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starship/src/context.rs

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use crate::config::{ModuleConfig, StarshipConfig};
use crate::configs::StarshipRootConfig;
use crate::module::Module;
use crate::utils::{create_command, exec_timeout, read_file, CommandOutput};
use crate::modules;
use crate::utils::{self, home_dir};
use clap::Parser;
use git2::{ErrorCode::UnbornBranch, Repository, RepositoryState};
use once_cell::sync::OnceCell;
#[cfg(test)]
use std::collections::HashMap;
use std::collections::HashSet;
use std::env;
use std::ffi::{OsStr, OsString};
use std::fmt::Debug;
use std::fs;
use std::marker::PhantomData;
use std::num::ParseIntError;
use std::path::{Path, PathBuf};
use std::str::FromStr;
use std::string::String;
use std::time::{Duration, Instant};
use terminal_size::terminal_size;
/// Context contains data or common methods that may be used by multiple modules.
/// The data contained within Context will be relevant to this particular rendering
/// of the prompt.
pub struct Context<'a> {
/// The deserialized configuration map from the user's `starship.toml` file.
pub config: StarshipConfig,
/// The current working directory that starship is being called in.
pub current_dir: PathBuf,
/// A logical directory path which should represent the same directory as current_dir,
/// though may appear different.
/// E.g. when navigating to a PSDrive in PowerShell, or a path without symlinks resolved.
pub logical_dir: PathBuf,
/// A struct containing directory contents in a lookup-optimized format.
dir_contents: OnceCell<DirContents>,
/// Properties to provide to modules.
pub properties: Properties,
/// Private field to store Git information for modules who need it
repo: OnceCell<Repo>,
/// The shell the user is assumed to be running
pub shell: Shell,
/// Which prompt to print (main, right, ...)
pub target: Target,
/// Width of terminal, or zero if width cannot be detected.
pub width: usize,
/// A HashMap of environment variable mocks
#[cfg(test)]
pub env: HashMap<&'a str, String>,
/// A HashMap of command mocks
#[cfg(test)]
pub cmd: HashMap<&'a str, Option<CommandOutput>>,
/// a mock of the root directory
#[cfg(test)]
pub root_dir: tempfile::TempDir,
#[cfg(feature = "battery")]
pub battery_info_provider: &'a (dyn crate::modules::BatteryInfoProvider + Send + Sync),
/// Starship root config
pub root_config: StarshipRootConfig,
/// Avoid issues with unused lifetimes when features are disabled
_marker: PhantomData<&'a ()>,
}
impl<'a> Context<'a> {
/// Identify the current working directory and create an instance of Context
/// for it. "logical-path" is used when a shell allows the "current working directory"
/// to be something other than a file system path (like powershell provider specific paths).
pub fn new(arguments: Properties, target: Target) -> Context<'a> {
let shell = Context::get_shell();
// Retrieve the "current directory".
// If the path argument is not set fall back to the OS current directory.
let path = arguments
.path
.clone()
.or_else(|| env::current_dir().ok())
.or_else(|| env::var("PWD").map(PathBuf::from).ok())
.or_else(|| arguments.logical_path.clone())
.unwrap_or_default();
// Retrieve the "logical directory".
// If the path argument is not set fall back to the PWD env variable set by many shells
// or to the other path.
let logical_path = arguments
.logical_path
.clone()
.or_else(|| env::var("PWD").map(PathBuf::from).ok())
.unwrap_or_else(|| path.clone());
Context::new_with_shell_and_path(arguments, shell, target, path, logical_path)
}
/// Create a new instance of Context for the provided directory
pub fn new_with_shell_and_path(
mut properties: Properties,
shell: Shell,
target: Target,
path: PathBuf,
logical_path: PathBuf,
) -> Context<'a> {
let config = StarshipConfig::initialize();
// If the vector is zero-length, we should pretend that we didn't get a
// pipestatus at all (since this is the input `--pipestatus=""`)
if properties
.pipestatus
.as_deref()
.map_or(false, |p| p.len() == 1 && p[0].is_empty())
{
properties.pipestatus = None;
}
log::trace!(
"Received completed pipestatus of {:?}",
properties.pipestatus
);
// If status-code is empty, set it to None
if matches!(properties.status_code.as_deref(), Some("")) {
properties.status_code = None;
}
// Canonicalize the current path to resolve symlinks, etc.
