Cargo.lock 🔗
@@ -4880,6 +4880,7 @@ dependencies = [
"editor",
"futures",
"gpui",
+ "itertools",
"mio-extras",
"ordered-float",
"project",
Fully functional background colors :D
Mikayla Maki created
Change summary
Cargo.lock | 1
crates/terminal/Cargo.toml | 2
crates/terminal/print256color.sh | 96 ++++++
crates/terminal/src/terminal_element.rs | 379 ++++++++++++++++----------
crates/terminal/truecolor.sh | 19 +
5 files changed, 353 insertions(+), 144 deletions(-)
Detailed changes
crates/terminal/Cargo.toml 🔗
@@ -20,6 +20,8 @@ smallvec = { version = "1.6", features = ["union"] }
mio-extras = "2.0.6"
futures = "0.3"
ordered-float = "2.1.1"
+itertools = "0.10"
+
[dev-dependencies]
gpui = { path = "../gpui", features = ["test-support"] }
crates/terminal/print256color.sh 🔗
@@ -0,0 +1,96 @@
+#!/bin/bash
+
+# Tom Hale, 2016. MIT Licence.
+# Print out 256 colours, with each number printed in its corresponding colour
+# See http://askubuntu.com/questions/821157/print-a-256-color-test-pattern-in-the-terminal/821163#821163
+
+set -eu # Fail on errors or undeclared variables
+
+printable_colours=256
+
+# Return a colour that contrasts with the given colour
+# Bash only does integer division, so keep it integral
+function contrast_colour {
+ local r g b luminance
+ colour="$1"
+
+ if (( colour < 16 )); then # Initial 16 ANSI colours
+ (( colour == 0 )) && printf "15" || printf "0"
+ return
+ fi
+
+ # Greyscale # rgb_R = rgb_G = rgb_B = (number - 232) * 10 + 8
+ if (( colour > 231 )); then # Greyscale ramp
+ (( colour < 244 )) && printf "15" || printf "0"
+ return
+ fi
+
+ # All other colours:
+ # 6x6x6 colour cube = 16 + 36*R + 6*G + B # Where RGB are [0..5]
+ # See http://stackoverflow.com/a/27165165/5353461
+
+ # r=$(( (colour-16) / 36 ))
+ g=$(( ((colour-16) % 36) / 6 ))
+ # b=$(( (colour-16) % 6 ))
+
+ # If luminance is bright, print number in black, white otherwise.
+ # Green contributes 587/1000 to human perceived luminance - ITU R-REC-BT.601
+ (( g > 2)) && printf "0" || printf "15"
+ return
+
+ # Uncomment the below for more precise luminance calculations
+
+ # # Calculate percieved brightness
+ # # See https://www.w3.org/TR/AERT#color-contrast
+ # # and http://www.itu.int/rec/R-REC-BT.601
+ # # Luminance is in range 0..5000 as each value is 0..5
+ # luminance=$(( (r * 299) + (g * 587) + (b * 114) ))
+ # (( $luminance > 2500 )) && printf "0" || printf "15"
+}
+
+# Print a coloured block with the number of that colour
+function print_colour {
+ local colour="$1" contrast
+ contrast=$(contrast_colour "$1")
+ printf "\e[48;5;%sm" "$colour" # Start block of colour
+ printf "\e[38;5;%sm%3d" "$contrast" "$colour" # In contrast, print number
+ printf "\e[0m " # Reset colour
+}
+
+# Starting at $1, print a run of $2 colours
+function print_run {
+ local i
+ for (( i = "$1"; i < "$1" + "$2" && i < printable_colours; i++ )) do
+ print_colour "$i"
+ done
+ printf " "
+}
+
+# Print blocks of colours
+function print_blocks {
+ local start="$1" i
+ local end="$2" # inclusive
+ local block_cols="$3"
+ local block_rows="$4"
+ local blocks_per_line="$5"
+ local block_length=$((block_cols * block_rows))
+
+ # Print sets of blocks
+ for (( i = start; i <= end; i += (blocks_per_line-1) * block_length )) do
+ printf "\n" # Space before each set of blocks
+ # For each block row
+ for (( row = 0; row < block_rows; row++ )) do
+ # Print block columns for all blocks on the line
+ for (( block = 0; block < blocks_per_line; block++ )) do
+ print_run $(( i + (block * block_length) )) "$block_cols"
+ done
+ (( i += block_cols )) # Prepare to print the next row
+ printf "\n"
+ done
+ done
+}
+
+print_run 0 16 # The first 16 colours are spread over the whole spectrum
+printf "\n"
+print_blocks 16 231 6 6 3 # 6x6x6 colour cube between 16 and 231 inclusive
+print_blocks 232 255 12 2 1 # Not 50, but 24 Shades of Grey
crates/terminal/src/terminal_element.rs 🔗
@@ -14,37 +14,74 @@ use gpui::{
geometry::{rect::RectF, vector::vec2f},
json::json,
text_layout::Line,
- Event, MouseRegion, PaintContext, Quad, WeakViewHandle,
