Editing in Space
macOS 12.0+
1Kyoto, April 3–7
2Ryokan: Tsukimi
3
4Day 1
5- Shinkansen from Tokyo at 9:30
6- Check in at Tsukimi by 3 pm
7- Nishiki Market for lunch
8- Philosopher's Path at dusk
9
10Day 2
11- Fushimi Inari at sunrise
12- Bamboo grove in Arashiyama
13- Tea in Uji
14
15Day 3
16- Kiyomizu-dera in the morning
17- Gion after dark
18
19Day 4
20- Day trip to Nara
21- Deer park and Todai-ji
22
23Day 5
24- A last walk by the Kamo River
25- Train home at 4:10
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220use std::fs;
use std::path::Path;
fn main() {
let path = Path::new("Kyoto.txt");
let Some(note) = Note::open(path) else {
eprintln!("Can't open {path:?}");
return;
};
println!("{}", note.summary());
}
/// Titles longer than this are cut short.
const MAX_TITLE: usize = 40;
/// A note from the shelf.
#[derive(Debug, Clone)]
pub struct Note {
pub title: String,
pub body: String,
pub tags: Vec<String>,
}
impl Note {
/// Reads a note from the first file at `path`.
pub fn open(path: &Path) -> Option<Self> {
let body = fs::read_to_string(path).ok()?;
let name = path.file_stem()?.to_string_lossy();
let mut note = Self::new(name.as_ref(), &body);
note.add_tag("imported");
Some(note)
}
/// Makes a note, its title cut to fit the shelf label.
pub fn new(title: &str, body: &str) -> Self {
Note {
title: title.chars().take(MAX_TITLE).collect(),
body: body.to_string(),
tags: Vec::new(),
}
}
/// The first line, cut to fit the shelf label.
pub fn summary(&self) -> String {
let first = self.first_line();
let mut cut: String = first.chars().take(72).collect();
if first.chars().count() > 72 {
cut.push_str("...");
}
cut
}
pub fn first_line(&self) -> &str {
self.body.lines().next().unwrap_or("").trim()
}
pub fn word_count(&self) -> usize {
self.body.split_whitespace().count()
}
/// The numbers of the lines that hold `needle`.
pub fn search(&self, needle: &str) -> Vec<usize> {
let mut found = Vec::new();
for (index, line) in self.body.lines().enumerate() {
if line.contains(needle) {
found.push(index + 1);
}
}
found
}
pub fn tag_line(&self) -> String {
self.tags.join(", ")
}
pub fn add_tag(&mut self, tag: &str) {
let tag = tag.trim().to_lowercase();
if !tag.is_empty() && !self.tags.contains(&tag) {
self.tags.push(tag);
}
}
pub fn mood(&self) -> Mood {
Mood::from_line(self.first_line())
}
pub fn longest_line(&self) -> usize {
self.body
.lines()
.map(|line| line.chars().count())
.max()
.unwrap_or(0)
}
pub fn title_len(&self) -> usize {
self.title.chars().count()
}
/// Writes the body back, as the editor's Save does.
pub fn save(&self, path: &Path) -> std::io::Result<()> {
fs::write(path, self.body.as_bytes())
}
/// The body with a number before each line.
pub fn marked_lines(&self) -> String {
let mut out = String::new();
for (index, line) in self.body.lines().enumerate() {
out.push_str(&(index + 1).to_string());
out.push_str(" ");
out.push_str(line);
out.push('\n');
}
out
}
}
/// A few notes kept together, as the shelf shows them.
