feat(config): port the configuration system and CLI argument parser
Ports ZIG/src/config (minus C/WASM APIs) and cli/{args,CommaSplitter,
diagnostics}.zig into ghostty-config:
- all 202 options with exact names, types, defaults and verbatim docs,
declared through one config_struct! macro; Zig's comptime reflection is
replaced by the ConfigField/CliTarget traits
- loading: default XDG files, -e, config-file includes (optional '?',
cycle detection), themes incl. light:/dark: pairs, conditional config,
replay, finalize() derived defaults, clone/changed diffing for reload
- Linux/GTK default keybinds built on ghostty_input::binding::Set
- formatter producing +show-config output
Verified against the installed Ghostty 1.3.1: `+show-config --default`
and `--default --docs` match byte for byte (except gtk-opengl-debug,
which differs between debug/release builds), as do two complex loaded
configs.
Open items (docs/rewrite/notes/ghostty-config.md): url regex needs an
Oniguruma-compatible engine (onig) in the renderer; some font/terminal
types are local copies awaiting integration; KeyRemapSet equality is
order sensitive unlike Zig.
Test Plan:
- cargo test -p ghostty-config (255 tests)
- compare `ghostty +show-config --default --docs` with our formatter
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//! Path config values (port of `config/path.zig`).
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use crate::cli_args::{ArgError, ConfigField};
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use crate::diagnostics::{Diagnostic, DiagnosticList};
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use crate::formatter::EntryFormatter;
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use std::fmt;
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use std::path::{Component, Path as StdPath, PathBuf};
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/// Path is like a string that represents a path value. The difference is that
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/// when loading the configuration the value for this will be automatically
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/// expanded relative to the path of the config file (or the home directory).
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Path {
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/// No error if the file does not exist.
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Optional(String),
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/// The file is required to exist.
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Required(String),
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}
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impl Default for Path {
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fn default() -> Self {
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Path::Required(String::new())
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}
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}
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/// Lexically resolve `base/path` like `std.fs.path.resolve`.
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fn resolve_lexical(base: &str, path: &str) -> String {
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let joined = PathBuf::from(base).join(path);
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let mut out = PathBuf::new();
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for c in joined.components() {
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match c {
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Component::ParentDir => {
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out.pop();
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}
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Component::CurDir => {}
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other => out.push(other.as_os_str()),
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}
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}
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out.to_string_lossy().into_owned()
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}
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impl Path {
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/// The inner path string.
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#[must_use]
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pub fn path(&self) -> &str {
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match self {
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Path::Optional(p) | Path::Required(p) => p,
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}
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}
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fn path_mut(&mut self) -> &mut String {
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match self {
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Path::Optional(p) | Path::Required(p) => p,
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}
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}
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#[must_use]
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pub fn len(&self) -> usize {
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self.path().len()
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}
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#[must_use]
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pub fn is_empty(&self) -> bool {
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self.path().is_empty()
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}
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/// Parse the input and return a Path. A leading `?` indicates that the path
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/// is _optional_ and an error should not be logged or displayed to the user
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/// if that path does not exist. Otherwise the path is required and an error
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/// should be logged if the path does not exist.
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///
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/// Returns `Ok(None)` for an empty input.
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pub fn parse(input: Option<&str>) -> Result<Option<Path>, ArgError> {
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let mut value = input.ok_or(ArgError::ValueRequired)?;
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if value.is_empty() {
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return Ok(None);
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}
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let optional = if let Some(rest) = value.strip_prefix('?') {
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value = rest;
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true
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} else {
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false
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};
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if value.len() >= 2 && value.starts_with('"') && value.ends_with('"') {
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value = &value[1..value.len() - 1];
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}
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Ok(Some(if optional {
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Path::Optional(value.to_string())
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} else {
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Path::Required(value.to_string())
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}))
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}
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/// Expand relative paths or paths prefixed with `~/`. The path will be
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/// overwritten.
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///
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/// `base` is the base directory to expand relative paths; it must be an
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/// absolute path. Errors are added to `diags` if they occur; an `Err` is
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/// only returned if the base directory cannot be opened.
