ls_tiny/
lib.rs

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1//! **ls-tiny** is a less functional `ls` command
2//! it is somewhat richer than when no argument to the ls command is specified. (Because it's a little colored.)
3
4#[macro_use]
5extern crate clap;
6use clap::{Arg, App};
7use colored::Colorize;
8use std::path::{Path, PathBuf};
9
10/// The Config structure has four fields
11/// * the path of the directory you want to look up
12/// * the number of directories
13/// * the number of files
14/// * the total number of them.
15pub struct Config {
16    /// directory name given by the first argument
17    search_dir: PathBuf,
18    /// Number of directories
19    dirs: u64,
20    /// Number of files
21    files: u64,
22    /// total entries
23    entries: u64
24}
25
26/// Define the initial value of the Config structure.
27impl Default for Config {
28    fn default() -> Self {
29        Self {
30            search_dir: PathBuf::new(),
31            dirs: 0,
32            files: 0,
33            entries: 0
34        }
35    }
36}
37
38
39impl Config {
40    /// parse the arguments.
41    /// If you want more information, such as methods, check out the following links
42    /// clap https://crates.io/crates/clap
43    fn parse_arguments<'a>() -> clap::ArgMatches<'a> {
44        App::new(crate_name!())
45            .version(crate_version!())      
46            .author(crate_authors!())       
47            .about(crate_description!())
48            .arg(Arg::with_name("PATH")
49                .help("Sets the directory") 
50                .required(true)
51                .index(1)
52            )
53            .get_matches()
54    }
55
56    /// If an existing directory is specified, the Ok-wrapped Config structure is returned.
57    /// Assign the directory specified by the first argument to the search_dir field of the Config structure. 
58    /// All other fields are assigned a 0.(call the default method)
59    /// 
60    /// # Panics 
61    /// An error is returned when the first argument is a file or a non-existent directory is specified.
62    pub fn new() -> Result<Config, String> {
63        let matches = Self::parse_arguments();
64        let mut search_dir = PathBuf::new();
65
66        if let Some(path) = matches.value_of("PATH") {
67            search_dir.push(path);
68        }
69
70        if search_dir.is_file() {
71            return Err(format!("error: sets the directory"));
72        }
73    
74        if !search_dir.exists() {
75            return Err(format!("error: {} cannot find", search_dir.display()));
76        }
77
78        Ok( Config { search_dir, ..Config::default() } )
79    }
80
81    /// check the entries in the directory specified by the first argument.
82    /// If you want to know more about specifying colors, see the following links:
83    /// [colored](https://crates.io/crates/colored)
84    pub fn run(&mut self) {
85        for dir_entry in self.search_dir.read_dir().expect("cannot read dir") {
86    
87            self.entries += 1;
88    
89            if let Ok(entry) = dir_entry {
90                let entry_type = if entry.path().is_file() {
91                    self.files += 1;
92                    "file".green()
93                } else {
94                    self.dirs += 1;
95                    "dir ".cyan()
96                };
97    
98                println!("{}: {} - {}", self.entries , entry_type , get_name(&entry.path()));
99            }
100        }
101
102        // let dir_name = get_name(self.search_dir.as_path()).magenta();
103        let dir_name = self.search_dir.as_path().to_str().unwrap().magenta();
104        let entries = self.entries.to_string().magenta();
105
106        println!("\ndir: {}, file: {}", self.dirs.to_string().cyan(), self.files.to_string().green());
107        println!("{} directory has {} entries.", dir_name, entries);
108    }
109}
110
111/// extracts only the name from the path
112fn get_name(path: &Path) -> &str {   
113    path.file_name().unwrap().to_str().unwrap()
114}
ls_tiny/lib.rs

ls_tiny/
lib.rs