#[derive(Debug, Default)]
pub struct Shelf {
pub notes: Vec<Note>,
}
impl Shelf {
pub fn add(&mut self, note: Note) {
self.notes.push(note);
}
pub fn words(&self) -> usize {
self.notes.iter().map(Note::word_count).sum()
}
pub fn find(&self, word: &str) -> Vec<&Note> {
self.notes
.iter()
.filter(|note| note.body.contains(word))
.collect()
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Mood {
Calm,
Curious,
Tired,
}
impl Mood {
fn from_line(line: &str) -> Self {
match line.trim() {
"calm" | "quiet" => Mood::Calm,
"curious" | "wonder" => Mood::Curious,
_ => Mood::Tired,
}
}
fn label(self) -> &'static str {
match self {
Mood::Calm => "calm",
Mood::Curious => "curious",
Mood::Tired => "tired",
}
}
}
#[cfg(test)]
mod tests {
use super::*;
fn sample() -> Note {
Note::new("Kyoto", "Quiet morning\nA train leaves\n")
}
#[test]
fn reads_the_first_line() {
let note = sample();
assert_eq!(note.first_line(), "Quiet morning");
}
#[test]
fn counts_words() {
let note = sample();
assert_eq!(note.word_count(), 5);
}
#[test]
fn finds_lines() {
let note = sample();
assert_eq!(note.search("train"), vec![2]);
}
#[test]
fn keeps_tags_unique() {
let mut note = sample();
note.add_tag("Kyoto");
note.add_tag("kyoto");
assert_eq!(note.tags, vec!["kyoto"]);
}
#[test]
fn cuts_a_long_title() {
let note = Note::new(&"x".repeat(80), "body");
assert_eq!(note.title_len(), MAX_TITLE);
}
#[test]
fn keeps_a_shelf() {
let mut shelf = Shelf::default();
shelf.add(sample());
assert_eq!(shelf.words(), 5);
assert_eq!(shelf.find("train").len(), 1);
}
#[test]
fn labels_a_mood() {
assert_eq!(Mood::from_line("quiet").label(), "calm");
assert_eq!(Mood::from_line("wonder").label(), "curious");
assert_eq!(Mood::from_line("late").label(), "tired");
}
}
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use std::fs;
use std::path::Path;
fn main() {
let path = Path::new("Kyoto.txt");
let Some(note) = Note::open(path) else {
eprintln!("Can't open {path:?}");
return;
};
println!("{}", note.title);
println!("{}", note.summary());
}
/// Titles longer than this are cut short.
const MAX_TITLE: usize = 40;
/// A note from the shelf.
#[derive(Debug, Clone)]
pub struct Note {
pub title: String,
pub body: String,
pub tags: Vec<String>,
}
impl Note {}
/// Reads a note from the first file at `path`.
pub fn open(path: &Path) -> Option<Self> {
let body = fs::read_to_string(path).ok()?;
let name = path.file_stem()?.to_string_lossy();
let mut note = Self::new(name.as_ref(), &body);
note.add_tag("imported");
Some(note)
}
/// Makes a note, its title cut to fit the shelf label.
pub fn new(title: &str, body: &str) -> Self {
Note {
title: title.chars().take(MAX_TITLE).collect(),
body: body.to_string(),
tags: Vec::new(),
}
}
/// The first line, cut to fit the shelf label.
pub fn summary(&self) -> String {
let first = self.first_line();
let mut cut: String = first.chars().take(72).collect();
if first.chars().count() > 72 {
cut.push_str("...");
}
cut
}
pub fn first_line(&self) -> &str {
self.body.lines().next().unwrap_or("").trim()
}
pub fn word_count(&self) -> usize {
self.body.split_whitespace().count()
}
/// The numbers of the lines that hold `needle`.
pub fn search(&self, needle: &str) -> Vec<usize> {
let mut found = Vec::new();
for (index, line) in self.body.lines().enumerate() {
if line.contains(needle) {
found.push(index + 1);
}
}
found
}
pub fn tag_line(&self) -> String {
self.tags.join(", ")
}
pub fn add_tag(&mut self, tag: &str) {
let tag = tag.trim().to_lowercase();
if !tag.is_empty() && !self.tags.contains(&tag) {
self.tags.push(tag);
}
}
pub fn mood(&self) -> Mood {
Mood::from_line(self.first_line())
}
pub fn longest_line(&self) -> usize {
self.body
.lines()
.map(|line| line.chars().count())
.max()
.unwrap_or(0)
}
pub fn title_len(&self) -> usize {
self.title.chars().count()
}
/// Writes the body back, as the editor's Save does.
pub fn save(&self, path: &Path) -> std::io::Result<()> {
fs::write(path, self.body.as_bytes())
}
/// The body with a number before each line.
pub fn marked_lines(&self) -> String {
let mut out = String::new();
for (index, line) in self.body.lines().enumerate() {
out.push_str(&(index + 1).to_string());
out.push_str(" ");
out.push_str(line);
out.push('\n');
}
out
}
}
/// A few notes kept together, as the shelf shows them.
