added indent and unindent commmands

c_indent.c

@@ -0,0 +1,23 @@
+void
+c_indent(char *c) {
+	Row *row = b_getline(buffer, atoi(c + 2));
+	if (row == NULL) { puts ("invalid line"); return; }
+
+
+	for(int i = ROW_SIZE - 1; i >= 1; i--) {
+		row->text[i] = row->text[i - 1];
+	}
+	row->text[0] = '\t';
+}
+
+void
+c_unindent(char *c) {
+	Row *row = b_getline(buffer, atoi(c + 2));
+	if (row == NULL) { puts ("invalid line"); return; }
+
+	for(int i = 0; i < ROW_SIZE - 1; i++) {
+		row->text[i] = row->text[i + 1];
+	}
+	row->text[ROW_SIZE] = 0;
+}
+

commands.c

@@ -11,3 +11,7 @@ NULL,
 ['p'] = NULL,
 ['p'] = c_print,
 ['P'] = NULL,
+[']'] = c_indent,
+['['] = c_unindent,
+
+

efn.c

@@ -22,3 +22,5 @@
 
 #include "c_save.c"
 #include "c_insertline.c"
+#include "c_indent.c"
+

efn.h

@@ -14,3 +14,7 @@ Row *b_getline(Row *, int);
 void c_writeline(char *);
 void c_save(char*);
 void c_insertline(char *);
+void c_indent(char *);
+void c_unindent(char *);
+
+

main.c

@@ -18,3 +18,4 @@ char *com = fgets(buf, sizeof(buf), stdin);
 
 
 
+