concord 2.5.20

A terminal user interface client for Discord
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use std::{env, ffi::OsString, path::PathBuf};

const APP_DIR: &str = "concord";
const CONFIG_FILE: &str = "config.toml";
const KEYMAP_FILE: &str = "keymap.toml";
const THEME_FILE: &str = "theme.toml";
const CREDENTIAL_FILE: &str = "credentials.toml";
const DISCORD_BROWSER_FILE: &str = "discord-browser.toml";
const DISCORD_COOKIE_FILE: &str = "discord-cookies.json";
const LOG_FILE: &str = "concord.log";
const STATE_FILE: &str = "state.toml";

/// Root directory for user-managed config files.
pub fn app_dir() -> Option<PathBuf> {
    Some(config_base_dir()?.join(APP_DIR))
}

/// Root directory for local machine state that should not be checked into dotfiles.
pub fn state_dir() -> Option<PathBuf> {
    Some(state_base_dir()?.join(APP_DIR))
}

pub fn config_file() -> Option<PathBuf> {
    Some(app_dir()?.join(CONFIG_FILE))
}

pub fn keymap_file() -> Option<PathBuf> {
    Some(app_dir()?.join(KEYMAP_FILE))
}

pub fn theme_file() -> Option<PathBuf> {
    Some(app_dir()?.join(THEME_FILE))
}

pub fn credential_file() -> Option<PathBuf> {
    Some(state_dir()?.join(CREDENTIAL_FILE))
}

pub(crate) fn discord_browser_file() -> Option<PathBuf> {
    Some(state_dir()?.join(DISCORD_BROWSER_FILE))
}

pub(crate) fn discord_cookie_file() -> Option<PathBuf> {
    Some(state_dir()?.join(DISCORD_COOKIE_FILE))
}

pub fn state_file() -> Option<PathBuf> {
    Some(state_dir()?.join(STATE_FILE))
}

pub fn log_file() -> Option<PathBuf> {
    Some(app_dir()?.join(LOG_FILE))
}

pub fn download_dir() -> Option<PathBuf> {
    dirs::download_dir().or_else(|| Some(dirs::home_dir()?.join("Downloads")))
}

fn config_base_dir() -> Option<PathBuf> {
    absolute_env_path(env::var_os("XDG_CONFIG_HOME")).or_else(dirs::config_dir)
}

fn state_base_dir() -> Option<PathBuf> {
    absolute_env_path(env::var_os("XDG_STATE_HOME"))
        .or_else(|| Some(dirs::home_dir()?.join(".local").join("state")))
}

fn absolute_env_path(value: Option<OsString>) -> Option<PathBuf> {
    value.map(PathBuf::from).filter(|path| path.is_absolute())
}

#[cfg(test)]
mod tests {
    use super::absolute_env_path;

    #[test]
    fn absolute_env_path_accepts_only_absolute_paths() {
        let path = std::env::temp_dir().join("concord-xdg-config-home");

        for (value, expected) in [
            (Some(path.clone().into()), Some(path)),
            (Some("relative/path".into()), None),
            (None, None),
        ] {
            assert_eq!(absolute_env_path(value), expected);
        }
    }
}