From 15b2358ba963e1d793d63bee6a40f4a759fc7ae9 Mon Sep 17 00:00:00 2001
From: Aritra Sarkar <aritra1911@yahoo.com>
Date: Fri, 19 Nov 2021 12:02:53 +0530
Subject: [PATCH] Move one of the rects with hjkl

---
 ansilib/inc/graphics/box.h    |  2 ++
 ansilib/inc/graphics/shapes.h |  2 +-
 ansilib/src/graphics/box.c    | 35 ++++++++++++++++++++++++++++++++++-
 ansilib/src/graphics/shapes.c | 10 +++++-----
 src/main.c                    | 32 +++++++++++++++++++++-----------
 5 files changed, 63 insertions(+), 18 deletions(-)

diff --git a/ansilib/inc/graphics/box.h b/ansilib/inc/graphics/box.h
index b1f149c..0bb431d 100644
--- a/ansilib/inc/graphics/box.h
+++ b/ansilib/inc/graphics/box.h
@@ -14,5 +14,7 @@ typedef struct {
 } box_t;
 
 void draw(const box_t *box);
+void erase(const box_t *box);
+void nudge(box_t *box, dir_t dir, int32_t steps);
 
 #endif  /* __GRAPHICS_BOX_H_ */
diff --git a/ansilib/inc/graphics/shapes.h b/ansilib/inc/graphics/shapes.h
index 54a5d3a..3a2e2ed 100644
--- a/ansilib/inc/graphics/shapes.h
+++ b/ansilib/inc/graphics/shapes.h
@@ -5,6 +5,6 @@
 
 # include <graphics/common.h>
 
-void draw_rectangle(uint32_t width, uint32_t height);
+void draw_rectangle(uint32_t width, uint32_t height, char ch);
 
 #endif  /* __GRAPHICS_SHAPES_H_ */
diff --git a/ansilib/src/graphics/box.c b/ansilib/src/graphics/box.c
index 21bc952..ab1b20e 100644
--- a/ansilib/src/graphics/box.c
+++ b/ansilib/src/graphics/box.c
@@ -1,3 +1,5 @@
+#include <stdint.h>
+
 #include <ansi/cursor.h>
 #include <graphics/box.h>
 #include <graphics/shapes.h>
@@ -7,7 +9,38 @@ void draw(const box_t *box)
     switch ( box->type ) {
     case RECTANGLE:
         move_cursor(box->origin);
-        draw_rectangle(box->width, box->height);
+        draw_rectangle(box->width, box->height, '#');
+        break;
+    }
+}
+
+void erase(const box_t *box)
+{
+    switch ( box->type ) {
+    case RECTANGLE:
+        move_cursor(box->origin);
+        draw_rectangle(box->width, box->height, ' ');
+        break;
+    }
+}
+
+void nudge(box_t *box, dir_t dir, int32_t steps)
+{
+    switch ( dir ) {
+    case UP:
+        box->origin.y -= steps;
+        break;
+
+    case DOWN:
+        box->origin.y += steps;
+        break;
+
+    case LEFT:
+        box->origin.x -= steps;
+        break;
+
+    case RIGHT:
+        box->origin.x += steps;
         break;
     }
 }
diff --git a/ansilib/src/graphics/shapes.c b/ansilib/src/graphics/shapes.c
index 12fae5f..3eef5df 100644
--- a/ansilib/src/graphics/shapes.c
+++ b/ansilib/src/graphics/shapes.c
@@ -3,14 +3,14 @@
 
 #include <io.h>
 
-void draw_rectangle(uint32_t width, uint32_t height)
+void draw_rectangle(uint32_t width, uint32_t height, char ch)
 {
     /* Top edge */
     for (uint32_t i = 0; i < width; i++) {
         /* TODO: This character should be an argument such as
          *       `border_char`. Also, let's not forget about
          *       `border_width` */
-        printmsg("#");
+        printmsg("%c", ch);
     }
 
     for (uint32_t i = 0; i < height - 2; i++) {
@@ -24,11 +24,11 @@ void draw_rectangle(uint32_t width, uint32_t height)
         nudge_cursor(DOWN, 1);
 
         /* Left edges */
-        printmsg("#");
+        printmsg("%c", ch);
 
         /* Right edges */
         nudge_cursor(RIGHT, width - 2);
-        printmsg("#");
+        printmsg("%c", ch);
     }
 
     /* Get to the next line */
@@ -37,6 +37,6 @@ void draw_rectangle(uint32_t width, uint32_t height)
 
     /* Bottom edge */
     for (uint32_t i = 0; i < width; i++) {
-        printmsg("#");
+        printmsg("%c", ch);
     }
 }
diff --git a/src/main.c b/src/main.c
index 5ba1e4c..56f60a0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -83,21 +83,31 @@ int main(void)
     move_cursor(orig_cursor_pos);
 
     while ( 1 ) {
-
         /* Read a byte from the standard input */
         while ( read(STDIN_FILENO, &c, 1) < 1 );
 
-        if ( iscntrl(c) ) {
-            /* Control characters are non-printable,
-             * hence don't even try to print them */
-            printf("%d\r\n", c);
-
-        } else {
-            /* print character ascii values and
-             * show the characters as well */
-            printf("%d ('%c')\r\n", c, c);
-
+        if ( !iscntrl(c) ) {
             if ( c == 'q' ) break;
+            else if ( c == 'h' || c == 'j' || c == 'k' || c == 'l' ) {
+                orig_cursor_pos = get_cursor_pos();
+                erase(&rects[0]);
+                switch ( c ) {
+                case 'h':
+                    nudge(&rects[0], LEFT, 1);
+                    break;
+                case 'j':
+                    nudge(&rects[0], DOWN, 1);
+                    break;
+                case 'k':
+                    nudge(&rects[0], UP, 1);
+                    break;
+                case 'l':
+                    nudge(&rects[0], RIGHT, 1);
+                    break;
+                }
+                draw(&rects[0]);
+                move_cursor(orig_cursor_pos);
+            }
         }
     }
 
-- 
2.45.2