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

use crate::deps::{DependencyConfig, SystemDependency};
use crate::env::*;
use crate::error::Error;
use crate::pm::*;
use crate::pm_vendor::*;

/// Represents the current system, including architecture, operating system,
/// and package manager information.
pub struct System {
    /// Platform architecture.
    pub arch: SystemArch,

    /// Package manager.
    pub manager: SystemPackageManager,

    /// Operating system.
    pub os: SystemOS,
}

impl System {
    /// Create a new instance and detect system information.
    pub fn new() -> Result<Self, Error> {
        Ok(System::with_manager(SystemPackageManager::detect()?))
    }

    /// Create a new instance with the provided package manager.
    pub fn with_manager(manager: SystemPackageManager) -> Self {
        System {
            arch: SystemArch::from_env(),
            manager,
            os: SystemOS::from_env(),
        }
    }

    /// Return the command and arguments to "install a package" for the
    /// current package manager. Will replace `$` in an argument with the
    /// dependency name, derived from [`DependencyName`].
    pub fn get_install_package_command(
        &self,
        dep_config: &DependencyConfig,
        interactive: bool,
    ) -> Result<Vec<String>, Error> {
        let os = dep_config.os.unwrap_or(self.os);
        let pm = dep_config.manager.unwrap_or(self.manager);
        let pm_config = pm.get_config();
        let mut args = vec![];

        for arg in pm_config
            .commands
            .get(&CommandType::InstallPackage)
            .cloned()
            .unwrap()
        {
            if arg == "$" {
                for dep in dep_config.get_package_names(&os, &pm)? {
                    if let Some(ver) = &dep_config.version {
                        match &pm_config.version_arg {
                            VersionArgument::None => {
                                args.push(dep);
                            }
                            VersionArgument::Inline(op) => {
                                args.push(format!("{dep}{op}{ver}"));
                            }
                            VersionArgument::Separate(opt) => {
                                args.push(dep);
                                args.push(opt.to_owned());
                                args.push(ver.to_owned());
                            }
                        };
                    } else {
                        args.push(dep);
                    }
                }
            } else {
                args.push(arg);
            }
        }

        self.append_interactive(
            CommandType::InstallPackage,
            &pm_config,
            &mut args,
            interactive,
        );

        Ok(args)
    }

    /// Return the command and arguments to "update the registry index"
    /// for the current package manager.
    pub fn get_update_index_command(&self, interactive: bool) -> Option<Vec<String>> {
        let pm_config = self.manager.get_config();

        if let Some(args) = pm_config.commands.get(&CommandType::UpdateIndex) {
            let mut args = args.to_owned();

            self.append_interactive(CommandType::UpdateIndex, &pm_config, &mut args, interactive);

            return Some(args);
        }

        None
    }

    /// Resolve and reduce the dependencies to a list that's applicable
    /// to the current system.
    pub fn resolve_dependencies(&self, deps: Vec<SystemDependency>) -> Vec<DependencyConfig> {
        let mut configs = vec![];

        for dep in deps {
            let config = dep.to_config();

            if config.os.as_ref().is_some_and(|o| o != &self.os) {
                continue;
            }

            if config.arch.as_ref().is_some_and(|a| a != &self.arch) {
                continue;
            }

            configs.push(config);
        }

        configs
    }

    fn append_interactive(
        &self,
        command: CommandType,
        config: &PackageManagerConfig,
        args: &mut Vec<String>,
        interactive: bool,
    ) {
        if config.prompt_for.contains(&command) {
            match &config.prompt_arg {
                PromptArgument::None => {}
                PromptArgument::Interactive(i) => {
                    if interactive {
                        args.push(i.to_owned());
                    }
                }
                PromptArgument::Skip(y) => {
                    if !interactive {
                        args.push(y.to_owned());
                    }
                }
            };
        }
    }
}