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defining some terms, prepare to have helpers for active vs history

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This commit is contained in:
Mitchell Hashimoto
2022-07-11 07:55:10 -07:00
parent 7213bfb14a
commit 45992ff9c9
1 changed files with 12 additions and 3 deletions
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15
src/terminal/Screen.zig
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@ -1,5 +1,14 @@
//! Screen represents the internal storage for a terminal screen, including
//! scrollback. This is implemented as a single continuous ring buffer.
//!
//! Definitions:
//!
//! * Active - The area that is the current edit-able screen.
//! * History - The area that contains lines from prior input.
//! * Display - The area that is currently visible to the user. If the
//! user is scrolled all the way down (latest) then the display
//! is equivalent to the active area.
//!
const Screen = @This();
// FUTURE: Today this is implemented as a single contiguous ring buffer.
@ -123,7 +132,7 @@ pub fn getVisible(self: Screen) []Cell {
return self.storage;
}
/// Get a single row by index (0-indexed).
/// Get a single row in the active area by index (0-indexed).
pub fn getRow(self: Screen, idx: usize) Row {
// Get the index of the first byte of the the row at index.
const real_idx = self.rowIndex(idx);
@ -132,7 +141,7 @@ pub fn getRow(self: Screen, idx: usize) Row {
return self.storage[real_idx .. real_idx + self.cols];
}
/// Get a single cell in the visible area. row and col are 0-indexed.
/// Get a single cell in the active area. row and col are 0-indexed.
pub fn getCell(self: Screen, row: usize, col: usize) *Cell {
assert(row < self.rows);
assert(col < self.cols);
@ -142,7 +151,7 @@ pub fn getCell(self: Screen, row: usize, col: usize) *Cell {
/// Returns the index for the given row (0-indexed) into the underlying
/// storage array.
pub fn rowIndex(self: Screen, idx: usize) usize {
fn rowIndex(self: Screen, idx: usize) usize {
assert(idx < self.rows);
const val = (self.top + self.visible_offset + idx) * self.cols;
if (val < self.storage.len) return val;