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

#![forbid(unsafe_code)]

#[cfg(feature = "color")]
mod color;

use std::fmt::{self, Display, Formatter};
use std::io::{self, Write};
use std::path::{Path, PathBuf};

use chksum::{Digest, Error};
#[cfg(feature = "color")]
use colored::Colorize;
use exitcode::{IOERR as EXITCODE_IOERR, OK as EXITCODE_OK};

#[cfg(feature = "color")]
pub use crate::color::Color;

#[derive(Clone, Debug)]
pub enum Target {
    Path(PathBuf),
    Stdin,
}

impl Display for Target {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        match self {
            Self::Path(path) => write!(f, "{}", path.display()),
            Self::Stdin => write!(f, "<stdin>"),
        }
    }
}

impl<T> From<T> for Target
where
    T: AsRef<Path>,
{
    fn from(value: T) -> Self {
        let value = value.as_ref();
        Self::Path(value.to_path_buf())
    }
}

#[derive(Debug, clap::Parser)]
#[command(name = "chksum", version, about, long_about = None)]
pub struct Command {
    #[command(subcommand)]
    pub subcommand: Subcommand,
    /// Show colored output.
    #[arg(value_enum, short, long, default_value_t = Color::Auto, global = true)]
    #[cfg(feature = "color")]
    pub color: Color,
}

#[derive(Debug, clap::Subcommand)]
pub enum Subcommand {
    /// Calculate MD5 digest.
    #[cfg(feature = "md5")]
    #[command(arg_required_else_help = true)]
    MD5 {
        #[command(flatten)]
        args: Args,
        #[command(flatten)]
        options: Options,
    },
    /// Calculate SHA-1 digest.
    #[cfg(feature = "sha1")]
    #[command(arg_required_else_help = true)]
    SHA1 {
        #[command(flatten)]
        args: Args,
        #[command(flatten)]
        options: Options,
    },
    /// Calculate SHA-2 224 digest.
    #[cfg(feature = "sha2-224")]
    #[command(arg_required_else_help = true)]
    SHA2_224 {
        #[command(flatten)]
        args: Args,
        #[command(flatten)]
        options: Options,
    },
    /// Calculate SHA-2 256 digest.
    #[cfg(feature = "sha2-256")]
    #[command(arg_required_else_help = true)]
    SHA2_256 {
        #[command(flatten)]
        args: Args,
        #[command(flatten)]
        options: Options,
    },
    /// Calculate SHA-2 384 digest.
    #[cfg(feature = "sha2-384")]
    #[command(arg_required_else_help = true)]
    SHA2_384 {
        #[command(flatten)]
        args: Args,
        #[command(flatten)]
        options: Options,
    },
    /// Calculate SHA-2 512 digest.
    #[cfg(feature = "sha2-512")]
    #[command(arg_required_else_help = true)]
    SHA2_512 {
        #[command(flatten)]
        args: Args,
        #[command(flatten)]
        options: Options,
    },
}

#[derive(Debug, clap::Args)]
pub struct Args {
    /// Path to file or directory.
    #[arg(required = true, value_name = "PATH", conflicts_with = "stdin")]
    pub paths: Vec<PathBuf>,
}

#[derive(Debug, clap::Args)]
pub struct Options {
    /// Calculate digest from stdin.
    #[arg(short, long, default_value_t = false, conflicts_with = "paths")]
    pub stdin: bool,
}

/// Prints result to stdout or stderr.
pub fn print_result(
    stdout: &mut impl Write,
    stderr: &mut impl Write,
    target: Target,
    result: Result<impl Digest, Error>,
) -> io::Result<()> {
    match result {
        Ok(digest) => writeln!(stdout, "{target}: {digest}"),
        Err(error) => {
            let error = error.to_string().to_lowercase();
            let error = format!("{target}: {error}");
            #[cfg(feature = "color")]
            let error = error.red();
            writeln!(stderr, "{error}")
        },
    }
}

/// Turns result to exitcode.
pub fn exitcode<T>(result: &Result<T, Error>) -> i32
where
    T: Digest,
{
    if result.is_ok() {
        EXITCODE_OK
    } else {
        EXITCODE_IOERR
    }
}

#[cfg(test)]
mod tests {
    use anyhow::Result;
    use assert_fs::prelude::PathChild;
    use assert_fs::TempDir;
    use chksum::{chksum, MD5};

    use super::*;

    #[test]
    fn exitcode_ok() -> Result<()> {
        let tmpdir = TempDir::new()?;

        let result = chksum::<MD5>(tmpdir.path());
        assert_eq!(exitcode(&result), EXITCODE_OK);

        Ok(())
    }

    #[test]
    fn exitcode_error() -> Result<()> {
        let tmpdir = TempDir::new()?;
        let child = tmpdir.child("child");

        let result = chksum::<MD5>(child.path());
        assert_eq!(exitcode(&result), EXITCODE_IOERR);

        Ok(())
    }
}