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use portable_pty::CommandBuilder;
pub fn build_command(cwd: Option<String>) -> Result<CommandBuilder, String> {
#[cfg(unix)]
{
unix::build(cwd)
}
#[cfg(windows)]
{
windows::build(cwd)
}
}
fn ensure_utf8_locale(cmd: &mut CommandBuilder) {
let is_utf8 = |v: &str| {
let up = v.to_ascii_uppercase();
up.contains("UTF-8") || up.contains("UTF8")
};
let already_utf8 = ["LC_ALL", "LC_CTYPE", "LANG"]
.iter()
.any(|k| std::env::var(k).ok().as_deref().is_some_and(is_utf8));
if already_utf8 {
return;
}
#[cfg(target_os = "macos")]
let fallback = "en_US.UTF-8";
#[cfg(all(unix, not(target_os = "macos")))]
let fallback = "C.UTF-8";
#[cfg(windows)]
let fallback = "en_US.UTF-8";
cmd.env("LANG", fallback);
}
fn apply_common(cmd: &mut CommandBuilder, cwd: Option<String>) {
cmd.env("TERM", "xterm-256color");
cmd.env("COLORTERM", "truecolor");
cmd.env("TERAX_TERMINAL", "1");
ensure_utf8_locale(cmd);
let resolved_cwd = cwd
.map(PathBuf::from)
.filter(|p| p.is_dir())
.or_else(|| dirs::home_dir().filter(|p| p.is_dir()))
.or_else(|| std::env::current_dir().ok());
if let Some(cwd) = resolved_cwd {
#[cfg(windows)]
let cwd = PathBuf::from(cwd.to_string_lossy().replace('/', "\\"));
log::info!("pty cwd: {}", cwd.display());
cmd.cwd(cwd);
} else {
log::warn!("pty cwd: no usable directory, inheriting from process");
}
}
#[cfg(unix)]
mod unix {
use std::ffi::OsString;
use std::fs;
use std::path::{Path, PathBuf};
use portable_pty::CommandBuilder;
const ZSHENV: &str = include_str!("scripts/zshenv.zsh");
const ZPROFILE: &str = include_str!("scripts/zprofile.zsh");
const ZLOGIN: &str = include_str!("scripts/zlogin.zsh");
const ZSHRC: &str = include_str!("scripts/zshrc.zsh");
const BASHRC: &str = include_str!("scripts/bashrc.bash");
const FISH_INIT: &str = include_str!("scripts/init.fish");
pub enum Shell {
Zsh,
Bash,
Fish,
Other,
}
impl Shell {
pub fn detect() -> (Shell, String) {
let path = std::env::var("SHELL").unwrap_or_else(|_| "/bin/zsh".into());
let name = path.rsplit('/').next().unwrap_or("").to_string();
let shell = match name.as_str() {
"zsh" => Shell::Zsh,
"bash" => Shell::Bash,
"fish" => Shell::Fish,
_ => Shell::Other,
};
(shell, path)
}
}
pub fn build(cwd: Option<String>) -> Result<CommandBuilder, String> {
let (shell, shell_path) = Shell::detect();
let mut cmd = CommandBuilder::new(&shell_path);
super::apply_common(&mut cmd, cwd);
match shell {
Shell::Zsh => {
match prepare_zdotdir() {
Ok(zdotdir) => {
if let Ok(user_zd) = std::env::var("ZDOTDIR") {
cmd.env("TERAX_USER_ZDOTDIR", user_zd);
}
cmd.env("ZDOTDIR", zdotdir);
}
Err(e) => {
log::warn!("zsh shell integration disabled: {e}");
}
}
// Login shell so /etc/zprofile runs path_helper on macOS — without
// this, GUI-launched apps get a minimal PATH missing Homebrew.
cmd.arg("-l");
}
Shell::Bash => {
match prepare_bash_rcfile() {
Ok(rc) => {
cmd.arg("--rcfile");
cmd.arg(rc);
}
Err(e) => {
log::warn!("bash shell integration disabled: {e}");
}
}
// bash ignores --rcfile under -l, so we use -i and source
// /etc/profile from inside our rcfile to emulate login init.