#[derive(Debug, Default)]
pub struct Shelf {
pub notes: Vec<Note>,
}
impl Shelf {
pub fn add(&mut self, note: Note) {
self.notes.push(note);
}
pub fn words(&self) -> usize {
self.notes.iter().map(Note::word_count).sum()
}
pub fn find(&self, word: &str) -> Vec<&Note> {
self.notes
.iter()
.filter(|note| note.body.contains(word))
.collect()
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Mood {
Calm,
Curious,
Tired,
}
impl Mood {
fn from_line(line: &str) -> Self {
match line.trim() {
"calm" | "quiet" => Mood::Calm,
"curious" | "wonder" => Mood::Curious,
_ => Mood::Tired,
}
}
fn label(self) -> &'static str {
match self {
Mood::Calm => "calm",
Mood::Curious => "curious",
Mood::Tired => "tired",
}
}
}
#[cfg(test)]
mod tests {
use super::*;
fn sample() -> Note {
Note::new("Kyoto", "Quiet morning\nA train leaves\n")
}
#[test]
fn reads_the_first_line() {
let note = sample();
assert_eq!(note.first_line(), "Quiet morning");
}
#[test]
fn counts_words() {
let note = sample();
assert_eq!(note.word_count(), 5);
}
#[test]
fn finds_lines() {
let note = sample();
assert_eq!(note.search("train"), vec![2]);
}
#[test]
fn keeps_tags_unique() {
let mut note = sample();
note.add_tag("Kyoto");
note.add_tag("kyoto");
assert_eq!(note.tags, vec!["kyoto"]);
}
#[test]
fn cuts_a_long_title() {
let note = Note::new(&"x".repeat(80), "body");
assert_eq!(note.title_len(), MAX_TITLE);
}
#[test]
fn keeps_a_shelf() {
let mut shelf = Shelf::default();
shelf.add(sample());
assert_eq!(shelf.words(), 5);
assert_eq!(shelf.find("train").len(), 1);
}
#[test]
fn labels_a_mood() {
assert_eq!(Mood::from_line("quiet").label(), "calm");
assert_eq!(Mood::from_line("wonder").label(), "curious");
assert_eq!(Mood::from_line("late").label(), "tired");
}
}
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impl Note {
/// Reads a note from the first file at `path`.
pub fn open(path: &Path) -> Option<Self> {
let body = fs::read_to_string(path).ok()?;
let name = path.file_stem()?.to_string_lossy();
let mut note = Self::new(name.as_ref(), &body);
note.add_tag("imported");
Some(note)
}
/// Makes a note, its title cut to fit the shelf label.
pub fn new(title: &str, body: &str) -> Self {
Note {
title: title.chars().take(MAX_TITLE).collect(),
body: body.to_string(),
tags: Vec::new(),
}
}
/// The first line, cut to fit the shelf label.
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- tree-sitter-scheme
- tree-sitter-scss
- tree-sitter-slang
- tree-sitter-solidity
- tree-sitter-sparql
- tree-sitter-sql
- tree-sitter-ssh-config
- tree-sitter-starlark
- tree-sitter-svelte
- tree-sitter-swift
- tree-sitter-textproto
- tree-sitter-thrift
- tree-sitter-tlaplus
- tree-sitter-toml
- tree-sitter-typescript
- tree-sitter-typst
- tree-sitter-uiua
- tree-sitter-vb-dotnet
- tree-sitter-verilog
- tree-sitter-vhdl
- tree-sitter-vim
- tree-sitter-vue
- tree-sitter-wat
- tree-sitter-wit
- tree-sitter-xml
- tree-sitter-yaml
- tree-sitter-yuri
- tree-sitter-zig
- tree-sitter-zsh
- typenum
- ucd-trie
- unicase
- Unicode data
- unicode-bidi
- unicode-ident
- unicode-linebreak
- unicode-normalization
- unicode-script
- unicode-segmentation
- unicode-vo
- unicode-width
- url
- utf8_iter
- utf_types
- uuid
- VS Code Dark Modern theme
- vscode-icons
- waker-fn
- weezl
- winnow
- zerocopy
- zmij
- zune
Notices
Slug. Space draws text with the Slug algorithm, from Eric Lengyel, “GPU-Centered Font Rendering Directly from Glyph Outlines”, Journal of Computer Graphics Techniques, vol. 6, no. 2, pp. 31–47, 2017. © 2017 Eric Lengyel, licensed under CC BY-ND 3.0. The home page crops four of the paper’s pages; the whole pages are 31, 34, 37 and 39.
