cicada 1.2.2

A simple Bash-like Unix shell.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84

use regex::Regex;

use crate::builtins::utils::print_stderr_with_capture;
use crate::builtins::utils::print_stdout_with_capture;
use crate::shell;
use crate::tools;
use crate::types::{Command, CommandLine, CommandResult};

pub fn run(
    sh: &mut shell::Shell,
    cl: &CommandLine,
    cmd: &Command,
    capture: bool,
) -> CommandResult {
    let mut cr = CommandResult::new();
    let tokens = cmd.tokens.clone();

    if tokens.len() == 1 {
        return show_alias_list(sh, cmd, cl, capture);
    }

    if tokens.len() > 2 {
        let info = "alias syntax error: usage: alias foo='echo foo'";
        print_stderr_with_capture(info, &mut cr, cl, cmd, capture);
        return cr;
    }

    let input = &tokens[1].1;
    let re_single_read = Regex::new(r"^[a-zA-Z0-9_\.-]+$").unwrap();
    if re_single_read.is_match(input) {
        return show_single_alias(sh, input, cmd, cl, capture);
    }

    let re_to_add = Regex::new(r"^([a-zA-Z0-9_\.-]+)=(.*)$").unwrap();
    for cap in re_to_add.captures_iter(input) {
        let name = tools::unquote(&cap[1]);
        // due to limitation of `parses::parser_line`,
        // `alias foo-bar='foo bar'` will become 'foo-bar=foo bar'
        // while `alias foo_bar='foo bar'` keeps foo_bar='foo bar'
        let value = if cap[2].starts_with('"') || cap[2].starts_with('\'') {
            tools::unquote(&cap[2])
        } else {
            cap[2].to_string()
        };
        sh.add_alias(name.as_str(), value.as_str());
    }

    CommandResult::new()
}

fn show_alias_list(
    sh: &shell::Shell,
    cmd: &Command,
    cl: &CommandLine,
    capture: bool,
) -> CommandResult {
    let mut lines = Vec::new();
    for (name, value) in sh.get_alias_list() {
        let line = format!("alias {}='{}'", name, value);
        lines.push(line);
    }
    let buffer = lines.join("\n");
    let mut cr = CommandResult::new();
    print_stdout_with_capture(&buffer, &mut cr, cl, cmd, capture);
    cr
}

fn show_single_alias(
    sh: &shell::Shell,
    name_to_find: &str,
    cmd: &Command,
    cl: &CommandLine,
    capture: bool,
) -> CommandResult {
    let mut cr = CommandResult::new();
    if let Some(content) = sh.get_alias_content(name_to_find) {
        let info = format!("alias {}='{}'", name_to_find, content);
        print_stdout_with_capture(&info, &mut cr, cl, cmd, capture);
    } else {
        let info = format!("cicada: alias: {}: not found", name_to_find);
        print_stderr_with_capture(&info, &mut cr, cl, cmd, capture);
    }
    cr
}