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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
pub fn segment(_: &ArgMatches) -> Segment {
const COLOR_DIR: Color = Color::Cyan;
const DIR_TRUNCATION_LENGTH: usize = 3;
const HOME_SYMBOL: &str = "~";
let current_path = env::current_dir()
.expect("Unable to identify current directory")
.canonicalize()
.expect("Unable to canonicalize current directory");
let dir_string;
if let Ok(repo) = git2::Repository::discover(¤t_path) {
let repo_root = get_repo_root(repo);
// The folder name is the last component to the repo path
let repo_folder_name = repo_root
.components()
.last()
.unwrap()
.as_os_str()
.to_str()
.unwrap();
dir_string = truncate_path(
&DIR_TRUNCATION_LENGTH,
¤t_path,
&repo_root,
&repo_folder_name,
);
} else {
let home_dir = dirs::home_dir().unwrap();
dir_string = truncate_path(
&DIR_TRUNCATION_LENGTH,
¤t_path,
&home_dir,
HOME_SYMBOL,
);
}
Segment {
value: dir_string,
style: Style::from(COLOR_DIR).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()
}
}
/// Truncate a path to a predefined number of path components
///
/// Trim the path in the prompt to only have the last few paths, set by `length`.
/// This function also serves to replace the top-level path of the prompt.
/// This can be used to replace the path to a git repo with only the repo
/// directory name.
fn truncate_path(
length: &usize,
full_path: &PathBuf,
top_level_path: &PathBuf,
top_level_replacement: &str,
) -> String {
if full_path == top_level_path {
return top_level_replacement.to_string();
}
let full_path_depth = full_path.components().count();
let top_level_path_depth = top_level_path.components().count();
// Don't bother with replacing top level path if length is long enough
if full_path_depth - top_level_path_depth >= *length {
return full_path
.iter()
.skip(full_path_depth - length)
.collect::<PathBuf>()
.to_str()
.unwrap()
.to_string();
}
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()
)
}
#[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, "/");
}
}
|
