Use shared macro for print_version

commons.mk

@@ -4,7 +4,7 @@ CFLAGS := @$/compile_flags.txt
 
 CFLAGS += -ffunction-sections -fdata-sections
 CFLAGS += -Wp,-U_FORTIFY_SOURCE
-CFLAGS += -iquote src
+CFLAGS += -iquote $/src
 
 LDFLAGS := -fwhole-program -flto
 LDFLAGS += -Wl,--gc-sections

src/echo/echo.c

@@ -7,10 +7,7 @@
 #define VERSION "1.0.0"
 #define AUTHOR "Hoorad Farrokh (proh14)"
 
-#define print_version()                                                        \
-  do {                                                                         \
-    printf("%s\nversion: %s\nby: %s\n", NAME, VERSION, AUTHOR);                \
-  } while (0)
+#include "version_info.h"
 
 int isoctal(int c) { return (c >= '0' && c <= '7'); }
 

src/ls/ls_main.c

@@ -8,10 +8,7 @@
 #define VERSION "1.0.0"
 #define AUTHOR "Yohann Boniface (Sigmanificient)"
 
-#define print_version()                                                        \
-  do {                                                                         \
-    printf("%s\nversion: %s\nby: %s\n", NAME, VERSION, AUTHOR);                \
-  } while (0)
+#include "version_info.h"
 
 static const char FLAGLIST[] = "alRdrt";
 static char DEFAULT_LOCATION[] = ".";
@@ -62,8 +59,10 @@ int main(int argc, char **argv) {
   int err = 0;
 
   for (int i = 0; argv[i] != NULL; i++)
-    if (!strcmp(argv[i], "--version"))
-      return printf(VERSION), EXIT_SUCCESS;
+    if (!strcmp(argv[i], "--version")) {
+      print_version();
+      return EXIT_SUCCESS;
+    }
   flags = compose_flaglist(argc, argv);
   db.entries = malloc(db.size * sizeof(*db.entries));
   if (db.entries == NULL)

src/rmdir/rmdir.c

@@ -10,10 +10,7 @@
 #define VERSION "1.0.0"
 #define AUTHOR "tim-tm"
 
-#define print_version()                                                        \
-  do {                                                                         \
-    printf("%s\nversion: %s\nby: %s\n", NAME, VERSION, AUTHOR);                \
-  } while (0)
+#include "version_info.h"
 
 bool ignore_fail = false;
 bool parents = false;

src/version_info.h

@@ -0,0 +1,13 @@
+#ifndef VERSION_INFO_H
+#define VERSION_INFO_H
+
+#if !defined(NAME) || !defined(VERSION) || !defined(AUTHOR)
+#error "missing NAME, VERSION or AUTHOR definition"
+#endif
+
+#define print_version()                                                        \
+  do {                                                                         \
+    printf("%s\nversion: %s\nby: %s\n", NAME, VERSION, AUTHOR);                \
+  } while (0)
+
+#endif