Lots of changes

implements keybinds
restructures code, fixes up makefile
etc

src/Makefile

@@ -1,16 +1,19 @@
 TARGET=editor
 CC=gcc
 
-OBJ = main.o draw.o term.o 
+OBJ = main.o term.o draw.o controls.o
 
 $(TARGET): $(OBJ)
 	mkdir -p ../build
 	$(CC) -o $(TARGET) $(OBJ) -g
 	mv $(TARGET) ../build/
 
-main.o: term.h draw.h
-term.o: term.h draw.h
-draw.o: term.h draw.h
+main.o: headers/term.h headers/draw.h headers/controls.h
+term.o: headers/term.h 
+draw.o: headers/term.h headers/draw.h
+controls.o: headers/controls.h headers/__defines.h headers/draw.h headers/term.h
+
+
 
 .PHONY: clean
 clean:

src/controls.c

@@ -0,0 +1,96 @@
+#include <stdio.h>
+
+#include "headers/__defines.h"
+#include "headers/controls.h"
+#include "headers/draw.h"
+#include "headers/term.h"
+
+extern editor_t editor;
+extern screen_buffer_t screen_buffer;
+
+int parse_input_char(char input_char)
+{
+	if (INSERT_MODE == editor.control_type) {
+		if (ESC == input_char) {
+			editor.control_type = COMMAND_MODE;
+			return 0;
+		}
+
+		// put char
+		
+		return 0;
+	}
+
+	switch(input_char) {
+		/** INSERT MODE KEYS START **/
+		case 'a':
+			move_cursor(RIGHT);
+		case 'i':
+			editor.control_type = INSERT_MODE;
+			break;
+		/** INSERT MODE KEYS END **/
+
+		/** MOVEMENT KEYS START **/
+
+		case 'h':
+			move_cursor(LEFT);
+			break;
+		case 'j':
+			move_cursor(DOWN);
+			break;
+		case 'k':
+			move_cursor(UP);
+			break;
+		case 'l':
+			move_cursor(RIGHT);
+			break;
+
+		case 'g': // TODO: move this to 'gg'
+			move_cursor(HOME);
+			break;
+		case 'G':
+			// want to move to the end of the buffer
+			break;
+
+		case '0':
+			move_cursor(BEGIN_LINE);
+			break;
+
+
+		/** MOVEMENT KEYS END **/
+		default:
+			return -1;
+	}
+	return 0;
+}
+
+void move_cursor(movement_t dir)
+{
+	switch(dir) {
+		case LEFT:
+			move_cursor_pos(--editor.cx, editor.cy);	
+			break;
+		case RIGHT:
+			move_cursor_pos(++editor.cx, editor.cy);
+			break;
+		case UP:
+			move_cursor_pos(editor.cx, --editor.cy);
+			break;
+		case DOWN:
+			move_cursor_pos(editor.cx, ++editor.cy);
+			break;
+		case HOME:
+			move_cursor_pos(1, 1);
+			editor.cx = 1;
+			editor.cy = 1;
+			break;
+		case BEGIN_LINE:
+			move_cursor_pos(1, editor.cy);
+			editor.cx = 1;
+			break;
+		default:
+			fprintf(stderr, "move_cursor had an invalid input, what the hell.\n");
+			exit(EXIT_FAILURE);
+	}
+}
+

src/draw.c

@@ -2,8 +2,8 @@
 #include <string.h>
 #include <unistd.h>
 
-#include "draw.h"
-#include "term.h"
+#include "headers/draw.h"
+#include "headers/term.h"
 
 #define MAX_LEN 256
 
@@ -17,13 +17,11 @@ extern screen_buffer_t screen_buffer;
 void refresh_screen(void)
 {
 	/**
-	 * TODO: need to move the cursor back at the end
-	 * also need to draw the cusor coords at the bottom
+	 * TODO: 
 	 * and need to implement controls
 	 */
 	
 	int cur_x, cur_y;
-	char* move_cursor;
 
 	cur_x = editor.cx;
 	cur_y = editor.cy;
@@ -36,10 +34,9 @@ void refresh_screen(void)
 	screen_buffer_append(&screen_buffer, CLEAR_SCREEN_STR, CLEAR_SCREEN_STR_LEN);
 
 	draw_editor_rows();
+	draw_cursor_pos();
 