// NOTE: On Windows this may convert the path to extended-path syntax.
let current_dir = Context::expand_tilde(path);
let current_dir = dunce::canonicalize(&current_dir).unwrap_or(current_dir);
let logical_dir = logical_path;
let root_config = config
.config
.as_ref()
.map_or_else(StarshipRootConfig::default, StarshipRootConfig::load);
let width = properties.terminal_width;
Context {
config,
properties,
current_dir,
logical_dir,
dir_contents: OnceCell::new(),
repo: OnceCell::new(),
shell,
target,
width,
#[cfg(test)]
root_dir: tempfile::TempDir::new().unwrap(),
#[cfg(test)]
env: HashMap::new(),
#[cfg(test)]
cmd: HashMap::new(),
#[cfg(feature = "battery")]
battery_info_provider: &crate::modules::BatteryInfoProviderImpl,
root_config,
_marker: PhantomData,
}
}
// Tries to retrieve home directory from a table in testing mode or else retrieves it from the os
pub fn get_home(&self) -> Option<PathBuf> {
if cfg!(test) {
return self.get_env("HOME").map(PathBuf::from).or_else(home_dir);
}
home_dir()
}
// Retrieves a environment variable from the os or from a table if in testing mode
#[cfg(test)]
pub fn get_env<K: AsRef<str>>(&self, key: K) -> Option<String> {
self.env
.get(key.as_ref())
.map(std::string::ToString::to_string)
}
#[cfg(not(test))]
#[inline]
pub fn get_env<K: AsRef<str>>(&self, key: K) -> Option<String> {
env::var(key.as_ref()).ok()
}
// Retrieves a environment variable from the os or from a table if in testing mode (os version)
#[cfg(test)]
pub fn get_env_os<K: AsRef<str>>(&self, key: K) -> Option<OsString> {
self.env.get(key.as_ref()).map(OsString::from)
}
#[cfg(not(test))]
#[inline]
pub fn get_env_os<K: AsRef<str>>(&self, key: K) -> Option<OsString> {
env::var_os(key.as_ref())
}
/// Convert a `~` in a path to the home directory
pub fn expand_tilde(dir: PathBuf) -> PathBuf {
if dir.starts_with("~") {
let without_home = dir.strip_prefix("~").unwrap();
return utils::home_dir().unwrap().join(without_home);
}
dir
}
/// Create a new module
pub fn new_module(&self, name: &str) -> Module {
let config = self.config.get_module_config(name);
let desc = modules::description(name);
Module::new(name, desc, config)
}
/// Check if `disabled` option of the module is true in configuration file.
pub fn is_module_disabled_in_config(&self, name: &str) -> bool {
let config = self.config.get_module_config(name);
// If the segment has "disabled" set to "true", don't show it
let disabled = config.and_then(|table| table.as_table()?.get("disabled")?.as_bool());
disabled == Some(true)
}
/// Return whether the specified custom module has a `disabled` option set to true.
/// If it doesn't exist, `None` is returned.
pub fn is_custom_module_disabled_in_config(&self, name: &str) -> Option<bool> {
let config = self.config.get_custom_module_config(name)?;
let disabled = Some(config).and_then(|table| table.as_table()?.get("disabled")?.as_bool());
Some(disabled == Some(true))
}
// returns a new ScanDir struct with reference to current dir_files of context
// see ScanDir for methods
pub fn try_begin_scan(&'a self) -> Option<ScanDir<'a>> {
Some(ScanDir {
dir_contents: self.dir_contents().ok()?,
files: &[],
folders: &[],
extensions: &[],
})
}
/// Will lazily get repo root and branch when a module requests it.
