aboutsummaryrefslogtreecommitdiff
path: root/src/makefile/command_line.rs
blob: 6a45c180f3ede581fa86e5de908604befdb5a456 (plain)
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::env;
use std::fmt;
use std::process::{Command, ExitStatus};

use eyre::{bail, Error};
#[cfg(feature = "full")]
use lazy_static::lazy_static;
#[cfg(feature = "full")]
use regex::Regex;

#[cfg(feature = "full")]
use super::r#macro::Set as MacroSet;
use super::target::Target;
use super::token::{Token, TokenString};
use super::Makefile;

// inspired by python's subprocess module
fn execute_command_line(
    command_line: &str,
    ignore_errors: bool,
    #[cfg(feature = "full")] macros: &MacroSet,
) -> Result<ExitStatus, Error> {
    let (program, args) = if cfg!(windows) {
        let cmd = env::var("COMSPEC").unwrap_or_else(|_| "cmd.exe".into());
        let args = vec!["/c", command_line];
        (cmd, args)
    } else {
        let sh = env::var("SHELL").unwrap_or_else(|_| "/bin/sh".into());
        let args = if ignore_errors {
            vec!["-c", command_line]
        } else {
            vec!["-e", "-c", command_line]
        };
        (sh, args)
    };
    let mut command = Command::new(program);
    command.args(args);
    #[cfg(feature = "full")]
    command.envs(macros.resolve_exports()?);
    Ok(command.status()?)
}

#[derive(PartialEq, Eq, Clone, Debug)]
pub struct CommandLine {
    /// If the command prefix contains a <hyphen-minus>, or the -i option is present, or
    /// the special target .IGNORE has either the current target as a prerequisite or has
    /// no prerequisites, any error found while executing the command shall be ignored.
    ignore_errors: bool,
    /// If the command prefix contains an at-sign and the make utility command line -n
    /// option is not specified, or the -s option is present, or the special target
    /// .SILENT has either the current target as a prerequisite or has no prerequisites,
    /// the command shall not be written to standard output before it is executed.
    silent: bool,
    /// If the command prefix contains a <plus-sign>, this indicates a makefile command
    /// line that shall be executed even if -n, -q, or -t is specified.
    always_execute: bool,
    execution_line: TokenString,
}

impl CommandLine {
    pub fn from(mut line: TokenString) -> Self {
        let mut ignore_errors = false;
        let mut silent = false;
        let mut always_execute = false;

        if let Token::Text(text) = line.first_token_mut() {
            let mut text_chars = text.chars().peekable();
            while let Some(x) = text_chars.next_if(|x| matches!(x, '-' | '@' | '+')) {
                match x {
                    '-' => ignore_errors = true,
                    '@' => silent = true,
                    '+' => always_execute = true,
                    _ => unreachable!(),
                }
            }
            *text = text_chars.collect();
        }

        Self {
            ignore_errors,
            silent,
            always_execute,
            execution_line: line,
        }
    }

    pub fn execute(&self, file: &Makefile, target: &Target) -> eyre::Result<()> {
        let is_recursive = self.execution_line.tokens().any(|x| match x {
            Token::MacroExpansion { name, .. } => name == "MAKE",
            _ => false,
        });
        log::trace!("executing {}", &self.execution_line);
        let execution_line = file.expand_macros(&self.execution_line, Some(target))?;
        #[cfg(feature = "full")]
        {
            let is_just_one_macro_expansion = self.execution_line.tokens().count() == 1
                && self.execution_line.tokens().all(|x| match x {
                    Token::MacroExpansion { .. } => true,
                    Token::FunctionCall { .. } => true,
                    _ => false,
                });
            // unfortunately, if we had a multiline macro somewhere with non-escaped newlines, now we have to run each of them as separate lines
            lazy_static! {
                static ref UNESCAPED_NEWLINE: Regex = Regex::new(r"([^\\])\n").unwrap();
            }
            if is_just_one_macro_expansion && UNESCAPED_NEWLINE.is_match(&execution_line) {
                let lines = UNESCAPED_NEWLINE
                    .split(&execution_line)
                    .map(|x| Self::from(TokenString::text(x.trim_start())));
                for line in lines {
                    line.execute(file, target)?;
                }
                return Ok(());
            }
        }
        log::trace!("executing {}", &execution_line);
        let mut self_ignore_errors = self.ignore_errors;
        let mut self_silent = self.silent;
        let mut self_always_execute = self.always_execute;

        // apparently some makefiles will just throw this shit in in macros? bruh moment tbh
        let execution_line: String = {
            let mut line_chars = execution_line.chars().peekable();
            while let Some(x) = line_chars.next_if(|x| matches!(x, '-' | '@' | '+')) {
                match x {
                    '-' => self_ignore_errors = true,
                    '@' => self_silent = true,
                    '+' => self_always_execute = true,
                    _ => unreachable!(),
                }
            }
            line_chars.collect()
        };

        let ignore_error = self_ignore_errors
            || file.args.ignore_errors
            || file.special_target_has_prereq(".IGNORE", &target.name);
        let silent = (self_silent && !file.args.dry_run)
            || file.args.silent
            || file.special_target_has_prereq(".SILENT", &target.name);

        if !silent {
            println!("{}", execution_line);
        }

        let should_execute = self_always_execute
            || is_recursive
            || !(file.args.dry_run || file.args.question || file.args.touch);
        if !should_execute {
            return Ok(());
        }

        let return_value = execute_command_line(
            &execution_line,
            ignore_error,
            #[cfg(feature = "full")]
            &file.macros,
        );
        let errored = return_value.map_or(true, |status| !status.success());
        if errored {
            // apparently there was an error. do we care?
            if !ignore_error {
                bail!("error from command execution!");
            }
        }

        Ok(())
    }
}

impl fmt::Display for CommandLine {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        if self.ignore_errors {
            write!(f, "-")?;
        }
        if self.silent {
            write!(f, "@")?;
        }
        if self.always_execute {
            write!(f, "+")?;
        }
        let execution_line = format!("{}", &self.execution_line);
        let execution_line = execution_line.replace("\n", "↵\n");
        write!(f, "{}", execution_line)?;
        Ok(())
    }
}