squigit-storage 0.1.0

Persistent profiles, threads, and content-addressed storage for Squigit
Documentation 
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// Copyright 2026 a7mddra
// SPDX-License-Identifier: Apache-2.0

use std::path::PathBuf;

const CONFIG_DIR_ENV: &str = "SQUIGIT_CONFIG_DIR";

#[cfg(target_os = "linux")]
const APP_DIR_NAME: &str = "squigit";

#[cfg(not(target_os = "linux"))]
const APP_DIR_NAME: &str = "Squigit";

/// Resolve Squigit's application config root.
///
/// `SQUIGIT_CONFIG_DIR` overrides the OS default with an exact application root. This is used by
/// isolated tooling that must not read or write the installed application's profile data.
pub fn base_config_dir() -> Option<PathBuf> {
    resolve_base_config_dir(
        std::env::var_os(CONFIG_DIR_ENV).map(PathBuf::from),
        dirs::config_dir(),
    )
}

fn resolve_base_config_dir(
    override_dir: Option<PathBuf>,
    system_config_dir: Option<PathBuf>,
) -> Option<PathBuf> {
    override_dir
        .filter(|path| !path.as_os_str().is_empty())
        .or_else(|| system_config_dir.map(|path| path.join(APP_DIR_NAME)))
}