ivm 0.6.0

The cross-platform Inko version manager
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use crate::error::Error;
use std::env;
use std::path::PathBuf;

pub const INKO_EXE: &str = "inko";
pub const INKO_LIB: &str = "libinko.a";

const BASE_DIR: &str = "ivm";

fn home_dir() -> Option<PathBuf> {
    let var = env::var_os("HOME");

    var.filter(|v| !v.is_empty()).map(PathBuf::from)
}

pub fn cache_directory() -> Result<PathBuf, Error> {
    let base = if cfg!(target_os = "macos") {
        home_dir().map(|h| h.join("Library").join("Caches"))
    } else {
        env::var_os("XDG_CACHE_HOME")
            .filter(|v| !v.is_empty())
            .map(PathBuf::from)
            .or_else(|| home_dir().map(|h| h.join(".cache")))
    };

    base.map(|d| d.join(BASE_DIR)).ok_or_else(|| {
        Error::generic("The cache directory couldn't be determined")
    })
}

fn base_data_directory() -> Result<PathBuf, Error> {
    let base = if cfg!(target_os = "macos") {
        home_dir().map(|h| h.join("Library").join("Application Support"))
    } else {
        env::var_os("XDG_DATA_HOME")
            .filter(|v| !v.is_empty())
            .map(PathBuf::from)
            .or_else(|| home_dir().map(|h| h.join(".local").join("share")))
    };

    base.ok_or_else(|| {
        Error::generic("The local data directory couldn't be determined")
    })
}

pub fn data_directory() -> Result<PathBuf, Error> {
    base_data_directory().map(|d| d.join(BASE_DIR))
}

pub fn inko_data_directory() -> Result<PathBuf, Error> {
    base_data_directory().map(|d| d.join("inko"))
}

pub fn install_directory() -> Result<PathBuf, Error> {
    data_directory().map(|d| d.join("installed"))
}

pub fn config_directory() -> Result<PathBuf, Error> {
    let base = if cfg!(target_os = "macos") {
        home_dir().map(|h| h.join("Library").join("Application Support"))
    } else {
        env::var_os("XDG_DATA_HOME")
            .filter(|v| !v.is_empty())
            .map(PathBuf::from)
            .or_else(|| home_dir().map(|h| h.join(".config")))
    };

    base.map(|d| d.join(BASE_DIR)).ok_or_else(|| {
        Error::generic("The configuration directory couldn't be determined")
    })
}

pub fn bin_directory() -> Result<PathBuf, Error> {
    data_directory().map(|d| d.join("bin"))
}

pub fn downloads_directory() -> Result<PathBuf, Error> {
    cache_directory().map(|d| d.join("downloads"))
}

pub fn default_version_file() -> Result<PathBuf, Error> {
    config_directory().map(|d| d.join("version"))
}

pub fn manifest_file() -> Result<PathBuf, Error> {
    downloads_directory().map(|d| d.join("manifest.txt"))
}