spin_templates/
interaction.rs

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
use std::{collections::HashMap, path::Path};

use crate::{
    cancellable::Cancellable,
    template::{TemplateParameter, TemplateParameterDataType},
    Run,
};

use anyhow::anyhow;
// use console::style;
use dialoguer::{Confirm, Input};

pub(crate) trait InteractionStrategy {
    fn allow_generate_into(&self, target_dir: &Path) -> Cancellable<(), anyhow::Error>;
    fn populate_parameters(
        &self,
        run: &Run,
    ) -> Cancellable<HashMap<String, String>, anyhow::Error> {
        let mut values = HashMap::new();
        for parameter in run.template.parameters(&run.options.variant) {
            match self.populate_parameter(run, parameter) {
                Cancellable::Ok(value) => {
                    values.insert(parameter.id().to_owned(), value);
                }
                Cancellable::Cancelled => return Cancellable::Cancelled,
                Cancellable::Err(e) => return Cancellable::Err(e),
            }
        }
        Cancellable::Ok(values)
    }
    fn populate_parameter(
        &self,
        run: &Run,
        parameter: &TemplateParameter,
    ) -> Cancellable<String, anyhow::Error>;
}

pub(crate) struct Interactive;
pub(crate) struct Silent;

impl InteractionStrategy for Interactive {
    fn allow_generate_into(&self, target_dir: &Path) -> Cancellable<(), anyhow::Error> {
        if !is_directory_empty(target_dir) {
            let prompt = format!(
                "Directory '{}' already contains other files. Generate into it anyway?",
                target_dir.display()
            );
            match crate::interaction::confirm(&prompt) {
                Ok(true) => Cancellable::Ok(()),
                Ok(false) => Cancellable::Cancelled,
                Err(e) => Cancellable::Err(e.into()),
            }
        } else {
            Cancellable::Ok(())
        }
    }

    fn populate_parameter(
        &self,
        run: &Run,
        parameter: &TemplateParameter,
    ) -> Cancellable<String, anyhow::Error> {
        match run.options.values.get(parameter.id()) {
            Some(s) => Cancellable::Ok(s.clone()),
            None => match (run.options.accept_defaults, parameter.default_value()) {
                (true, Some(v)) => Cancellable::Ok(v.to_string()),
                _ => match crate::interaction::prompt_parameter(parameter) {
                    Some(v) => Cancellable::Ok(v),
                    None => Cancellable::Cancelled,
                },
            },
        }
    }
}

impl InteractionStrategy for Silent {
    fn allow_generate_into(&self, target_dir: &Path) -> Cancellable<(), anyhow::Error> {
        if is_directory_empty(target_dir) {
            Cancellable::Ok(())
        } else {
            let err = anyhow!(
                "Can't generate into {} as it already contains other files",
                target_dir.display()
            );
            Cancellable::Err(err)
        }
    }

    fn populate_parameter(
        &self,
        run: &Run,
        parameter: &TemplateParameter,
    ) -> Cancellable<String, anyhow::Error> {
        match run.options.values.get(parameter.id()) {
            Some(s) => Cancellable::Ok(s.clone()),
            None => match (run.options.accept_defaults, parameter.default_value()) {
                (true, Some(v)) => Cancellable::Ok(v.to_string()),
                _ => Cancellable::Err(anyhow!("Parameter '{}' not provided", parameter.id())),
            },
        }
    }
}

pub(crate) fn confirm(text: &str) -> dialoguer::Result<bool> {
    Confirm::new().with_prompt(text).interact()
}

pub(crate) fn prompt_parameter(parameter: &TemplateParameter) -> Option<String> {
    let prompt = parameter.prompt();
    let default_value = parameter.default_value();

    loop {
        let input = match parameter.data_type() {
            TemplateParameterDataType::String(_) => ask_free_text(prompt, default_value),
        };

        match input {
            Ok(text) => match parameter.validate_value(text) {
                Ok(text) => return Some(text),
                Err(e) => {
                    println!("Invalid value: {}", e);
                }
            },
            Err(e) => {
                println!("Invalid value: {}", e);
            }
        }
    }
}

fn ask_free_text(prompt: &str, default_value: &Option<String>) -> anyhow::Result<String> {
    let mut input = Input::<String>::new();
    input = input.with_prompt(prompt);
    if let Some(s) = default_value {
        input = input.default(s.to_owned());
    }
    let result = input.interact_text()?;
    Ok(result)
}

fn is_directory_empty(path: &Path) -> bool {
    if !path.exists() {
        return true;
    }
    if !path.is_dir() {
        return false;
    }
    match path.read_dir() {
        Err(_) => false,
        Ok(mut read_dir) => read_dir.next().is_none(),
    }
}