now we can read files and interpret them

nb.h

@@ -1,7 +1,12 @@
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdbool.h>
 #include <string.h>
 
+
 typedef struct{
   int capacity;
   int arrsize;
@@ -9,6 +14,56 @@ typedef struct{
 } nb_arr;
 
 
+ typedef struct{
+    FILE *filep;
+    size_t filesize;
+    int chars;
+    char *buf;
+  } nb_file;
+
+void nb_init(nb_arr *newarr, int initial_capacity);
+
+void nb_append(nb_arr *newarr, char *newval);
+void nb_append_int(nb_arr *newarr, int myint);
+void nb_append_float(nb_arr *newarr, float myfloat);
+
+void nb_free(nb_arr *newarr);
+
+
+char* nb_strdup(const char* s); // make this void that uses realloc later.
+
+void nb_print(nb_arr *newarr);
+void nb_print_info(nb_arr *newarr);
+
+
+void nb_cmd(nb_arr *newarr);
+
+// void copy_file(char* old_file_name, char* new_file_name);
+
+void nb_copy_file(char* old_file_name, char* new_file_name);
+
+//bool needs_rebuild(); // need to implement rename file first to .old or something like nob does
+
+
+bool nb_did_file_change(char *filename);
+
+
+bool nb_does_file_exist(char *filename);
+
+
+void nb_rebuild(char filename[]);
+
+char* nb_read_file(char* file_name);
+
+
+#ifdef NB_IMPLEMENTATION // make sure to define this before using the header
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
  
 /*
   char* nb_strdup(const char* s) {
@@ -109,3 +164,107 @@ void append_c_file(FILE *filepointer){
 
 }
 
+void nb_copy_file(char* old_file_name, char* new_file_name){ // old name shouldnt be nobuild.c. it should be the name of the current file.
+  nb_file old_file; 
+  nb_file new_file;
+
+  old_file.filep = fopen(old_file_name, "rb");
+  fseek(old_file.filep, 0, SEEK_END);
+  
+  old_file.filesize = ftell(old_file.filep);
+  old_file.buf = (char*)malloc(old_file.filesize);
+  fseek(old_file.filep, 0, SEEK_SET);
+  fread(old_file.buf, 1, old_file.filesize, old_file.filep);
+  fclose(old_file.filep);
+
+  new_file.filep = fopen(new_file_name, "wb");
+  fwrite(old_file.buf, 1, old_file.filesize, new_file.filep);
+  fclose(new_file.filep);
+}
+
+bool nb_did_file_change(char *filename){
+  struct stat file_old;
+  stat(filename, &file_old);
+  
+  struct stat file_new;
+  char buf[64];
+  sprintf(buf, "%s.new", filename);
+  stat(buf, &file_new);
+
+  if (file_old.st_mtim.tv_sec > file_new.st_mtim.tv_sec){
+    return true;
+  } else {
+    return false;
+  }
+}
+
+
+bool nb_does_file_exist(char *filename){
+  char buf[64];
+  sprintf(buf, "%s.new", filename);
+
+    if (access("test.c.new", F_OK) == 0){
+    return true;
+  }
+  return false;
+}
+
+void nb_rebuild(char filename[]){
+  
+  char new_file[128];
+  sprintf(new_file, "%s.new", filename); 
+
+  if (nb_does_file_exist(new_file)){
+    printf("%s does exist\n", new_file);
+    if (nb_did_file_change(filename)){
+      printf("file did change\n");
+      nb_copy_file(filename, new_file);
+
+      nb_arr cmd;
+      char fname[128];
+
+      nb_init(&cmd, sizeof(fname)*2); 
+      strncpy(fname, filename, sizeof(fname));
+      fname[sizeof(fname)-1] = '\0';
+      char *dot = strrchr(fname, '.');
+      if (dot != NULL) {
+        *dot = '\0';
+      }     
+      printf("fname is: %s\n", fname);  
+      
+      nb_append(&cmd, "gcc");
+      nb_append(&cmd, "-o");
+      nb_append(&cmd, fname);
+      nb_append(&cmd, filename);
+      nb_cmd(&cmd);
+
+      nb_print_info(&cmd);
+      printf("rebuilt\n");
+
+  } else {
+    printf("file did not change\n");
+    }
+  }else{
+    printf("created %s", filename);
+    nb_copy_file(filename, new_file);
+  }
+}
+
+char* nb_read_file(char* file_name){ // old name shouldnt be nobuild.c. it should be the name of the current file.
+  nb_file file; 
+
+  file.filep = fopen(file_name, "rb");
+  fseek(file.filep, 0, SEEK_END);
+  
+  file.filesize = ftell(file.filep);
+  file.buf = (char*)malloc(file.filesize);
+  fseek(file.filep, 0, SEEK_SET);
+  fread(file.buf, 1, file.filesize, file.filep);
+  fclose(file.filep);
+  return file.buf;
+}
+
+
+#endif //NB_IMPLEMENTATION
+
+