int argc, char **argv)
 
 	static struct option longopts[] = {
 		{"help", no_argument, 0, 'h'},
-		{"version", no_argument, 0, 'V'},
+		{"version", no_argument, 0, 'v'},
 		{NULL, 0, 0, 0},
 	};
-	static const char *opts = "+hVie:l:";
+	static const char *opts = "+hVvie:l:";
 
 	int ch;
 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
 		switch (ch) {
 		case 'V':
+		case 'v':
 			print_version();
 			return 0;
 		case 'h':

test/box-py/args.result

@@ -6,7 +6,7 @@ Usage: tarantool script.lua [OPTIONS] [SCRIPT [ARGS]]
 All command line options are passed to the interpreted script.
 When no script name is provided, the server responds to:
   -h, --help			display this help and exit
-  -V, --version			print program version and exit
+  -v, --version			print program version and exit
   -e EXPR			execute string 'EXPR'
   -l NAME			require library 'NAME'
   -i				enter interactive mode after executing 'SCRIPT'
@@ -24,7 +24,7 @@ Usage: tarantool script.lua [OPTIONS] [SCRIPT [ARGS]]
 All command line options are passed to the interpreted script.
 When no script name is provided, the server responds to:
   -h, --help			display this help and exit
-  -V, --version			print program version and exit
+  -v, --version			print program version and exit
   -e EXPR			execute string 'EXPR'
   -l NAME			require library 'NAME'
   -i				enter interactive mode after executing 'SCRIPT'
@@ -51,6 +51,14 @@ Compiler: cc
 C_FLAGS: flags
 CXX_FLAGS: flags
 
+tarantool -v
+Tarantool 1.minor.patch-<rev>-<commit>
+Target: platform <build>
+Build options: flags
+Compiler: cc
+C_FLAGS: flags
+CXX_FLAGS: flags
+
 tarantool -V
 Tarantool 1.minor.patch-<rev>-<commit>
 Target: platform <build>

test/box-py/args.test.py

@@ -21,6 +21,7 @@ sys.stdout.push_filter("CXX_FLAGS:.*", "CXX_FLAGS: flags")
 sys.stdout.push_filter("Compiler: .*", "Compiler: cc")
 
 server.test_option("--version")
+server.test_option("-v")
 server.test_option("-V          ")
 
 script = os.getenv("SOURCEDIR") + "/test/box-py/args.lua"