use std::env;
use std::fs;
use std::path::Path;
use std::path::PathBuf;
#[derive(Clone, Debug)]
pub(crate) struct Config {
pub(crate) profiles: Vec<Profile>,
}
#[derive(Clone, Debug)]
pub(crate) struct Profile {
pub(crate) name: String,
pub(crate) user_data_dir: String,
}
#[derive(Default)]
pub(crate) struct ProfileBuilder {
name: Option<String>,
user_data_dir: Option<String>,
}
pub(crate) const CONFIG_RELATIVE_PATH: &str = ".config/chrome-devtools/config.toml";
pub(crate) const CACHE_RELATIVE_PATH: &str = ".cache/chrome-devtools";
pub(crate) const DEFAULT_PROFILE_NAME: &str = "default";
pub(crate) const DEFAULT_PROFILE_USER_DATA_DIR: &str = "~/.config/chrome-devtools/profiles/default";
pub(crate) const PROFILE_USER_DATA_DIR_PREFIX: &str = "~/.config/chrome-devtools/profiles";
pub(crate) fn load_or_create_config() -> Result<Config, String> {
let path = config_path()?;
if !path.exists() {
create_default_config(&path)?;
}
let content = fs::read_to_string(&path)
.map_err(|error| format!("failed to read {}: {error}", path.display()))?;
parse_config(&content).map_err(|error| format!("failed to parse {}: {error}", path.display()))
}
pub(crate) fn create_default_config(path: &Path) -> Result<(), String> {
let Some(parent) = path.parent() else {
return Err(format!("config path has no parent: {}", path.display()));
};
fs::create_dir_all(parent)
.map_err(|error| format!("failed to create {}: {error}", parent.display()))?;
fs::create_dir_all(expand_home(DEFAULT_PROFILE_USER_DATA_DIR)?)
.map_err(|error| format!("failed to create default profile user data dir: {error}"))?;
fs::write(path, default_config_content())
.map_err(|error| format!("failed to write {}: {error}", path.display()))
}
pub(crate) fn default_config_content() -> String {
format!("[[profiles]]\nname = \"{DEFAULT_PROFILE_NAME}\"\n")
}
pub(crate) fn parse_config(content: &str) -> Result<Config, String> {
let mut profiles = Vec::new();
let mut current: Option<ProfileBuilder> = None;
for (line_number, raw_line) in content.lines().enumerate() {
let line_number = line_number + 1;
let line = raw_line.trim();
if line.is_empty() || line.starts_with('#') {
continue;
}
if line == "[[profiles]]" {
push_profile(&mut profiles, current.take(), line_number)?;
current = Some(ProfileBuilder::default());
continue;
}
let Some((key, value)) = line.split_once('=') else {
return Err(format!("line {line_number}: expected key = value"));
};
let Some(profile) = current.as_mut() else {
return Err(format!(
"line {line_number}: profile fields must be inside [[profiles]]"
));
};
let key = key.trim();
let value = value.trim();
match key {
"name" => profile.name = Some(parse_toml_string(value, line_number)?),
"port" => {
eprintln!(
"warning: line {line_number}: 'port' is deprecated and ignored; the daemon now picks a free port automatically"
);
}
"user_data_dir" => profile.user_data_dir = Some(parse_toml_string(value, line_number)?),
unknown => {
return Err(format!(
"line {line_number}: unknown profile key: {unknown}"
))
}
}
}
push_profile(&mut profiles, current.take(), content.lines().count() + 1)?;
if profiles.is_empty() {
return Err("config must define at least one [[profiles]] entry".to_string());
}
Ok(Config { profiles })
}
pub(crate) fn push_profile(
profiles: &mut Vec<Profile>,
builder: Option<ProfileBuilder>,
line_number: usize,
) -> Result<(), String> {
let Some(builder) = builder else {
return Ok(());
};
let name = builder
.name
.ok_or_else(|| format!("line {line_number}: profile is missing name"))?;
let user_data_dir = builder
.user_data_dir
.unwrap_or_else(|| default_user_data_dir_for_profile(&name));
if profiles.iter().any(|profile| profile.name == name) {
return Err(format!("duplicate profile name: {name}"));
}
profiles.push(Profile {
name,
user_data_dir,
});
Ok(())
}
pub(crate) fn default_user_data_dir_for_profile(name: &str) -> String {
format!("{PROFILE_USER_DATA_DIR_PREFIX}/{name}")
}
pub(crate) fn parse_toml_string(value: &str, line_number: usize) -> Result<String, String> {
let Some(inner) = value
.strip_prefix('"')
.and_then(|value| value.strip_suffix('"'))
else {
return Err(format!("line {line_number}: expected quoted string"));
};
let mut parsed = String::new();
let mut chars = inner.chars();
while let Some(character) = chars.next() {
if character != '\\' {
parsed.push(character);
continue;
}
let Some(escaped) = chars.next() else {
return Err(format!("line {line_number}: dangling escape in string"));
};
match escaped {
'\\' => parsed.push('\\'),
'"' => parsed.push('"'),
'n' => parsed.push('\n'),
'r' => parsed.push('\r'),
't' => parsed.push('\t'),
other => return Err(format!("line {line_number}: unsupported escape: \\{other}")),
}
}
Ok(parsed)
}
pub(crate) fn config_path() -> Result<PathBuf, String> {
let Some(home) = env::var_os("HOME") else {
return Err("HOME is not set".to_string());
};
Ok(PathBuf::from(home).join(CONFIG_RELATIVE_PATH))
}
pub(crate) fn cache_dir() -> Result<PathBuf, String> {
let Some(home) = env::var_os("HOME") else {
return Err("HOME is not set".to_string());
};
Ok(PathBuf::from(home).join(CACHE_RELATIVE_PATH))
}
pub(crate) fn find_profile(config: &Config, name: &str) -> Result<Profile, String> {
config
.profiles
.iter()
.find(|profile| profile.name == name)
.cloned()
.ok_or_else(|| {
let available = config
.profiles
.iter()
.map(|profile| profile.name.as_str())
.collect::<Vec<_>>()
.join(", ");
format!(
"unknown profile: {name}; available: {available} (defined in ~/{CONFIG_RELATIVE_PATH})"
)
})
}
pub(crate) fn expand_home(path: &str) -> Result<PathBuf, String> {
if path == "~" {
return env::var_os("HOME")
.map(PathBuf::from)
.ok_or_else(|| "HOME is not set".to_string());
}
if let Some(rest) = path.strip_prefix("~/") {
let Some(home) = env::var_os("HOME") else {
return Err("HOME is not set".to_string());
};
return Ok(PathBuf::from(home).join(rest));
}
Ok(PathBuf::from(path))
}