+ Event, FontCache, MouseRegion, PaintContext, Quad, SizeConstraint, WeakViewHandle,
};
+use itertools::Itertools;
use ordered_float::OrderedFloat;
use settings::Settings;
-use std::rc::Rc;
+use std::{iter, rc::Rc};
use theme::TerminalStyle;
use crate::{Input, ScrollTerminal, Terminal};
+///Scrolling is unbearably sluggish by default. Alacritty supports a configurable
+///Scroll multiplier that is set to 3 by default. This will be removed when I
+///Implement scroll bars.
const ALACRITTY_SCROLL_MULTIPLIER: f32 = 3.;
+///Used to display the grid as passed to Alacritty and the TTY.
+///Useful for debugging inconsistencies between behavior and display
#[cfg(debug_assertions)]
const DEBUG_GRID: bool = false;
+///The GPUI element that paints the terminal.
pub struct TerminalEl {
view: WeakViewHandle<Terminal>,
}
-impl TerminalEl {
- pub fn new(view: WeakViewHandle<Terminal>) -> TerminalEl {
- TerminalEl { view }
+///Represents a span of cells in a single line in the terminal's grid.
+///This is used for drawing background rectangles
+#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, PartialOrd, Ord)]
+pub struct LineSpan {
+ start: i32,
+ end: i32,
+ line: usize,
+ color: Color,
+}
+
+impl LineSpan {
+ ///Creates a new LineSpan. `start` must be <= `end`.
+ ///If `start` == `end`, then this span is considered to be over a
+ /// single cell
+ fn new(start: i32, end: i32, line: usize, color: Color) -> LineSpan {
+ debug_assert!(start <= end);
+ LineSpan {
+ start,
+ end,
+ line,
+ color,
+ }
}
}
+struct CellWidth(f32);
+struct LineHeight(f32);
+
+///The information generated during layout that is nescessary for painting
pub struct LayoutState {
lines: Vec<Line>,
- line_height: f32,
- em_width: f32,
+ line_height: LineHeight,
+ em_width: CellWidth,
cursor: Option<(RectF, Color)>,
cur_size: SizeInfo,
background_color: Color,
+ background_rects: Vec<(RectF, Color)>, //Vec index == Line index for the LineSpan
+}
+
+impl TerminalEl {
+ pub fn new(view: WeakViewHandle<Terminal>) -> TerminalEl {
+ TerminalEl { view }
+ }
}
impl Element for TerminalEl {
@@ -56,73 +93,56 @@ impl Element for TerminalEl {
constraint: gpui::SizeConstraint,
cx: &mut gpui::LayoutContext,
) -> (gpui::geometry::vector::Vector2F, Self::LayoutState) {
- let view = self.view.upgrade(cx).unwrap();
- let size = constraint.max;
- let settings = cx.global::<Settings>();
- let editor_theme = &settings.theme.editor;
- let font_cache = cx.font_cache();
-
- //Set up text rendering
- let text_style = TextStyle {
- color: editor_theme.text_color,
- font_family_id: settings.buffer_font_family,
- font_family_name: font_cache.family_name(settings.buffer_font_family).unwrap(),
- font_id: font_cache
- .select_font(settings.buffer_font_family, &Default::default())
- .unwrap(),
- font_size: settings.buffer_font_size,
- font_properties: Default::default(),
- underline: Default::default(),
- };
-
- let line_height = font_cache.line_height(text_style.font_size);
- let cell_width = font_cache.em_advance(text_style.font_id, text_style.font_size);
-
- let new_size = SizeInfo::new(
- size.x() - cell_width,
- size.y(),
- cell_width,
- line_height,
- 0.,
- 0.,
- false,
+ //Settings immutably borrows cx here for the settings and font cache
+ //and we need to modify the cx to resize the terminal. So instead of
+ //storing Settings or the font_cache(), we toss them ASAP and then reborrow later
+ let text_style = make_text_style(cx.font_cache(), cx.global::<Settings>());
+ let line_height = LineHeight(cx.font_cache().line_height(text_style.font_size));
+ let cell_width = CellWidth(
+ cx.font_cache()
+ .em_advance(text_style.font_id, text_style.font_size),
);
- view.update(cx.app, |view, _cx| {
- view.set_size(new_size);
- });
+ let view_handle = self.view.upgrade(cx).unwrap();
- let settings = cx.global::<Settings>();
- let terminal_theme = &settings.theme.terminal;
- let term = view.read(cx).term.lock();
+ //Tell the view our new size. Requires a mutable borrow of cx and the view
+ let cur_size = make_new_size(constraint, &cell_width, &line_height);
+ //Note that set_size locks and mutates the terminal.
