Generate a manpage

help2man should be enough so far.

.gitignore

@@ -1,5 +1,6 @@
 # Build files
 /ponymap
+/ponymap.1
 /plugins/*.so
 
 # Qt Creator files

Makefile

@@ -9,7 +9,7 @@ LDFLAGS = `pkg-config --libs libssl jansson` -lpthread -lrt -ldl -lcurses
 .PHONY: all clean
 .SUFFIXES:
 
-targets = ponymap plugins/http.so plugins/irc.so plugins/ssh.so
+targets = ponymap ponymap.1 plugins/http.so plugins/irc.so plugins/ssh.so
 
 all: $(targets)
 
@@ -19,5 +19,8 @@ clean:
 ponymap: ponymap.c utils.c plugin-api.h siphash.c
 	$(CC) ponymap.c siphash.c -o $@ $(CFLAGS) $(LDFLAGS)
 
+ponymap.1: ponymap
+	help2man -No $@ ./$<
+
 plugins/%.so: plugins/%.c utils.c plugin-api.h
 	$(CC) $< -o $@ $(CFLAGS) $(LDFLAGS) -shared -fPIC

README

@@ -12,7 +12,7 @@ to write your own service detection plugins.
 
 Building and Running
 --------------------
-Build dependencies: openssl, clang, pkg-config, GNU make, Jansson
+Build dependencies: openssl, clang, pkg-config, GNU make, help2man, Jansson
 
 If you don't have Clang, you can edit the Makefile to use GCC or TCC, they work
 just as good.  But there's no CMake support yet, so I force it in the Makefile.

ponymap.c

@@ -1826,7 +1826,7 @@ parse_program_arguments (struct app_context *ctx, int argc, char **argv)
 		g_debug_mode = true;
 		break;
 	case 'h':
-		opt_handler_usage (&oh);
+		opt_handler_usage (&oh, stdout);
 		exit (EXIT_SUCCESS);
 	case 'V':
 		printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
@@ -1864,7 +1864,7 @@ parse_program_arguments (struct app_context *ctx, int argc, char **argv)
 		exit (EXIT_SUCCESS);
 	default:
 		print_error ("wrong options");
-		opt_handler_usage (&oh);
+		opt_handler_usage (&oh, stderr);
 		exit (EXIT_FAILURE);
 	}
 
@@ -1873,7 +1873,7 @@ parse_program_arguments (struct app_context *ctx, int argc, char **argv)
 
 	if (!argc)
 	{
-		opt_handler_usage (&oh);
+		opt_handler_usage (&oh, stderr);
 		exit (EXIT_FAILURE);
 	}
 

utils.c

@@ -1962,7 +1962,7 @@ opt_handler_init (struct opt_handler *self, int argc, char **argv,
 }
 
 static void
-opt_handler_usage (struct opt_handler *self)
+opt_handler_usage (struct opt_handler *self, FILE *stream)
 {
 	struct str usage;
 	str_init (&usage);
@@ -2000,7 +2000,7 @@ opt_handler_usage (struct opt_handler *self)
 		str_free (&row);
 	}
 
-	fputs (usage.str, stderr);
+	fputs (usage.str, stream);
 	str_free (&usage);
 }