hb-gpu. Space’s shader comes from hb-gpu, part of HarfBuzz, by Behdad Esfahbod. Chord Ink changed it in its fork of the GPUI framework.
Inter. The word “Space” in the “how it works” steps is drawn from the outlines of Inter Display SemiBold 4.1. Inter © The Inter Project Authors (github.com/rsms/inter), SIL Open Font License 1.1: full text.
Math. The formulas in the Markdown demo are laid out by RaTeX (© erweixin, MIT License) and drawn from the outlines of the KaTeX fonts, © 2009–2010 Design Science, Inc. and © 2014–2018 Khan Academy, SIL Open Font License 1.1: full text.
Themes. The editor themes use colors from these projects. Under the LGPL 2.1 or later: Adwaita (by Christian Hergert / GNOME, © 2020 Christian Hergert). Under the MIT License: Ayu (© 2016 Ike Ku), Catppuccin (© 2021 Catppuccin), CutiePro (© 2026 Wuemeli), Dracula (by Ben Hamment, © 2023 Dracula Theme), Everforest (© 2025 Albert Skonieczny, © 2019 sainnhe), GitHub (© 2025 Pyae Sone Aung), Gruvbox (by morhetz), Melange (© 2024 adorabilis), Monosami (© 2024-2026 Samuel Onoja, Fabian Bergström), Night Owl (by Auguste Bercovici, © 2018 Sarah Drasner), Nightfox (by cange, © 2024 Christian Angermann), One (by Atom/GitHub, © 2014 GitHub Inc.), Rosé Pine (by Kainoa Kanter, © Rosé Pine), Tokyo Night (by enkia, © 2024 Austin Saunders), VS Code Dark Modern (by kcamcam, © 2024 Kevin Camellini). Under the Apache License 2.0: JetBrains (by Artem Evsevev, © JetBrains s.r.o.). The Xcode Default and Visual Studio themes use the colors of those apps, by Apple and Microsoft. The MIT License text, with the copyright line of every project under it, is here.
Logos. The logos and icons on this page belong to their owners, who are not connected with Space and do not endorse it, and many are trademarks. Most come from Devicon (MIT License), the rest from Simple Icons (CC0 1.0), vscode-icons (MIT License), Material Icon Theme (MIT License) and file-icons (ISC License) or are the owners’ own files. Every file is a changed copy, simplified for the web. The Bash logo, © 2016 Free Software Foundation, designed by ProspectOne with art director Justin Dorfman for Chet Ramey. Under Free Art License 1.3. The Git logo, by Jason Long. Under CC BY 3.0. The Go gopher, designed by Renée French. Under CC BY 4.0. The HTML5 logo, by W3C. Under CC BY 3.0. The NixOS logo, by the NixOS project. Under CC BY 4.0. The PHP logo, by Colin Viebrock. Under CC BY-SA 4.0. The R logo, by The R Foundation. Under CC BY-SA 4.0. The Ruby logo, by Yukihiro Matsumoto. Under CC BY-SA 2.5. The Solidity logo, by the Solidity team. Under CC BY 4.0. The Zig logo, by the Zig Software Foundation. Under CC BY-SA 4.0. The Helix logo, by jakenvac for the Helix project. Under MPL 2.0. The changed copies of the logos under CC BY-SA, the Free Art License and MPL 2.0 are under those same licenses. The MIT and ISC license texts, with the copyright line of every project under them, are here.
No endorsement. Eric Lengyel, Terathon Software, the HarfBuzz, Inter, KaTeX and RaTeX projects and the authors of the themes are not connected with Space and do not endorse it.