+ //TODO: Would be nice to lock once for the whole of layout
+ view_handle.update(cx.app, |view, _cx| view.set_size(cur_size));
+ //Now that we're done with the mutable portion, grab the immutable settings and view again
+ let terminal_theme = &(cx.global::<Settings>()).theme.terminal;
+ let term = view_handle.read(cx).term.lock();
let content = term.renderable_content();
- let (chunks, line_count) = build_chunks(content.display_iter, &terminal_theme);
+ //And we're off! Begin layouting
+ let (chunks, line_count) = build_chunks(content.display_iter, &terminal_theme);
+ let backgrounds = chunks
+ .iter()
+ .filter(|(_, _, line_span)| line_span != &LineSpan::default())
+ .map(|(_, _, line_span)| *line_span)
+ .collect();
let shaped_lines = layout_highlighted_chunks(
- chunks.iter().map(|(text, style)| (text.as_str(), *style)),
+ chunks
+ .iter()
+ .map(|(text, style, _)| (text.as_str(), *style)),
&text_style,
cx.text_layout_cache,
- &cx.font_cache,
+ cx.font_cache(),
usize::MAX,
line_count,
);
- let cursor_line = content.cursor.point.line.0 + content.display_offset as i32;
- let mut cursor = None;
- if let Some(layout_line) = cursor_line
- .try_into()
- .ok()
- .and_then(|cursor_line: usize| shaped_lines.get(cursor_line))
- {
- let cursor_x = layout_line.x_for_index(content.cursor.point.column.0);
- cursor = Some((
- RectF::new(
- vec2f(cursor_x, cursor_line as f32 * line_height),
- vec2f(cell_width, line_height),
- ),
- terminal_theme.cursor,
- ));
- }
+ let background_rects = make_background_rects(backgrounds, &shaped_lines, &line_height);
+
+ let cursor = make_cursor_rect(
+ content.cursor.point,
+ &shaped_lines,
+ content.display_offset,
+ &line_height,
+ &cell_width,
+ )
+ .map(|cursor_rect| (cursor_rect, terminal_theme.cursor));
(
constraint.max,
@@ -131,7 +151,8 @@ impl Element for TerminalEl {
line_height,
em_width: cell_width,
cursor,
- cur_size: new_size,
+ cur_size,
+ background_rects,
background_color: terminal_theme.background,
},
)
@@ -148,44 +169,47 @@ impl Element for TerminalEl {
cx.scene.push_mouse_region(MouseRegion {
view_id: self.view.id(),
- discriminant: None,
- bounds: visible_bounds,
- hover: None,
mouse_down: Some(Rc::new(|_, cx| cx.focus_parent_view())),
- click: None,
- right_mouse_down: None,
- right_click: None,
- drag: None,
- mouse_down_out: None,
- right_mouse_down_out: None,
+ bounds: visible_bounds,
+ ..Default::default()
});
- //Background
+ let origin = bounds.origin() + vec2f(layout.em_width.0, 0.);
+
+ //Start us off with a nice simple background color
cx.scene.push_quad(Quad {
- bounds: visible_bounds,
+ bounds: RectF::new(bounds.origin(), bounds.size()),
background: Some(layout.background_color),
border: Default::default(),
corner_radius: 0.,
});
- let origin = bounds.origin() + vec2f(layout.em_width, 0.); //Padding
+ //Draw cell backgrounds
+ for background_rect in &layout.background_rects {
+ let new_origin = origin + background_rect.0.origin();
+ cx.scene.push_quad(Quad {
+ bounds: RectF::new(new_origin, background_rect.0.size()),
+ background: Some(background_rect.1),
+ border: Default::default(),
+ corner_radius: 0.,
+ })
+ }
- let mut line_origin = origin;
+ //Draw text
+ let mut line_origin = origin.clone();
