logo
  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
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142

// Std
use std::io::Write;

// Internal
use crate::utils;
use crate::Generator;
use crate::INTERNAL_ERROR_MSG;
use clap::*;

/// Generate elvish completion file
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct Elvish;

impl Generator for Elvish {
    fn file_name(&self, name: &str) -> String {
        format!("{}.elv", name)
    }

    fn generate(&self, app: &App, buf: &mut dyn Write) {
        let bin_name = app.get_bin_name().unwrap();

        let mut names = vec![];
        let subcommands_cases = generate_inner(app, "", &mut names);

        let result = format!(
            r#"
use builtin;
use str;

set edit:completion:arg-completer[{bin_name}] = [@words]{{
    fn spaces [n]{{
        builtin:repeat $n ' ' | str:join ''
    }}
    fn cand [text desc]{{
        edit:complex-candidate $text &display=$text' '(spaces (- 14 (wcswidth $text)))$desc
    }}
    var command = '{bin_name}'
    for word $words[1..-1] {{
        if (str:has-prefix $word '-') {{
            break
        }}
        set command = $command';'$word
    }}
    var completions = [{subcommands_cases}
    ]
    $completions[$command]
}}
"#,
            bin_name = bin_name,
            subcommands_cases = subcommands_cases
        );

        w!(buf, result.as_bytes());
    }
}

// Escape string inside single quotes
fn escape_string(string: &str) -> String {
    string.replace("'", "''")
}

fn get_tooltip<T: ToString>(help: Option<&str>, data: T) -> String {
    match help {
        Some(help) => escape_string(help),
        _ => data.to_string(),
    }
}

fn generate_inner<'help>(
    p: &App<'help>,
    previous_command_name: &str,
    names: &mut Vec<&'help str>,
) -> String {
    debug!("generate_inner");

    let command_name = if previous_command_name.is_empty() {
        p.get_bin_name().expect(INTERNAL_ERROR_MSG).to_string()
    } else {
        format!("{};{}", previous_command_name, &p.get_name())
    };

    let mut completions = String::new();
    let preamble = String::from("\n            cand ");

    for option in p.get_opts() {
        if let Some(shorts) = option.get_short_and_visible_aliases() {
            let tooltip = get_tooltip(option.get_help(), shorts[0]);
            for short in shorts {
                completions.push_str(&preamble);
                completions.push_str(format!("-{} '{}'", short, tooltip).as_str());
            }
        }

        if let Some(longs) = option.get_long_and_visible_aliases() {
            let tooltip = get_tooltip(option.get_help(), longs[0]);
            for long in longs {
                completions.push_str(&preamble);
                completions.push_str(format!("--{} '{}'", long, tooltip).as_str());
            }
        }
    }

    for flag in utils::flags(p) {
        if let Some(shorts) = flag.get_short_and_visible_aliases() {
            let tooltip = get_tooltip(flag.get_help(), shorts[0]);
            for short in shorts {
                completions.push_str(&preamble);
                completions.push_str(format!("-{} '{}'", short, tooltip).as_str());
            }
        }

        if let Some(longs) = flag.get_long_and_visible_aliases() {
            let tooltip = get_tooltip(flag.get_help(), longs[0]);
            for long in longs {
                completions.push_str(&preamble);
                completions.push_str(format!("--{} '{}'", long, tooltip).as_str());
            }
        }
    }

    for subcommand in p.get_subcommands() {
        let data = &subcommand.get_name();
        let tooltip = get_tooltip(subcommand.get_about(), data);

        completions.push_str(&preamble);
        completions.push_str(format!("{} '{}'", data, tooltip).as_str());
    }

    let mut subcommands_cases = format!(
        r"
        &'{}'= {{{}
        }}",
        &command_name, completions
    );

    for subcommand in p.get_subcommands() {
        let subcommand_subcommands_cases = generate_inner(subcommand, &command_name, names);
        subcommands_cases.push_str(&subcommand_subcommands_cases);
    }

    subcommands_cases
}