made work: copy a file, move a file, check if a file exists, delete a file

src/file.c

@@ -10,7 +10,7 @@ fileCountLines(file_t* f) {
 	int lines = 0;
 	FILE* fd = fopen(f->path, "r");
 	if (!fd) {
-		fprintf(stderr, "unable to open file");
+		fprintf(stderr, "unable to count lines in file %s\n", f->path);
 		exit(EXIT_FAILURE);
 	}
 
@@ -70,6 +70,22 @@ fileToString(file_t* f) {
     return (char *)vectorToString(f->lines);
 }
 
+int
+fileExists(file_t* f) {
+    FILE* fd = fopen(f->path, "r");
+    if (!fd) {
+        return 0; // file does not exist
+    } else {
+        return 1; // file exists
+    }
+    fclose(fd);
+}
+
+void
+fileCreateEmpty(char* path) {
+    fclose(fopen(path, "w"));
+}
+
 file_t* 
 fileInit(char* path) {
 	file_t* f = malloc(sizeof(file_t));
@@ -80,6 +96,12 @@ fileInit(char* path) {
 
 	f->path = path;
 
+    if (fileExists(f) == 0) {
+        // if file 'f' does not exist
+        fileCreateEmpty(f->path);
+        return fileInit(f->path);
+    }
+
 	f->length = fileCountLines(f);
 
 	f->lines = vectorInit(VECTOR); // vector of vectors of chars = vector of strings
@@ -161,3 +183,42 @@ fileWrite(file_t* f, char* payload) {
     f->length++;
 	f->not_newline_terminated = 1;
 }
+
+void
+fileCopy(file_t* src, char* dst) {
+	FILE* fd = fopen(dst, "w");
+    if (!fd) {
+        fprintf(stderr, "could not open file for writing\n");
+        exit(EXIT_FAILURE);
+    }
+
+	char ch;
+	for (int i = 0; i < src->length; i++) {
+		for (int j = 0; j < ((vector_t *)vectorGetAt(src->lines, i))->size; j++) {
+			ch = *((char *)vectorGetAt((vector_t *)vectorGetAt(src->lines, i), j));
+			fprintf(fd, "%c", ch);
+		}
+		fprintf(fd, "\n");
+	}
+
+	fclose(fd);
+}
+
+void
+fileDelete(file_t* f) {
+    int retval = remove(f->path); // try to remove/delete a file
+
+    if (retval != 0) { // if it could not do so, raise an error
+        fprintf(stderr, "could not delete file\n");
+        // fileCleanup(f); // don't know if this is necessary... :shrug:
+        // exit(EXIT_FAILURE);
+    }
+    fileCleanup(f);
+}
+
+void
+fileMove(file_t* src, char* dst) {
+	fileCopy(src, dst);
+
+    fileDelete(src);
+}