pub fn get_repo(&self) -> Result<&Repo, git2::Error> {
self.repo.get_or_try_init(|| -> Result<Repo, git2::Error> {
let repository = if env::var("GIT_DIR").is_ok() {
Repository::open_from_env()
} else {
let dirs: [PathBuf; 0] = [];
Repository::open_ext(&self.current_dir, git2::RepositoryOpenFlags::FROM_ENV, dirs)
}?;
Ok(Repo {
branch: get_current_branch(&repository),
workdir: repository.workdir().map(Path::to_path_buf),
path: Path::to_path_buf(repository.path()),
state: repository.state(),
remote: get_remote_repository_info(&repository),
})
})
}
pub fn dir_contents(&self) -> Result<&DirContents, std::io::Error> {
self.dir_contents.get_or_try_init(|| {
let timeout = self.root_config.scan_timeout;
DirContents::from_path_with_timeout(&self.current_dir, Duration::from_millis(timeout))
})
}
fn get_shell() -> Shell {
let shell = env::var("STARSHIP_SHELL").unwrap_or_default();
match shell.as_str() {
"bash" => Shell::Bash,
"fish" => Shell::Fish,
"ion" => Shell::Ion,
"powershell" | "pwsh" => Shell::PowerShell,
"zsh" => Shell::Zsh,
"elvish" => Shell::Elvish,
"tcsh" => Shell::Tcsh,
"nu" => Shell::Nu,
"xonsh" => Shell::Xonsh,
"cmd" => Shell::Cmd,
_ => Shell::Unknown,
}
}
// TODO: This should be used directly by clap parse
pub fn get_cmd_duration(&self) -> Option<u128> {
self.properties
.cmd_duration
.as_deref()
.and_then(|cd| cd.parse::<u128>().ok())
}
/// Execute a command and return the output on stdout and stderr if successful
#[inline]
pub fn exec_cmd<T: AsRef<OsStr> + Debug, U: AsRef<OsStr> + Debug>(
&self,
cmd: T,
args: &[U],
) -> Option<CommandOutput> {
log::trace!(
"Executing command {:?} with args {:?} from context",
cmd,
args
);
#[cfg(test)]
{
let command = crate::utils::display_command(&cmd, args);
if let Some(output) = self
.cmd
.get(command.as_str())
.cloned()
.or_else(|| crate::utils::mock_cmd(&cmd, args))
{
return output;
}
}
let mut cmd = create_command(cmd).ok()?;
cmd.args(args).current_dir(&self.current_dir);
exec_timeout(
&mut cmd,
Duration::from_millis(self.root_config.command_timeout),
)
}
/// Attempt to execute several commands with `exec_cmd`, return the results of the first that works
pub fn exec_cmds_return_first(&self, commands: Vec<Vec<&str>>) -> Option<CommandOutput> {
commands
.iter()
.find_map(|attempt| self.exec_cmd(attempt[0], &attempt[1..]))
}
/// Returns the string contents of a file from the current working directory
pub fn read_file_from_pwd(&self, file_name: &str) -> Option<String> {
if !self.try_begin_scan()?.set_files(&[file_name]).is_match() {
log::debug!(
"Not attempting to read {file_name} because, it was not found during scan."
);
return None;
}
read_file(self.current_dir.join(file_name)).ok()
}
}
#[derive(Debug)]
pub struct DirContents {
// HashSet of all files, no folders, relative to the base directory given at construction.
files: HashSet<PathBuf>,
// HashSet of all file names, e.g. the last section without any folders, as strings.
file_names: HashSet<String>,
// HashSet of all folders, relative to the base directory given at construction.
folders: HashSet<PathBuf>,
// HashSet of all extensions found, without dots, e.g. "js" instead of ".js".
extensions: HashSet<String>,
}
impl DirContents {
#[cfg(test)]
fn from_path(base: &Path) -> Result<Self, std::io::Error> {
Self::from_path_with_timeout(base, Duration::from_secs(30))
}
fn from_path_with_timeout(base: &Path, timeout: Duration) -> Result<Self, std::io::Error> {
let start = Instant::now();
let mut folders: HashSet<PathBuf> = HashSet::new();
let mut files: HashSet<PathBuf> = HashSet::new();
let mut file_names: HashSet<String> = HashSet::new();
let mut extensions: HashSet<String> = HashSet::new();
fs::read_dir(base)?
