fix: handle system() errors

yait/main.c

@@ -104,10 +104,16 @@ create_project (format_t fmt)
       return 1;
     }
   if (fmt.git)
-    system ("git init --quiet");
+    err = system ("git init --quiet");
+  if (err)
+    {
+      printfn ("failed on git initialize: %s", strerror (err));
+      return 1;
+    }
   if (!fmt.name)
     fmt.name = DEFAULT_USER_NAME;
-  create_file_with_content ("README",
+  create_file_with_content (
+      "README",
       "%s ( concise description )\n\n"
       "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do "
       "eiusmod tempor\n"
@@ -121,7 +127,8 @@ create_project (format_t fmt)
       "proident, sunt in\n"
       "culpa qui officia deserunt mollit anim id est laborum.",
       fmt.project ? fmt.project : DEFAULT_PROJECT_NAME);
-  create_file_with_content ("configure",
+  create_file_with_content (
+      "configure",
       "#!/bin/sh\n"
       "\n"
       "usage() {\n"
@@ -192,7 +199,8 @@ create_project (format_t fmt)
       if (*p >= 'a' && *p <= 'z')
         *p = *p - 'a' + 'A';
     }
-  create_file_with_content ("Makefile",
+  create_file_with_content (
+      "Makefile",
       "prefix = /usr/bin\n\n"
       "%s_SRCS := $(wildcard *.c)\n"
       "%s_OBJS := $(patsubst %%.c,c-out/obj/%%.o,$(%s_SRCS))\n\n"
@@ -228,7 +236,8 @@ create_project (format_t fmt)
       mkfile_name, mkfile_name, mkfile_name);
   free (mkfile_name);
   if (fmt.clang_format)
-    create_file_with_content (".clang-format", "Language: Cpp\nBasedOnStyle: GNU\n");
+    create_file_with_content (".clang-format",
+                              "Language: Cpp\nBasedOnStyle: GNU\n");
   switch (fmt.licence)
     {
     case BSD3:
@@ -266,7 +275,8 @@ create_project (format_t fmt)
       break;
     }
   create_and_enter_directory (fmt.project);
-  create_file_with_content ("main.c",
+  create_file_with_content (
+      "main.c",
       "#include <stdio.h>\n\nint main(void) {\n  printf(\"%s: Hello "
       "%s!\\n\");\nreturn 0;\n}",
       fmt.project ? fmt.project : DEFAULT_PROJECT_NAME,