for line in &layout.lines {
- let boundaries = RectF::new(line_origin, vec2f(bounds.width(), layout.line_height));
-
+ let boundaries = RectF::new(line_origin, vec2f(bounds.width(), layout.line_height.0));
if boundaries.intersects(visible_bounds) {
- line.paint(line_origin, visible_bounds, layout.line_height, cx);
+ line.paint(line_origin, visible_bounds, layout.line_height.0, cx);
}
-
line_origin.set_y(boundaries.max_y());
}
+ //Draw cursor
if let Some((c, color)) = layout.cursor {
let new_origin = origin + c.origin();
- let new_cursor = RectF::new(new_origin, c.size());
cx.scene.push_quad(Quad {
- bounds: new_cursor,
+ bounds: RectF::new(new_origin, c.size()),
background: Some(color),
border: Default::default(),
corner_radius: 0.,
@@ -215,7 +239,7 @@ impl Element for TerminalEl {
} => {
if visible_bounds.contains_point(*position) {
let vertical_scroll =
- (delta.y() / layout.line_height) * ALACRITTY_SCROLL_MULTIPLIER;
+ (delta.y() / layout.line_height.0) * ALACRITTY_SCROLL_MULTIPLIER;
cx.dispatch_action(ScrollTerminal(vertical_scroll.round() as i32));
true
} else {
@@ -249,67 +273,134 @@ impl Element for TerminalEl {
}
}
+fn make_text_style(font_cache: &FontCache, settings: &Settings) -> TextStyle {
+ TextStyle {
+ color: settings.theme.editor.text_color,
+ font_family_id: settings.buffer_font_family,
+ font_family_name: font_cache.family_name(settings.buffer_font_family).unwrap(),
+ font_id: font_cache
+ .select_font(settings.buffer_font_family, &Default::default())
+ .unwrap(),
+ font_size: settings.buffer_font_size,
+ font_properties: Default::default(),
+ underline: Default::default(),
+ }
+}
+
+fn make_new_size(
+ constraint: SizeConstraint,
+ cell_width: &CellWidth,
+ line_height: &LineHeight,
+) -> SizeInfo {
+ SizeInfo::new(
+ constraint.max.x() - cell_width.0,
+ constraint.max.y(),
+ cell_width.0,
+ line_height.0,
+ 0.,
+ 0.,
+ false,
+ )
+}
+
pub(crate) fn build_chunks(
grid_iterator: GridIterator<Cell>,
theme: &TerminalStyle,
-) -> (Vec<(String, Option<HighlightStyle>)>, usize) {
- let mut lines: Vec<(String, Option<HighlightStyle>)> = vec![];
- let mut last_line = 0;
- let mut line_count = 1;
- let mut cur_chunk = String::new();
-
- let mut cur_highlight = HighlightStyle {
- color: Some(Color::white()),
- ..Default::default()
- };
-
- for cell in grid_iterator {
- let Indexed {
- point: Point { line, .. },
- cell: Cell {
- c, fg, flags, .. // TODO: Add bg and flags
- }, //TODO: Learn what 'CellExtra does'
- } = cell;
-
- let new_highlight = make_style_from_cell(fg, flags, theme);
-
- if line != last_line {
+) -> (Vec<(String, Option<HighlightStyle>, LineSpan)>, usize) {
+ let mut line_count: usize = 0;
+ let lines = grid_iterator.group_by(|i| i.point.line.0);
+ let result = lines
+ .into_iter()
+ .map(|(_, line)| {
line_count += 1;
- cur_chunk.push('\n');
- last_line = line.0;
- }
-
- if new_highlight != cur_highlight {
- lines.push((cur_chunk.clone(), Some(cur_highlight.clone())));
- cur_chunk.clear();
- cur_highlight = new_highlight;
- }
- cur_chunk.push(*c)
- }
- lines.push((cur_chunk, Some(cur_highlight)));
- (lines, line_count)
+ let mut col_index = 0;
+
+ let chunks = line.group_by(|i| cell_style(&i, theme));
+ chunks
+ .into_iter()
+ .map(|(style, fragment)| {