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pub fn expand(&mut self, base: &str, diags: &mut DiagnosticList) -> std::io::Result<()> {
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assert!(StdPath::new(base).is_absolute());
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let path = self.path().to_string();
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// If it is already absolute we can ignore it.
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if path.is_empty() || StdPath::new(&path).is_absolute() {
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return Ok(());
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}
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// Check if the path starts with a tilde and expand it to the
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// home directory. We explicitly look for "~/" because we don't
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// support alternate users such as "~alice/"
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if path.starts_with("~/") {
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match ghostty_os::expand_home(&path) {
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Ok(expanded) => {
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log::debug!("expanding file path from home directory: path={expanded}");
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*self.path_mut() = expanded;
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}
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Err(err) => {
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diags.append(Diagnostic {
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message: format!("error expanding home directory for path {path}: {err}"),
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..Diagnostic::default()
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});
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// Blank this path so that we don't attempt to resolve it
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// again
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*self = Path::Required(String::new());
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}
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}
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return Ok(());
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}
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// Make sure the base directory can be opened.
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std::fs::read_dir(base)?;
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let full = StdPath::new(base).join(&path);
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let abs = match std::fs::canonicalize(&full) {
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Ok(p) => p.to_string_lossy().into_owned(),
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Err(err) if err.kind() == std::io::ErrorKind::NotFound => {
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// The file doesn't exist. Try to resolve the relative path
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// another way.
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resolve_lexical(base, &path)
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}
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Err(err) => {
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diags.append(Diagnostic {
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message: format!("error resolving file path {path}: {err}"),
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..Diagnostic::default()
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});
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// Blank this path so that we don't attempt to resolve it again
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*self = Path::Required(String::new());
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return Ok(());
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}
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};
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log::debug!("expanding file path relative={path} abs={abs}");
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*self.path_mut() = abs;
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Ok(())
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}
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}
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impl ConfigField for Path {
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/// Parse CLI option. The value will be overwritten.
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fn parse_cli(&mut self, input: Option<&str>) -> Result<(), ArgError> {
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let Some(item) = Path::parse(input)? else {
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return Ok(());
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};
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if item.is_empty() {
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return Ok(());
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}
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*self = item;
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Ok(())
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}
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/// Used by formatter.
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fn format_entry(&self, f: &mut EntryFormatter<'_>) -> fmt::Result {
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match self {
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Path::Optional(p) => writeln!(f.writer, "{} = ?{p}", f.name),
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Path::Required(p) => writeln!(f.writer, "{} = {p}", f.name),
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}
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}
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}
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/// RepeatablePath is like repeatable string but represents a path value. The
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/// difference is that when loading the configuration any values for this will
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/// be automatically expanded relative to the path of the config file (or the home
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/// directory).
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#[derive(Debug, Clone, PartialEq, Eq, Default)]
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pub struct RepeatablePath {
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pub value: Vec<Path>,
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}
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impl RepeatablePath {
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/// Expand all the paths relative to the base directory.
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pub fn expand(&mut self, base: &str, diags: &mut DiagnosticList) -> std::io::Result<()> {
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for path in &mut self.value {
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path.expand(base, diags)?;
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}
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Ok(())
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}
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}
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impl ConfigField for RepeatablePath {
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fn parse_cli(&mut self, input: Option<&str>) -> Result<(), ArgError> {
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let Some(item) = Path::parse(input)? else {
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self.value.clear();
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return Ok(());
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};
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if item.is_empty() {
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// This handles the case of zero length paths after removing any ?
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// prefixes or surrounding quotes. In this case, we don't reset the
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// list.