-	move_cursor_pos(&move_cursor, cur_x, cur_y);
-	screen_buffer_append(&screen_buffer, move_cursor, strlen(move_cursor));
-	free(move_cursor);
+	move_cursor_pos(cur_x, cur_y);
 
 	screen_buffer_append(&screen_buffer, SHOW_CURSOR_STR, SHOW_CURSOR_STR_LEN);
 
@@ -53,11 +50,21 @@ void draw_editor_rows(void)
 		screen_buffer_append(&screen_buffer, "~\r\n", 3);
 }
 
-
-void move_cursor_pos(char** out, int x, int y)
+void draw_cursor_pos(void)
 {
-	*out = malloc(sizeof(char) * MAX_LEN);
-	snprintf(*out, MAX_LEN, "\e[%d;%dH", x, y);
+	char* pos = malloc(sizeof(char) * MAX_LEN);
+	snprintf(pos, MAX_LEN, "%d,%d", editor.cx, editor.cy);
+	screen_buffer_append(&screen_buffer, pos, strlen(pos));
+	free(pos);
+}
+
+void move_cursor_pos(int x, int y)
+{
+	// TODO: add check for boundaries
+	char* out = malloc(sizeof(char) * MAX_LEN);
+	snprintf(out, MAX_LEN, "\e[%d;%dH", y, x);
+	screen_buffer_append(&screen_buffer, out, strlen(out));
+	free(out);
 }
 
 #undef MAX_LEN

src/headers/__defines.h

@@ -0,0 +1,8 @@
+#ifndef __DEFINES_H
+#define __DEFINES_H
+
+typedef enum {
+	ESC = 0x1B,
+} key_code_t;
+
+#endif

src/headers/controls.h

@@ -0,0 +1,15 @@
+#ifndef CONTROLS_H
+#define CONTROLS_H
+
+typedef enum {
+	UP, DOWN,
+	LEFT, RIGHT,
+	HOME,
+	BEGIN_LINE,
+} movement_t;
+
+int parse_input_char(char in);
+
+void move_cursor(movement_t dir);
+
+#endif

src/headers/draw.h

@@ -19,17 +19,14 @@
 void refresh_screen(void);
 
 void draw_editor_rows(void);
+void draw_cursor_pos(void);
 
 /**
  * # move_cursor_pos
  *
- * - char** out - pointer to char* which will be malloc'd and have the formatted string placed into
  * - int x - x pos
  * - int y - y pos
- *
- * out must be free'd
  */
-void move_cursor_pos(char** out, int x, int y);
-
+void move_cursor_pos(int x, int y);
 
 #endif

src/headers/term.h

@@ -4,8 +4,14 @@
 #ifndef TERM_H
 #define TERM_H
 
+typedef enum {
+	COMMAND_MODE,
+	INSERT_MODE,
+} control_type_t;
+
 typedef struct {
 	struct termios term_settings;
+	control_type_t control_type;
 	size_t cols, rows;
 	int cx, cy; // cursor pos
 } editor_t;

src/main.c

@@ -1,8 +1,8 @@
-#include <stdio.h>
 #include <unistd.h>
 
-#include "draw.h"
-#include "term.h"
+#include "headers/controls.h"
+#include "headers/draw.h"
+#include "headers/term.h"
 
 editor_t editor;
 screen_buffer_t screen_buffer;
@@ -20,6 +20,8 @@ int main(void)
 		read(STDIN_FILENO, &c, 1);
 		if (c == '\004')
 			break;
+		else
+			parse_input_char(c);
 		refresh_screen();
 	}
 

src/term.c

@@ -6,7 +6,7 @@
 #include <unistd.h>
 
 
-#include "term.h"
+#include "headers/term.h"
 
 /** BEGIN extern section **/
 
@@ -107,8 +107,10 @@ void setup_terminal(void)
 		exit(EXIT_FAILURE);
 	}
 
-	editor.cx = 0;
-	editor.cy = 0;
+	editor.control_type = COMMAND_MODE;
+
+	editor.cx = 1;
+	editor.cy = 1;
 
 	editor.cols = win.ws_col;
 	editor.rows = win.ws_row;