+ let str_fragment = fragment.map(|indexed| indexed.c).collect::<String>();
+ let start = col_index;
+ let end = start + str_fragment.len() as i32;
+ col_index = end;
+ (
+ str_fragment,
+ Some(style.0),
+ LineSpan::new(start, end, line_count - 1, style.1), //Line count -> Line index
+ )
+ })
+ .chain(iter::once(("\n".to_string(), None, Default::default())))
+ .collect::<Vec<(String, Option<HighlightStyle>, LineSpan)>>()
+ })
+ .flatten()
+ .collect::<Vec<(String, Option<HighlightStyle>, LineSpan)>>();
+ (result, line_count)
}
-fn make_style_from_cell(fg: &AnsiColor, flags: &Flags, style: &TerminalStyle) -> HighlightStyle {
- let fg = Some(alac_color_to_gpui_color(fg, style));
- let underline = if flags.contains(Flags::UNDERLINE) {
- Some(Underline {
- color: fg,
- squiggly: false,
- thickness: OrderedFloat(1.),
+fn make_background_rects(
+ backgrounds: Vec<LineSpan>,
+ shaped_lines: &Vec<Line>,
+ line_height: &LineHeight,
+) -> Vec<(RectF, Color)> {
+ backgrounds
+ .into_iter()
+ .map(|line_span| {
+ let line = shaped_lines
+ .get(line_span.line)
+ .expect("Background line_num did not correspond to a line number");
+ let x = line.x_for_index(line_span.start as usize);
+ let width = line.x_for_index(line_span.end as usize) - x;
+ (
+ RectF::new(
+ vec2f(x, line_span.line as f32 * line_height.0),
+ vec2f(width, line_height.0),
+ ),
+ line_span.color,
+ )
})
- } else {
- None
- };
- HighlightStyle {
+ .collect::<Vec<(RectF, Color)>>()
+}
+
+fn make_cursor_rect(
+ cursor_point: Point,
+ shaped_lines: &Vec<Line>,
+ display_offset: usize,
+ line_height: &LineHeight,
+ cell_width: &CellWidth,
+) -> Option<RectF> {
+ let cursor_line = cursor_point.line.0 as usize + display_offset;
+ shaped_lines.get(cursor_line).map(|layout_line| {
+ let cursor_x = layout_line.x_for_index(cursor_point.column.0);
+ RectF::new(
+ vec2f(cursor_x, cursor_line as f32 * line_height.0),
+ vec2f(cell_width.0, line_height.0),
+ )
+ })
+}
+
+fn cell_style(indexed: &Indexed<&Cell>, style: &TerminalStyle) -> (HighlightStyle, Color) {
+ let flags = indexed.cell.flags;
+ let fg = Some(alac_color_to_gpui_color(&indexed.cell.fg, style));
+ let bg = alac_color_to_gpui_color(&indexed.cell.bg, style);
+
+ let underline = flags.contains(Flags::UNDERLINE).then(|| Underline {
color: fg,
- underline,
- ..Default::default()
- }
+ squiggly: false,
+ thickness: OrderedFloat(1.),
+ });
+
+ (
+ HighlightStyle {
+ color: fg,
+ underline,
+ ..Default::default()
+ },
+ bg,
+ )
}
-fn alac_color_to_gpui_color(allac_color: &AnsiColor, style: &TerminalStyle) -> Color {
- match allac_color {
+fn alac_color_to_gpui_color(alac_color: &AnsiColor, style: &TerminalStyle) -> Color {
+ match alac_color {
alacritty_terminal::ansi::Color::Named(n) => match n {
alacritty_terminal::ansi::NamedColor::Black => style.black,
alacritty_terminal::ansi::NamedColor::Red => style.red,
@@ -341,7 +432,7 @@ fn alac_color_to_gpui_color(allac_color: &AnsiColor, style: &TerminalStyle) -> C
alacritty_terminal::ansi::NamedColor::BrightForeground => style.bright_foreground,
alacritty_terminal::ansi::NamedColor::DimForeground => style.dim_foreground,
}, //Theme defined
- alacritty_terminal::ansi::Color::Spec(rgb) => Color::new(rgb.r, rgb.g, rgb.b, 1),
