implemented movement by paragraph

src/main.odin

@@ -1,3 +1,16 @@
+/*
+- TODO implement movement up and down by paragraph
+- TODO implement scrolling/viewport
+- TODO implement deletion by word
+- TODO implement selection
+- TODO implement duplicate selection/line
+- TODO implement move selection/line up/down
+- TODO implement copy/cut/paste
+- TODO implement search
+- TODO implement file picker
+- TODO implement "execute" command
+*/
+
 package main
 
 import "core:fmt"
@@ -24,21 +37,6 @@ text_height: f32
 cursor: Cursor
 lines: [dynamic][dynamic]u8
 
-render_cursor :: proc(cursor: ^Cursor) {
-	x := cursor.char * int(font_size / 2)
-	y := i32(font_size) * i32(cursor.line)
-	r.DrawLine(i32(x), y, i32(x), y + i32(text_height), r.WHITE)
-	r.DrawLine(i32(x) + 1, y, i32(x) + 1, y + i32(text_height), r.WHITE)
-}
-
-current_line :: proc() -> ^[dynamic]u8 {
-	return &lines[cursor.line]
-}
-
-is_whitespace :: proc(c: u8) -> bool {
-	return c == ' ' || c == '\t' || c == '\n'
-}
-
 main :: proc() {
 	r.InitWindow(800, 600, "odit")
 	r.SetTargetFPS(60)
@@ -65,7 +63,7 @@ main :: proc() {
 			cursor.char += 1
 		}
 
-		if r.IsKeyPressed(r.KeyboardKey.RIGHT) {
+		if repeatable_key_pressed(r.KeyboardKey.RIGHT) {
 			preferred_position := cursor.char + 1
 			if cursor.char == len(current_line()) && cursor.line != len(lines) - 1 {
 				cursor.char = 0
@@ -89,13 +87,13 @@ main :: proc() {
 			cursor.char = min(preferred_position, len(current_line()))
 		}
 
-		if r.IsKeyPressed(r.KeyboardKey.LEFT) {
+		if repeatable_key_pressed(r.KeyboardKey.LEFT) {
 			preferred_position := cursor.char - 1
 			if cursor.char == 0 && cursor.line != 0 {
 				cursor.line -= 1
 				cursor.char = len(current_line())
 			}
-			if r.IsKeyDown(r.KeyboardKey.LEFT_ALT) && 0 <= cursor.char - 1 {
+			if r.IsKeyDown(r.KeyboardKey.LEFT_ALT) && 0 < cursor.char {
 				seen_space := false
 				#reverse for c, c_index in current_line()[:cursor.char - 1] {
 					if is_whitespace(c) {
@@ -111,19 +109,43 @@ main :: proc() {
 			cursor.char = max(preferred_position, 0)
 		}
 
-		if r.IsKeyPressed(r.KeyboardKey.UP) {
-			cursor.line -= 1
+		if repeatable_key_pressed(r.KeyboardKey.UP) {
+			preferred_line := cursor.line - 1
+
+			if r.IsKeyDown(r.KeyboardKey.LEFT_ALT) && 0 < cursor.line {
+				#reverse for l, l_index in lines[:cursor.line] {
+					if len(l) == 0 || all_whitespace(l[:]) {
+						preferred_line = l_index
+						break
+					}
+				}
+			}
+
+			cursor.line = max(0, preferred_line)
 			if len(current_line()) < cursor.char {
 				cursor.char = len(current_line())
 			}
 		}
-		if r.IsKeyPressed(r.KeyboardKey.DOWN) {
-			cursor.line += 1
+
+		if repeatable_key_pressed(r.KeyboardKey.DOWN) {
+			preferred_line := cursor.line + 1
+
+			if r.IsKeyDown(r.KeyboardKey.LEFT_ALT) && cursor.line + 1 < len(lines) {
+				for l, l_index in lines[cursor.line + 1:] {
+					if len(l) == 0 || all_whitespace(l[:]) {
+						preferred_line = cursor.line + l_index + 1
+						break
+					}
+				}
+			}
+
+			cursor.line = min(preferred_line, len(lines))
 			if len(current_line()) < cursor.char {
 				cursor.char = len(current_line())
 			}
 		}
-		if r.IsKeyPressed(r.KeyboardKey.ENTER) {
+
+		if repeatable_key_pressed(r.KeyboardKey.ENTER) {
 			new_line_cap := len(current_line()) - cursor.char
 			bs := make([dynamic]u8, 0, len(current_line()) == 0 ? 1 : new_line_cap * 2)
 			if cursor.char < len(current_line()) {
@@ -136,6 +158,7 @@ main :: proc() {
 			cursor.line += 1
 			cursor.char = 0
 		}
+
 		if r.IsKeyDown(r.KeyboardKey.LEFT_SUPER) && r.IsKeyPressed(r.KeyboardKey.S) {
 			builder := strings.builder_make()
 			defer strings.builder_destroy(&builder)
@@ -146,7 +169,8 @@ main :: proc() {
 			os.write_entire_file("foo.txt", transmute([]u8)strings.to_string(builder))
 			fmt.println("Wrote file!")
 		}
-		if r.IsKeyPressed(r.KeyboardKey.BACKSPACE) {
+
+		if repeatable_key_pressed(r.KeyboardKey.BACKSPACE) {
 			if cursor.line == 0 && cursor.char == 0 do continue
 			if cursor.char == 0 {
 				old_len := len(lines[cursor.line - 1])
@@ -189,3 +213,32 @@ main :: proc() {
 		dirty = false
 	}
 }
+
+render_cursor :: proc(cursor: ^Cursor) {
+	x := cursor.char * int(font_size / 2)
+	y := i32(font_size) * i32(cursor.line)
+	r.DrawLine(i32(x), y, i32(x), y + i32(text_height), r.WHITE)
+	r.DrawLine(i32(x) + 1, y, i32(x) + 1, y + i32(text_height), r.WHITE)
+}
+
+current_line :: proc() -> ^[dynamic]u8 {
+	return &lines[cursor.line]
+}
+
+is_whitespace :: proc(c: u8) -> bool {
+	return c == ' ' || c == '\t' || c == '\n'
+}
+
+all_whitespace :: proc(cs: []u8) -> bool {
+	for c in cs {
+		if !is_whitespace(c) {
+			return false
+		}
+	}
+
+	return true
+}
+
+repeatable_key_pressed :: proc(k: r.KeyboardKey) -> bool {
+	return r.IsKeyPressed(k) || r.IsKeyPressedRepeat(k)
+}