.enumerate()
.take_while(|(n, _)| {
cfg!(test) // ignore timeout during tests
|| n & 0xFF != 0 // only check timeout once every 2^8 entries
|| start.elapsed() < timeout
})
.filter_map(|(_, entry)| entry.ok())
.for_each(|entry| {
let path = PathBuf::from(entry.path().strip_prefix(base).unwrap());
if entry.path().is_dir() {
folders.insert(path);
} else {
if !path.to_string_lossy().starts_with('.') {
path.extension()
.map(|ext| extensions.insert(ext.to_string_lossy().to_string()));
}
if let Some(file_name) = path.file_name() {
file_names.insert(file_name.to_string_lossy().to_string());
}
files.insert(path);
}
});
log::trace!(
"Building HashSets of directory files, folders and extensions took {:?}",
start.elapsed()
);
Ok(Self {
files,
file_names,
folders,
extensions,
})
}
pub fn files(&self) -> impl Iterator<Item = &PathBuf> {
self.files.iter()
}
pub fn has_file(&self, path: &str) -> bool {
self.files.contains(Path::new(path))
}
pub fn has_file_name(&self, name: &str) -> bool {
self.file_names.contains(name)
}
pub fn has_any_file_name(&self, names: &[&str]) -> bool {
names.iter().any(|name| self.has_file_name(name))
}
pub fn has_folder(&self, path: &str) -> bool {
self.folders.contains(Path::new(path))
}
pub fn has_any_folder(&self, paths: &[&str]) -> bool {
paths.iter().any(|path| self.has_folder(path))
}
pub fn has_extension(&self, ext: &str) -> bool {
self.extensions.contains(ext)
}
pub fn has_any_extension(&self, exts: &[&str]) -> bool {
exts.iter().any(|ext| self.has_extension(ext))
}
}
pub struct Repo {
/// If `current_dir` is a git repository or is contained within one,
/// this is the current branch name of that repo.
pub branch: Option<String>,
/// If `current_dir` is a git repository or is contained within one,
/// this is the path to the root of that repo.
pub workdir: Option<PathBuf>,
/// The path of the repository's `.git` directory.
pub path: PathBuf,
/// State
pub state: RepositoryState,
/// Remote repository
pub remote: Option<Remote>,
}
impl Repo {
/// Opens the associated git repository.
pub fn open(&self) -> Result<Repository, git2::Error> {
Repository::open(&self.path)
}
}
/// Remote repository
pub struct Remote {
pub branch: Option<String>,
pub name: Option<String>,
}
// A struct of Criteria which will be used to verify current PathBuf is
// of X language, criteria can be set via the builder pattern
pub struct ScanDir<'a> {
dir_contents: &'a DirContents,
files: &'a [&'a str],
folders: &'a [&'a str],
extensions: &'a [&'a str],
}
impl<'a> ScanDir<'a> {
#[must_use]
pub const fn set_files(mut self, files: &'a [&'a str]) -> Self {
self.files = files;
self
}
#[must_use]
pub const fn set_extensions(mut self, extensions: &'a [&'a str]) -> Self {
self.extensions = extensions;
self
}
#[must_use]
pub const fn set_folders(mut self, folders: &'a [&'a str]) -> Self {
self.folders = folders;
self
}
/// based on the current `PathBuf` check to see
/// if any of this criteria match or exist and returning a boolean
pub fn is_match(&self) -> bool {
self.dir_contents.has_any_extension(self.extensions)
|| self.dir_contents.has_any_folder(self.folders)
|| self.dir_contents.has_any_file_name(self.files)
}
}
fn get_current_branch(repository: &Repository) -> Option<String> {
let head = match repository.head() {
Ok(reference) => reference,
Err(e) => {
return if e.code() == UnbornBranch {
// HEAD should only be an unborn branch if the repository is fresh,
// in that case read directly from `.git/HEAD`
let mut head_path = repository.path().to_path_buf();
head_path.push("HEAD");
// get first line, then last path segment
fs::read_to_string(&head_path)
.ok()?