cmd.arg("-i");
}
Shell::Fish => {
match prepare_fish_init() {
Ok(init) => {
cmd.arg("--init-command");
cmd.arg(format!("source {}", shell_quote(&init)));
}
Err(e) => {
log::warn!("fish shell integration disabled: {e}");
}
}
cmd.arg("-i");
}
Shell::Other => {
log::info!(
"unsupported shell '{}', spawning without integration",
shell_path
);
}
}
Ok(cmd)
}
fn shell_quote(p: &Path) -> String {
let s = p.to_string_lossy();
format!("'{}'", s.replace('\'', "'\\''"))
}
fn integration_root() -> Result<PathBuf, String> {
let home = dirs::home_dir().ok_or_else(|| "could not resolve home dir".to_string())?;
let root = home.join(".cache").join("terax").join("shell-integration");
fs::create_dir_all(&root).map_err(|e| format!("create {}: {e}", root.display()))?;
Ok(root)
}
fn prepare_zdotdir() -> Result<PathBuf, String> {
let dir = integration_root()?.join("zsh");
fs::create_dir_all(&dir).map_err(|e| format!("create {}: {e}", dir.display()))?;
write_if_changed(&dir.join(".zshenv"), ZSHENV)?;
write_if_changed(&dir.join(".zprofile"), ZPROFILE)?;
write_if_changed(&dir.join(".zshrc"), ZSHRC)?;
write_if_changed(&dir.join(".zlogin"), ZLOGIN)?;
Ok(dir)
}
fn prepare_bash_rcfile() -> Result<PathBuf, String> {
let dir = integration_root()?.join("bash");
fs::create_dir_all(&dir).map_err(|e| format!("create {}: {e}", dir.display()))?;
let rc = dir.join("bashrc");
write_if_changed(&rc, BASHRC)?;
Ok(rc)
}
fn prepare_fish_init() -> Result<PathBuf, String> {
let dir = integration_root()?.join("fish");
fs::create_dir_all(&dir).map_err(|e| format!("create {}: {e}", dir.display()))?;
let init = dir.join("init.fish");
write_if_changed(&init, FISH_INIT)?;
Ok(init)
}
fn write_if_changed(path: &Path, content: &str) -> Result<(), String> {
if let Ok(existing) = fs::read_to_string(path) {
if existing == content {
return Ok(());
}
}
// Atomic replace: a parallel shell startup must never source a half-written file.
let mut tmp: OsString = path.as_os_str().to_owned();
tmp.push(".__terax_tmp__");
let tmp = PathBuf::from(tmp);
fs::write(&tmp, content).map_err(|e| format!("write {}: {e}", tmp.display()))?;
fs::rename(&tmp, path).map_err(|e| {
let _ = fs::remove_file(&tmp);
format!("rename {} -> {}: {e}", tmp.display(), path.display())
})
}
}
#[cfg(windows)]
mod windows {
use std::ffi::OsString;
use std::fs;
use std::path::{Path, PathBuf};
use portable_pty::CommandBuilder;
const PROFILE_PS1: &str = include_str!("scripts/profile.ps1");
pub fn build(cwd: Option<String>) -> Result<CommandBuilder, String> {
let shell_path = super::windows_shell_path();
let shell_name = shell_path
.file_name()
.and_then(|s| s.to_str())
.map(|s| s.to_ascii_lowercase())
.unwrap_or_default();
let is_powershell = shell_name == "pwsh.exe" || shell_name == "powershell.exe";
let mut cmd = CommandBuilder::new(&shell_path);
super::apply_common(&mut cmd, cwd);
if is_powershell {
match prepare_ps_profile() {
Ok(profile) => {
cmd.arg("-NoLogo");
cmd.arg("-NoExit");
cmd.arg("-ExecutionPolicy");
cmd.arg("Bypass");
cmd.arg("-File");
cmd.arg(profile);
}
Err(e) => {
log::warn!("powershell shell integration disabled: {e}");
}
}
} else {
log::info!("spawning {} without shell integration", shell_name);
}
log::info!("spawning Windows shell: {}", shell_path.display());
Ok(cmd)
}
fn integration_root() -> Result<PathBuf, String> {
let home = dirs::home_dir().ok_or_else(|| "could not resolve home dir".to_string())?;
let root = home.join(".cache").join("terax").join("shell-integration");
fs::create_dir_all(&root).map_err(|e| format!("create {}: {e}", root.display()))?;
Ok(root)
}
fn prepare_ps_profile() -> Result<PathBuf, String> {
let dir = integration_root()?.join("powershell");
fs::create_dir_all(&dir).map_err(|e| format!("create {}: {e}", dir.display()))?;
let file = dir.join("profile.ps1");
write_if_changed(&file, PROFILE_PS1)?;
Ok(file)
}
fn write_if_changed(path: &Path, content: &str) -> Result<(), String> {
if let Ok(existing) = fs::read_to_string(path) {
if existing == content {
return Ok(());
}
}
let mut tmp: OsString = path.as_os_str().to_owned();
tmp.push(".__terax_tmp__");
let tmp = PathBuf::from(tmp);
fs::write(&tmp, content).map_err(|e| format!("write {}: {e}", tmp.display()))?;
fs::rename(&tmp, path).map_err(|e| {
let _ = fs::remove_file(&tmp);
format!("rename {} -> {}: {e}", tmp.display(), path.display())
})
}
}
#[cfg(windows)]
pub fn windows_shell_path() -> PathBuf {
if let Some(p) = which_in_path("pwsh.exe") {
return p;
}
if let Some(pf) = std::env::var_os("ProgramFiles").map(PathBuf::from) {
let candidate = pf.join("PowerShell").join("7").join("pwsh.exe");
if candidate.is_file() {
return candidate;
}
}
let system32 = std::env::var_os("SystemRoot")
.map(PathBuf::from)
.unwrap_or_else(|| PathBuf::from(r"C:\Windows"))
.join("System32");
let ps5 = system32
.join("WindowsPowerShell")
.join("v1.0")
.join("powershell.exe");
if ps5.is_file() {
return ps5;
}
system32.join("cmd.exe")
}
#[cfg(windows)]
fn which_in_path(name: &str) -> Option<PathBuf> {
let path = std::env::var_os("PATH")?;
for dir in std::env::split_paths(&path) {
let candidate = dir.join(name);
if candidate.is_file() {
return Some(candidate);
}
}
None
}
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