1 files changed, 93 insertions, 0 deletions
diff --git a/src/terminal/position.rs b/src/terminal/position.rs
new file mode 100644
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--- /dev/null
+++ b/src/terminal/position.rs
@@ -0,0 +1,93 @@
+/*
+ * bb
+ *
+ * Copyright 2019 Manos Pitsidianakis
+ *
+ * This file is part of bb.
+ *
+ * bb is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * bb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with bb. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*!
+Simple type definitions and macro helper for a (x,y) position on the terminal and the areas they define.
+
+An `Area` consists of two points: the upper left and bottom right corners.
+*/
+
+/// A `(x, y)` position on screen.
+pub type Pos = (usize, usize);
+
+#[inline(always)]
+pub fn get_x(p: Pos) -> usize {
+    p.0
+}
+#[inline(always)]
+pub fn get_y(p: Pos) -> usize {
+    p.1
+}
+#[inline(always)]
+pub fn set_x(p: Pos, new_x: usize) -> Pos {
+    (new_x, p.1)
+}
+#[inline(always)]
+pub fn set_y(p: Pos, new_y: usize) -> Pos {
+    (p.0, new_y)
+}
+#[inline(always)]
+pub fn pos_inc(p: Pos, inc: (usize, usize)) -> Pos {
+    (p.0 + inc.0, p.1 + inc.1)
+}
+
+#[inline(always)]
+pub fn pos_dec(p: Pos, dec: (usize, usize)) -> Pos {
+    (p.0.saturating_sub(dec.0), p.1.saturating_sub(dec.1))
+}
+
+pub type Area = (Pos, Pos);
+#[macro_export]
+macro_rules! height {
+    ($a:expr) => {
+        (get_y(bottom_right!($a))).saturating_sub(get_y(upper_left!($a)))
+    };
+}
+
+#[macro_export]
+macro_rules! width {
+    ($a:expr) => {
+        (get_x(bottom_right!($a))).saturating_sub(get_x(upper_left!($a)))
+    };
+}
+
+#[macro_export]
+macro_rules! upper_left {
+    ($a:expr) => {
+        $a.0
+    };
+}
+
+#[macro_export]
+macro_rules! bottom_right {
+    ($a:expr) => {
+        $a.1
+    };
+}
+
+#[macro_export]
+macro_rules! is_valid_area {
+    ($a:expr) => {{
+        let upper_left = upper_left!($a);
+        let bottom_right = bottom_right!($a);
+        !(get_y(upper_left) > get_y(bottom_right) || get_x(upper_left) > get_x(bottom_right))
+    }};
+}