.lines()
.next()?
.trim()
.split('/')
.last()
.map(std::borrow::ToOwned::to_owned)
} else {
None
};
}
};
let shorthand = head.shorthand();
shorthand.map(std::string::ToString::to_string)
}
fn get_remote_repository_info(repository: &Repository) -> Option<Remote> {
if let Ok(head) = repository.head() {
if let Some(local_branch_ref) = head.name() {
let remote_ref = match repository.branch_upstream_name(local_branch_ref) {
Ok(remote_ref) => remote_ref.as_str()?.to_owned(),
Err(_) => return None,
};
let mut v = remote_ref.splitn(4, '/');
let remote_name = v.nth(2)?.to_owned();
let remote_branch = v.last()?.to_owned();
return Some(Remote {
branch: Some(remote_branch),
name: Some(remote_name),
});
}
}
None
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Shell {
Bash,
Fish,
Ion,
PowerShell,
Zsh,
Elvish,
Tcsh,
Nu,
Xonsh,
Cmd,
Unknown,
}
/// Which kind of prompt target to print (main prompt, rprompt, ...)
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Target {
Main,
Right,
Continuation,
}
/// Properties as passed on from the shell as arguments
#[derive(Parser, Debug)]
pub struct Properties {
/// The status code of the previously run command as an unsigned or signed 32bit integer
#[clap(short = 's', long = "status")]
pub status_code: Option<String>,
/// Bash, Fish and Zsh support returning codes for each process in a pipeline.
#[clap(long, value_delimiter = ' ')]
pub pipestatus: Option<Vec<String>>,
/// The width of the current interactive terminal.
#[clap(short = 'w', long, default_value_t=default_width(), value_parser=parse_width)]
terminal_width: usize,
/// The path that the prompt should render for.
#[clap(short, long)]
path: Option<PathBuf>,
/// The logical path that the prompt should render for.
/// This path should be a virtual/logical representation of the PATH argument.
#[clap(short = 'P', long)]
logical_path: Option<PathBuf>,
/// The execution duration of the last command, in milliseconds
#[clap(short = 'd', long)]
pub cmd_duration: Option<String>,
/// The keymap of fish/zsh/cmd
#[clap(short = 'k', long, default_value = "viins")]
pub keymap: String,
/// The number of currently running jobs
#[clap(short, long, default_value_t, value_parser=parse_jobs)]
pub jobs: i64,
}
impl Default for Properties {
fn default() -> Self {
Self {
status_code: None,
pipestatus: None,
terminal_width: default_width(),
path: None,
logical_path: None,
cmd_duration: None,
keymap: "viins".to_string(),
jobs: 0,
}
}
}
/// Parse String, but treat empty strings as `None`
fn parse_trim<F: FromStr>(value: &str) -> Option<Result<F, F::Err>> {
let value = value.trim();
if value.is_empty() {
return None;
}
Some(F::from_str(value))
}
fn parse_jobs(jobs: &str) -> Result<i64, ParseIntError> {
parse_trim(jobs).unwrap_or(Ok(0))
}
fn default_width() -> usize {
terminal_size().map_or(80, |(w, _)| w.0 as usize)
}
fn parse_width(width: &str) -> Result<usize, ParseIntError> {
parse_trim(width).unwrap_or_else(|| Ok(default_width()))
}
#[cfg(test)]
mod tests {
use super::*;
use std::io;
fn testdir(paths: &[&str]) -> Result<tempfile::TempDir, std::io::Error> {
let dir = tempfile::tempdir()?;
for path in paths {
let p = dir.path().join(Path::new(path));
if let Some(parent) = p.parent() {
fs::create_dir_all(parent)?;
}
fs::File::create(p)?.sync_all()?;
}
Ok(dir)
}
#[test]
fn test_scan_dir() -> Result<(), Box<dyn std::error::Error>> {
let empty = testdir(&[])?;
let empty_dc = DirContents::from_path(empty.path())?;
assert!(!ScanDir {
dir_contents: &empty_dc,
files: &["package.json"],
extensions: &["js"],