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return Ok(());
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}
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self.value.push(item);
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Ok(())
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}
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fn format_entry(&self, f: &mut EntryFormatter<'_>) -> fmt::Result {
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if self.value.is_empty() {
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return writeln!(f.writer, "{} = ", f.name);
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}
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for item in &self.value {
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item.format_entry(f)?;
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}
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Ok(())
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}
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}
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#[cfg(test)]
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#[allow(clippy::unwrap_used)]
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mod tests {
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use super::*;
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use crate::formatter::format_entry;
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fn fmt<T: ConfigField>(v: &T) -> String {
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let mut s = String::new();
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format_entry("a", v, &mut s).unwrap();
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s
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}
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#[test]
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fn path_parse() {
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let p = |s| Path::parse(Some(s)).unwrap().unwrap();
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assert_eq!(p("config.1"), Path::Required("config.1".into()));
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assert_eq!(p("?config.2"), Path::Optional("config.2".into()));
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assert_eq!(p("\"?config.3\""), Path::Required("?config.3".into()));
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assert_eq!(p("?\"config.4\""), Path::Optional("config.4".into()));
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assert_eq!(p("?"), Path::Optional(String::new()));
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assert_eq!(p("\"\""), Path::Required(String::new()));
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assert_eq!(p("?\"\""), Path::Optional(String::new()));
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assert_eq!(Path::parse(None), Err(ArgError::ValueRequired));
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assert_eq!(Path::parse(Some("")), Ok(None));
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}
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#[test]
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fn path_parse_cli() {
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let mut item = Path::default();
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item.parse_cli(Some("config.1")).unwrap();
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assert_eq!(item, Path::Required("config.1".into()));
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item.parse_cli(Some("?config.2")).unwrap();
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assert_eq!(item, Path::Optional("config.2".into()));
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item.parse_cli(Some("\"?config.3\"")).unwrap();
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assert_eq!(item, Path::Required("?config.3".into()));
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// Zero-length values, ignored
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item.parse_cli(Some("?")).unwrap();
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assert_eq!(item, Path::Required("?config.3".into()));
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item.parse_cli(Some("\"\"")).unwrap();
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assert_eq!(item, Path::Required("?config.3".into()));
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item.parse_cli(Some("?\"\"")).unwrap();
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assert_eq!(item, Path::Required("?config.3".into()));
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}
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#[test]
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fn path_format_config_single_item() {
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let mut item = Path::default();
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item.parse_cli(Some("A")).unwrap();
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assert_eq!(fmt(&item), "a = A\n");
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}
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#[test]
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fn path_format_config_multiple_items() {
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let mut item = Path::default();
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item.parse_cli(Some("A")).unwrap();
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item.parse_cli(Some("?B")).unwrap();
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assert_eq!(fmt(&item), "a = ?B\n");
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}
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#[test]
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fn repeatable_path_parse_cli() {
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let mut list = RepeatablePath::default();
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list.parse_cli(Some("config.1")).unwrap();
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list.parse_cli(Some("?config.2")).unwrap();
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list.parse_cli(Some("\"?config.3\"")).unwrap();
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assert_eq!(list.value.len(), 3);
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// Zero-length values, ignored
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list.parse_cli(Some("?")).unwrap();
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list.parse_cli(Some("\"\"")).unwrap();
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assert_eq!(list.value.len(), 3);
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assert_eq!(list.value[0], Path::Required("config.1".into()));
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assert_eq!(list.value[1], Path::Optional("config.2".into()));
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assert_eq!(list.value[2], Path::Required("?config.3".into()));
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list.parse_cli(Some("")).unwrap();
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assert_eq!(list.value.len(), 0);
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}
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#[test]
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fn repeatable_path_format_config_empty() {
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assert_eq!(fmt(&RepeatablePath::default()), "a = \n");
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}
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#[test]
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fn repeatable_path_format_config_single_item() {
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let mut list = RepeatablePath::default();
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list.parse_cli(Some("A")).unwrap();
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assert_eq!(fmt(&list), "a = A\n");
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}
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#[test]
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fn repeatable_path_format_config_multiple_items() {
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let mut list = RepeatablePath::default();
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list.parse_cli(Some("A")).unwrap();
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list.parse_cli(Some("?B")).unwrap();
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assert_eq!(fmt(&list), "a = A\na = ?B\n");
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}
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#[test]
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fn path_expand_relative_nonexistent_and_absolute() {
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let mut diags = DiagnosticList::default();
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let mut p = Path::Required("../nope/x.conf".into());
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p.expand("/tmp", &mut diags).unwrap();
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assert_eq!(p, Path::Required("/nope/x.conf".into()));
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let mut p = Path::Optional("/abs/path".into());
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p.expand("/tmp", &mut diags).unwrap();
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assert_eq!(p, Path::Optional("/abs/path".into()));
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assert!(diags.is_empty());
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}
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}
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