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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187

use std::str::FromStr;

#[cfg(feature = "clap")]
use itertools::Itertools;
use kdl::{KdlEntry, KdlNode};

use crate::error::UsageErr;

#[derive(Debug, Default)]
pub struct Arg {
    pub name: String,
    pub help: Option<String>,
    pub long_help: Option<String>,
    pub required: bool,
    pub var: bool,
    pub var_min: Option<i64>,
    pub var_max: Option<i64>,
    pub hide: bool,
    pub default: Option<String>,
}

impl Arg {
    pub fn usage(&self) -> String {
        let mut name = if self.required {
            format!("<{}>", self.name)
        } else {
            format!("[{}]", self.name)
        };
        if self.var {
            name = format!("{}...", name);
        }
        name
    }
}

impl From<&Arg> for KdlNode {
    fn from(arg: &Arg) -> Self {
        let mut node = KdlNode::new("arg");
        node.push(KdlEntry::new(arg.usage()));
        if let Some(desc) = &arg.help {
            node.push(KdlEntry::new_prop("help", desc.clone()));
        }
        if let Some(desc) = &arg.long_help {
            node.push(KdlEntry::new_prop("long_help", desc.clone()));
        }
        if arg.var {
            node.push(KdlEntry::new_prop("var", true));
        }
        if let Some(min) = arg.var_min {
            node.push(KdlEntry::new_prop("var_min", min));
        }
        if let Some(max) = arg.var_max {
            node.push(KdlEntry::new_prop("var_max", max));
        }
        if arg.hide {
            node.push(KdlEntry::new_prop("hide", true));
        }
        if let Some(default) = &arg.default {
            node.push(KdlEntry::new_prop("default", default.clone()));
        }
        node
    }
}

impl TryFrom<&KdlNode> for Arg {
    type Error = UsageErr;
    fn try_from(node: &KdlNode) -> Result<Self, UsageErr> {
        let mut arg: Arg = node
            .entries()
            .first()
            .and_then(|e| e.value().as_string())
            .map(|s| s.parse())
            .transpose()?
            .unwrap_or_default();
        for entry in node.entries().iter().skip(1) {
            match entry.name().unwrap().to_string().as_str() {
                "help" => arg.help = entry.value().as_string().map(|s| s.to_string()),
                "long_help" => arg.long_help = entry.value().as_string().map(|s| s.to_string()),
                "required" => arg.required = entry.value().as_bool().unwrap(),
                "var" => arg.var = entry.value().as_bool().unwrap(),
                "hide" => arg.hide = entry.value().as_bool().unwrap(),
                "var_min" => arg.var_min = entry.value().as_i64(),
                "var_max" => arg.var_max = entry.value().as_i64(),
                "default" => arg.default = entry.value().as_string().map(|s| s.to_string()),
                _ => Err(UsageErr::InvalidInput(
                    entry.to_string(),
                    *entry.span(),
                    node.to_string(),
                ))?,
            }
        }
        Ok(arg)
    }
}

impl From<&str> for Arg {
    fn from(input: &str) -> Self {
        let mut arg = Arg {
            name: input.to_string(),
            required: true,
            ..Default::default()
        };
        if input.strip_suffix("...").is_some() {
            arg.var = true;
            arg.name = arg.name[..arg.name.len() - 3].to_string();
        }
        let first = arg.name.chars().next().unwrap_or_default();
        let last = arg.name.chars().last().unwrap_or_default();
        match (first, last) {
            ('[', ']') => {
                arg.name = arg.name[1..arg.name.len() - 1].to_string();
                arg.required = false;
            }
            ('<', '>') => {
                arg.name = arg.name[1..arg.name.len() - 1].to_string();
            }
            _ => {}
        }
        arg
    }
}
impl FromStr for Arg {
    type Err = UsageErr;
    fn from_str(input: &str) -> std::result::Result<Self, UsageErr> {
        Ok(input.into())
    }
}

#[cfg(feature = "clap")]
impl From<&clap::Arg> for Arg {
    fn from(arg: &clap::Arg) -> Self {
        let required = arg.is_required_set();
        let help = arg.get_help().map(|s| s.to_string());
        let long_help = arg.get_long_help().map(|s| s.to_string());
        let hide = arg.is_hide_set();
        let var = matches!(
            arg.get_action(),
            clap::ArgAction::Count | clap::ArgAction::Append
        );
        Self {
            name: arg
                .get_value_names()
                .unwrap_or_default()
                .first()
                .cloned()
                .unwrap_or_default()
                .to_string(),
            required,
            help,
            long_help,
            var,
            var_max: None,
            var_min: None,
            hide,
            default: if arg.get_default_values().is_empty() {
                None
            } else {
                Some(
                    arg.get_default_values()
                        .iter()
                        .map(|v| v.to_string_lossy().to_string())
                        .join("|"),
                )
            },
        }
    }
}

#[cfg(feature = "clap")]
impl From<&Arg> for clap::Arg {
    fn from(arg: &Arg) -> Self {
        let mut a = clap::Arg::new(&arg.name);
        if let Some(desc) = &arg.help {
            a = a.help(desc);
        }
        if arg.required {
            a = a.required(true);
        }
        // if arg.multiple {
        //     a = a.multiple(true);
        // }
        if arg.hide {
            a = a.hide_possible_values(true);
        }
        a
    }
}