jj/src/main.rs

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::env;
use std::path::PathBuf;

use jujutsu::commands::dispatch;
use jujutsu::ui::Ui;
use jujutsu_lib::settings::UserSettings;

fn config_path() -> Option<PathBuf> {
    if let Ok(config_path) = env::var("JJ_CONFIG") {
        Some(PathBuf::from(config_path))
    } else {
        dirs::config_dir().map(|config_dir| config_dir.join("jj").join("config.toml"))
    }
}

fn read_config() -> Result<UserSettings, config::ConfigError> {
    let mut config_builder = config::Config::builder();

    if let Some(config_path) = config_path() {
        config_builder = config_builder.add_source(
            config::File::from(config_path)
                .required(false)
                .format(config::FileFormat::Toml),
        );
    };

    // TODO: Make the config from environment a separate source instead? Seems
    // cleaner to separate it like that, especially if the config::Config instance
    // can keep track of where the config comes from then (it doesn't seem like it
    // can, however - we don't give a name or anything to the Config object).
    if let Ok(value) = env::var("JJ_USER") {
        config_builder = config_builder.set_override("user.name", value)?;
    }
    if let Ok(value) = env::var("JJ_EMAIL") {
        config_builder = config_builder.set_override("user.email", value)?;
    }
    if let Ok(value) = env::var("JJ_TIMESTAMP") {
        config_builder = config_builder.set_override("user.timestamp", value)?;
    }

    let config = config_builder.build()?;
    Ok(UserSettings::from_config(config))
}

fn main() {
    // TODO: We need to do some argument parsing here, at least for things like
    // --config,       and for reading user configs from the repo pointed to by
    // -R.
    match read_config() {
        Ok(user_settings) => {
            let ui = Ui::for_terminal(user_settings);
            let status = dispatch(ui, &mut std::env::args_os());
            std::process::exit(status);
        }
        Err(err) => {
            let mut ui = Ui::for_terminal(UserSettings::default());
            ui.write_error(&format!("Invalid config: {}\n", err))
                .unwrap();
            std::process::exit(1);
        }
    }
}