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

#[macro_export]
// Let the user format the help and parse it from that string into arguments to create the unit test
macro_rules! cli_examples {
    ($( [ $($description:ident)* => $command:tt $args:expr $( => $output:expr )? ] )*) => {
            #[cfg(test)]
            mod cli_examples {
            use $crate::serial_test;
            $(
            $crate::paste::paste! {
                #[test]
                #[serial_test::serial]
                #[allow(unreachable_code)]
                fn [<$($description:lower _)*:snake example>] () {
                    let mut proc = std::process::Command::new("cargo");
                    proc.arg("run");
                    proc.arg("--bin");
                    proc.arg(if stringify!($command) == "forc" {
                        "forc".to_owned()
                    } else {
                        format!("forc-{}", stringify!($command))
                    });
                    proc.arg("--");

                    super::parse_args($args).into_iter().for_each(|arg| {
                        proc.arg(arg);
                    });

                    let path = std::path::Path::new("tests");
                    if path.is_dir() {
                        // a tests folder exists, move the cwd of the process to
                        // be executed there. In that folder all files needed to
                        // run the cmd should be stored
                        proc.current_dir(path);
                    }
                    let output = proc.output().expect(stringify!($command));

                    $(
                        let expected_output = $crate::Regex::new($output).expect("valid regex");
                        let stdout = String::from_utf8_lossy(&output.stdout);
                        let stderr = String::from_utf8_lossy(&output.stderr);

                        assert!(
                            expected_output.is_match(&stdout) ||
                            expected_output.is_match(&stderr),
                            "expected_output: {}\nStdOut:\n{}\nStdErr:\n{}\n",
                            expected_output,
                            stdout,
                            stderr,
                        );
                        return;
                    )?
                    // We don't know what to get or how to parse the output, all
                    // we care is to get a valid exit code
                    assert!(output.status.success(), "{}: {:?}", stringify!($($description)*), output);
                }
            }
            )*
        }

        #[cfg(test)]
        fn parse_args(input: &str) -> Vec<String> {
            let mut chars = input.chars().peekable().into_iter();
            let mut args = vec![];

            loop {
                let character = if let Some(c) = chars.next() { c } else { break };

                match character {
                    ' ' | '\\' | '\t' | '\n' => loop {
                        match chars.peek() {
                            Some(' ') | Some('\t') | Some('\n') => chars.next(),
                            _ => break,
                        };
                    },
                    '=' => {
                        args.push("=".to_string());
                    }
                    '"' | '\'' => {
                        let end_character = character;
                        let mut current_word = String::new();
                        loop {
                            match chars.peek() {
                                Some(character) => {
                                    if *character == end_character {
                                        let _ = chars.next();
                                        args.push(current_word);
                                        break;
                                    } else if *character == '\\' {
                                        let _ = chars.next();
                                        if let Some(character) = chars.next() {
                                            current_word.push(character);
                                        }
                                    } else {
                                        current_word.push(*character);
                                        chars.next();
                                    }
                                }
                                None => {
                                    break;
                                }
                            }
                        }
                    }
                    character => {
                        let mut current_word = character.to_string();
                        loop {
                            match chars.peek() {
                                Some(' ') | Some('\t') | Some('\n') | Some('=') | Some('\'')
                                | Some('"') | None => {
                                    args.push(current_word);
                                    break;
                                }
                                Some(character) => {
                                    current_word.push(*character);
                                    chars.next();
                                }
                            }
                        }
                    }
                }
            }

            args
        }

        fn help() -> &'static str {
            Box::leak(format!("EXAMPLES:\n{}", examples()).into_boxed_str())
        }

        pub fn examples() -> &'static str {
            Box::leak( [
            $(
            $crate::paste::paste! {
                if stringify!($command) == "forc" {
                    format!("  #{}\n  forc {}\n\n", stringify!($($description)*), $args )
                } else {
                    format!("  #{}\n  forc {} {}\n\n", stringify!($($description)*), stringify!($command), $args )
                }
            },
            )*
            ].concat().into_boxed_str())
        }
    }
}