folders: &["node_modules"],
}
.is_match());
empty.close()?;
let rust = testdir(&["README.md", "Cargo.toml", "src/main.rs"])?;
let rust_dc = DirContents::from_path(rust.path())?;
assert!(!ScanDir {
dir_contents: &rust_dc,
files: &["package.json"],
extensions: &["js"],
folders: &["node_modules"],
}
.is_match());
rust.close()?;
let java = testdir(&["README.md", "src/com/test/Main.java", "pom.xml"])?;
let java_dc = DirContents::from_path(java.path())?;
assert!(!ScanDir {
dir_contents: &java_dc,
files: &["package.json"],
extensions: &["js"],
folders: &["node_modules"],
}
.is_match());
java.close()?;
let node = testdir(&["README.md", "node_modules/lodash/main.js", "package.json"])?;
let node_dc = DirContents::from_path(node.path())?;
assert!(ScanDir {
dir_contents: &node_dc,
files: &["package.json"],
extensions: &["js"],
folders: &["node_modules"],
}
.is_match());
node.close()?;
Ok(())
}
#[test]
fn context_constructor_should_canonicalize_current_dir() -> io::Result<()> {
#[cfg(not(windows))]
use std::os::unix::fs::symlink as symlink_dir;
#[cfg(windows)]
use std::os::windows::fs::symlink_dir;
let tmp_dir = tempfile::TempDir::new()?;
let path = tmp_dir.path().join("a/xxx/yyy");
fs::create_dir_all(&path)?;
// Set up a mock symlink
let path_actual = tmp_dir.path().join("a/xxx");
let path_symlink = tmp_dir.path().join("a/symlink");
symlink_dir(&path_actual, &path_symlink).expect("create symlink");
// Mock navigation into the symlink path
let test_path = path_symlink.join("yyy");
let context = Context::new_with_shell_and_path(
Default::default(),
Shell::Unknown,
Target::Main,
test_path.clone(),
test_path.clone(),
);
assert_ne!(context.current_dir, context.logical_dir);
let expected_current_dir =
dunce::canonicalize(path_actual.join("yyy")).expect("canonicalize");
assert_eq!(expected_current_dir, context.current_dir);
let expected_logical_dir = test_path;
assert_eq!(expected_logical_dir, context.logical_dir);
tmp_dir.close()
}
#[test]
fn context_constructor_should_fail_gracefully_when_canonicalization_fails() {
// Mock navigation to a directory which does not exist on disk
let test_path = Path::new("/path_which_does_not_exist").to_path_buf();
let context = Context::new_with_shell_and_path(
Default::default(),
Shell::Unknown,
Target::Main,
test_path.clone(),
test_path.clone(),
);
let expected_current_dir = &test_path;
assert_eq!(expected_current_dir, &context.current_dir);
let expected_logical_dir = &test_path;
assert_eq!(expected_logical_dir, &context.logical_dir);
}
#[test]
fn context_constructor_should_fall_back_to_tilde_replacement_when_canonicalization_fails() {
use utils::home_dir;
// Mock navigation to a directory which does not exist on disk
let test_path = Path::new("~/path_which_does_not_exist").to_path_buf();
let context = Context::new_with_shell_and_path(
Default::default(),
Shell::Unknown,
Target::Main,
test_path.clone(),
test_path.clone(),
);
let expected_current_dir = home_dir()
.expect("home_dir")
.join("path_which_does_not_exist");
assert_eq!(expected_current_dir, context.current_dir);
let expected_logical_dir = test_path;
assert_eq!(expected_logical_dir, context.logical_dir);
}
#[cfg(windows)]
#[test]
fn strip_extended_path_prefix() {
let test_path = Path::new(r"\\?\C:\").to_path_buf();
let context = Context::new_with_shell_and_path(
Properties::default(),
Shell::Unknown,
Target::Main,
test_path.clone(),
test_path,
);
let expected_path = Path::new(r"C:\");
assert_eq!(&context.current_dir, expected_path);
}
}
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