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|
use super::Segment;
use ansi_term::{Color, Style};
use clap::ArgMatches;
use dirs;
use git2::Repository;
use std::env;
use std::path::PathBuf;
/// Creates a segment with the current directory
///
/// Will perform path contraction and truncation.
/// **Contraction**
/// - Paths begining with the home directory will be contracted to `~`
/// - Paths containing a git repo will contract to begin at the repo root
///
/// **Truncation**
/// Paths will be limited in length to `3` path components by default.
pub fn segment(_: &ArgMatches) -> Segment {
const SECTION_COLOR: Color = Color::Cyan;
const DIR_TRUNCATION_LENGTH: usize = 3;
const HOME_SYMBOL: &str = "~";
// TODO: Currently gets the physical directory. Get the logical directory.
let current_path = env::current_dir().expect("Unable to identify current directory");
let dir_string;
if let Ok(repo) = git2::Repository::discover(¤t_path) {
// Contract the path to the git repo root
let repo_root = get_repo_root(repo);
let repo_folder_name = repo_root
.components()
.last()
.unwrap()
.as_os_str()
.to_str()
.unwrap();
dir_string = contract_path(¤t_path, &repo_root, &repo_folder_name);
} else {
// Contract the path to the home directory
let home_dir = dirs::home_dir().unwrap();
dir_string = contract_path(¤t_path, &home_dir, HOME_SYMBOL);
}
// Truncate the dir string to the maximum number of path components
let truncated_dir_string = truncate(dir_string, DIR_TRUNCATION_LENGTH);
Segment {
value: truncated_dir_string,
style: Style::from(SECTION_COLOR).bold(),
..Default::default()
}
}
/// Get the root directory of a git repo
fn get_repo_root(repo: Repository) -> PathBuf {
if repo.is_bare() {
// Bare repos will return the repo root
repo.path().to_path_buf()
} else {
// Non-bare repos will return the path of `.git`
repo.path().parent().unwrap().to_path_buf()
}
}
/// Contract the root component of a path
fn contract_path(
full_path: &PathBuf,
top_level_path: &PathBuf,
top_level_replacement: &str,
) -> String {
if !full_path.starts_with(top_level_path) {
return full_path.to_str().unwrap().to_string();
}
if full_path == top_level_path {
return top_level_replacement.to_string();
}
let top_level_path_depth = top_level_path.components().count();
format!(
"{replacement}{separator}{path}",
replacement = top_level_replacement,
separator = std::path::MAIN_SEPARATOR,
path = full_path
.iter()
.skip(top_level_path_depth)
.collect::<PathBuf>()
.to_str()
.unwrap()
)
}
/// Truncate a path to only have a set number of path components
fn truncate(dir_string: String, length: usize) -> String {
if length == 0 {
return dir_string;
}
let components = dir_string
.split(std::path::MAIN_SEPARATOR)
.collect::<Vec<&str>>();
if components.len() < length {
return dir_string;
}
let truncated_components = &components[..length];
truncated_components.join(&std::path::MAIN_SEPARATOR.to_string())
}
#[cfg(test)]
mod tests {
// TODO: Look into stubbing `env` so that tests can be run in parallel
use super::*;
use clap::{App, Arg};
use std::path::Path;
#[test]
fn truncate_home_dir() {
let args = App::new("starship")
.arg(Arg::with_name("status_code"))
.get_matches_from(vec!["starship", "0"]);
let home_dir = dirs::home_dir().unwrap();
env::set_current_dir(&home_dir).unwrap();
let segment = segment(&args);
assert_eq!(segment.value, "~");
}
#[test]
fn dont_truncate_non_home_dir() {
let args = App::new("starship")
.arg(Arg::with_name("status_code"))
.get_matches_from(vec!["starship", "0"]);
let root_dir = Path::new("/");
env::set_current_dir(&root_dir).unwrap();
let segment = segment(&args);
assert_eq!(segment.value, "/");
}
#[test]
fn do_not_canonicalize_paths() {
let args = App::new("starship")
.arg(Arg::with_name("status_code"))
.get_matches_from(vec!["starship", "0"]);
let root_dir = Path::new("/var");
env::set_current_dir(&root_dir).unwrap();
let segment = segment(&args);
assert_eq!(segment.value, "/var");
}
}
|
