Script files support

- readline accepts stream to read from
- fixed issues with EOF
- arsh can be called with a file path as a second parameter, that will
be interpreted

main.c

@@ -21,22 +21,28 @@ void sigint_handler(int signo)
 }
 static constexpr size_t max_line = 1024;
 static char string_buffer[max_line];
-char* readline(char* print)
+char* readline(char* print, FILE* stream)
 {
   if(print)
   {
     printf("%s", print);
   }
-  if((fgets(string_buffer, max_line, stdin) == NULL) && ferror(stdin))
+  if(fgets(string_buffer, max_line, stream) == NULL)
   {
-    perror("fgets error");
+    if (feof(stdin))
+    {
+        return NULL;   // Ctrl+D
+    }
+    if(ferror(stream))
+    {
+      perror("fgets error");
+      clearerr(stdin);
+      return NULL;
+    }
+    return NULL;
   }
   
   size_t length = strlen(string_buffer);
-  if(length == 0)
-  {
-    return NULL;
-  }
   //Remove trailing \n
   if (length > 0 && string_buffer[length - 1] == '\n')
   {
@@ -73,8 +79,20 @@ int cd(char* path)
   return chdir(path);
 }
 
-int main()
+int main(int argc, const char* argv[])
 {
+  FILE* stream = stdin;
+  char* prompt = "arsh> ";
+  if(argc == 2)
+  {
+    FILE* file = fopen(argv[1], "r");
+    if(file)
+    {
+      stream = file;
+      prompt = NULL;
+    }
+  }
+
   struct sigaction s;
   s.sa_handler = sigint_handler;
   sigemptyset(&s.sa_mask);
@@ -92,17 +110,26 @@ int main()
   
   while(true)
   {
-    char* input = readline("arsh> ");
+    char* input = readline(prompt, stream);
     if(input == NULL) //CTRL + D
     {
-      printf("\nexit\n");
+      if(prompt)
+      {
+	printf("\nexit\n");
+      }
       exit(0);
     }
+    
+    // After that line you need cleanup
     char** command = split_input(input);
     if(command[0] == NULL)
     {
       goto cleanup;
     }
+    if(strlen(command[0]) >= 1 && command[0][0] == '#')
+    {
+      goto cleanup;
+    }
     
     if(strcmp(command[0], "cd") == 0)
     {