envhub-hm 0.2.3

Manage your dotfiles and packages with ease.
Documentation 
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use std::{
    fs,
    process::{Command, Stdio},
};

use anyhow::Error;
use envhub_types::configuration::{self, Configuration};
use indexmap::IndexMap;

use crate::{nix, HOME_MANAGER};

pub fn switch_env(dir: Option<&str>, config: &Configuration, backup: bool) -> Result<(), Error> {
    nix::install()?;
    let home_nix = fs::read_to_string(format!("{}/home.nix", dir.unwrap_or(HOME_MANAGER)))?;
    let mut updated_home_nix = home_nix.clone();
    match &config.package_manager {
        Some(pm) => {
            if pm == "nix" {
                updated_home_nix =
                    add_packages(&home_nix, config.packages.clone().unwrap_or_default())?
            }
        }
        None => {
            updated_home_nix = add_packages(&home_nix, config.packages.clone().unwrap_or_default())?
        }
    };

    match &config.symlink_manager {
        Some(sm) => {
            if sm == "home-manager" {
                updated_home_nix =
                    add_files(&updated_home_nix, config.files.clone().unwrap_or_default())?;
                if config.envs.is_some() {
                    updated_home_nix =
                        add_envs(&updated_home_nix, config.envs.clone().unwrap_or_default())?;
                }
            }
        }
        None => {
            updated_home_nix =
                add_files(&updated_home_nix, config.files.clone().unwrap_or_default())?;
            if config.envs.is_some() {
                updated_home_nix =
                    add_envs(&updated_home_nix, config.envs.clone().unwrap_or_default())?;
            }
        }
    }

    let home_nix_file = format!("{}/home.nix", dir.unwrap_or(HOME_MANAGER));
    fs::write(&home_nix_file, &updated_home_nix)?;

    let cmd = match backup {
        true => format!(
            "nix run home-manager/master -- switch --flake {} -b backup",
            dir.unwrap_or(HOME_MANAGER)
        ),
        false => format!(
            "nix run home-manager/master -- switch --flake {}",
            dir.unwrap_or(HOME_MANAGER)
        ),
    };

    let mut child = Command::new("sh")
        .arg("-c")
        .arg(cmd)
        .stdin(Stdio::inherit())
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .spawn()?;

    child.wait()?;

    Ok(())
}

pub fn add_packages(content: &str, pkgs: Vec<String>) -> Result<String, Error> {
    let mut packages = nix_editor::read::readvalue(content, "home.packages")?;
    let mut entry = String::new();
    for pkg in pkgs {
        let pkg = match pkg.starts_with("pkgs.") {
            true => pkg.to_string(),
            false => format!("pkgs.{}", pkg),
        };
        if packages.contains(&pkg) && !packages.contains(&format!("# {}", pkg)) {
            continue;
        }
        entry.push_str(&format!("\n  {}", pkg));
    }
    entry.push_str("\n]");

    packages = packages.replace("\n]", &entry);

    // replace all \n with \n  to keep the formatting
    packages = packages.replace("\n", "\n  ");

    let output = nix_editor::write::write(content, "home.packages", &packages)?;
    Ok(output)
}

pub fn add_files(
    content: &str,
    files: IndexMap<String, configuration::File>,
) -> Result<String, Error> {
    let mut entry = String::new();

    if files.is_empty() {
        return Ok(content.into());
    }

    entry.push_str("{\n");
    for (file, config) in files {
        if config.source.is_some() {
            let source = config.source.unwrap();
            let source = match source.starts_with("dotfiles/") {
                true => source.to_string(),
                false => format!("dotfiles/{}", source),
            };
            entry.push_str(&format!("  \"{}\".source = {};\n", file, source));
            continue;
        }
        if config.content.is_some() {
            entry.push_str(&format!(
                "  \"{}\".text = ''\n{}\n'';\n",
                file,
                config.content.unwrap()
            ));
        }
    }
    entry.push_str("}\n");
    let result = nix_editor::write::write(content, "home.file", &entry)?;
    Ok(result)
}

pub fn add_envs(content: &str, envs: IndexMap<String, String>) -> Result<String, Error> {
    let mut entry = String::new();

    if envs.is_empty() {
        return Ok(content.into());
    }

    entry.push_str("{\n");
    for (env, value) in envs {
        entry.push_str(&format!("  \"{}\" = \"{}\";\n", env, value));
    }
    entry.push_str("}\n");
    let result = nix_editor::write::write(content, "home.sessionVariables", &entry)?;
    Ok(result)
}