+ alacritty_terminal::ansi::Color::Spec(rgb) => Color::new(rgb.r, rgb.g, rgb.b, u8::MAX),
alacritty_terminal::ansi::Color::Indexed(i) => get_color_at_index(i, style), //Color cube weirdness
}
}
@@ -366,14 +457,14 @@ pub fn get_color_at_index(index: &u8, style: &TerminalStyle) -> Color {
15 => style.bright_white,
16..=231 => {
let (r, g, b) = rgb_for_index(index); //Split the index into it's rgb components
- let step = (u8::MAX as f32 / 5.).round() as u8; //Split the GPUI range into 5 chunks
- Color::new(r * step, g * step, b * step, 1) //Map the rgb components to GPUI's range
+ let step = (u8::MAX as f32 / 5.).floor() as u8; //Split the 256 channel range into 5 chunks
+ Color::new(r * step, g * step, b * step, u8::MAX) //Map the [0, 5] rgb components to the [0, 256] channel range
}
//Grayscale from black to white, 0 to 24
232..=255 => {
- let i = 24 - (index - 232); //Align index to 24..0
- let step = (u8::MAX as f32 / 24.).round() as u8; //Split the 256 range grayscale into 24 chunks
- Color::new(i * step, i * step, i * step, 1) //Map the rgb components to GPUI's range
+ let i = index - 232; //Align index to 0..24
+ let step = (u8::MAX as f32 / 24.).floor() as u8; //Split the [0,256] range grayscale values into 24 chunks
+ Color::new(i * step, i * step, i * step, u8::MAX) //Map the rgb components to the grayscale range
}
}
}
@@ -400,10 +491,10 @@ fn draw_debug_grid(bounds: RectF, layout: &mut LayoutState, cx: &mut PaintContex
let width = layout.cur_size.width();
let height = layout.cur_size.height();
//Alacritty uses 'as usize', so shall we.
- for col in 0..(width / layout.em_width).round() as usize {
+ for col in 0..(width / layout.em_width.0).round() as usize {
cx.scene.push_quad(Quad {
bounds: RectF::new(
- bounds.origin() + vec2f((col + 1) as f32 * layout.em_width, 0.),
+ bounds.origin() + vec2f((col + 1) as f32 * layout.em_width.0, 0.),
vec2f(1., height),
),
background: Some(Color::green()),
@@ -411,10 +502,10 @@ fn draw_debug_grid(bounds: RectF, layout: &mut LayoutState, cx: &mut PaintContex
corner_radius: 0.,
});
}
- for row in 0..((height / layout.line_height) + 1.0).round() as usize {
+ for row in 0..((height / layout.line_height.0) + 1.0).round() as usize {
cx.scene.push_quad(Quad {
bounds: RectF::new(
- bounds.origin() + vec2f(layout.em_width, row as f32 * layout.line_height),
+ bounds.origin() + vec2f(layout.em_width.0, row as f32 * layout.line_height.0),
vec2f(width, 1.),
),
background: Some(Color::green()),
crates/terminal/truecolor.sh 🔗
@@ -0,0 +1,19 @@
+#!/bin/bash
+# Copied from: https://unix.stackexchange.com/a/696756
+# Based on: https://gist.github.com/XVilka/8346728 and https://unix.stackexchange.com/a/404415/395213
+
+awk -v term_cols="${width:-$(tput cols || echo 80)}" -v term_lines="${height:-1}" 'BEGIN{
+ s="/\\";
+ total_cols=term_cols*term_lines;
+ for (colnum = 0; colnum<total_cols; colnum++) {
+ r = 255-(colnum*255/total_cols);
+ g = (colnum*510/total_cols);
+ b = (colnum*255/total_cols);
+ if (g>255) g = 510-g;
+ printf "\033[48;2;%d;%d;%dm", r,g,b;
+ printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
+ printf "%s\033[0m", substr(s,colnum%2+1,1);
+ if (colnum%term_cols==term_cols) printf "\n";
+ }
+ printf "\n";
+}'