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
use inflector::Inflector;
use std::ffi::{OsStr, OsString};
use std::fs;
use std::fs::File;
use std::io::Write;
use std::ops::Add;
use std::path::{Path, PathBuf};
use walkdir::WalkDir;

pub trait StringExt {
    /// Converts a string slice into an escaped `String`
    fn escaped_snake_case(&self) -> String;
}

impl StringExt for &str {
    fn escaped_snake_case(&self) -> String {
        // TODO: currently non-text, non-numeric tokens are ignored and whitespace is converted to
        //  underscores. More complicated escaping can be done to preserve more tokens
        //  (e.g. punctuation)
        self.to_snake_case()
    }
}

/// Returns a file name with prefix prepended and 'rs' as the extension
pub fn to_full_file_name(prefix: &str, ion_file: &Path) -> String {
    let ion_file = ion_file
        .file_stem()
        .unwrap()
        .to_str()
        .unwrap()
        .escaped_snake_case()
        .add(".rs");
    format!("{}_{}", prefix, ion_file)
}

/// Returns a vector of all .ion files in the directory `dir`
pub fn all_ion_files_in(dir: &str) -> walkdir::Result<Vec<PathBuf>> {
    let ion_file_extension = OsStr::new("ion");
    WalkDir::new(dir)
        .into_iter()
        .filter_map(|result| match result {
            Ok(entry) => {
                if entry.path().extension() == Some(ion_file_extension) {
                    Some(Ok(entry.into_path()))
                } else {
                    None
                }
            }
            Err(e) => Some(Err(e)),
        })
        .collect()
}

/// Creates a `mod.rs` file for the given `dir` with all the subdirectories and file names in the
/// directory. Also recursively generates `mod.rs` files for all of `dir`'s subdirectories. Requires
/// `dir` to be a directory.
pub fn dir_to_mods(dir: &Path) {
    assert!(dir.is_dir());
    let mut modules_in_dir: Vec<OsString> = Vec::new();
    for entry in fs::read_dir(dir).expect("read dir") {
        let entry = entry.expect("dir entry");
        let entry_file_type = entry.file_type().expect("file type");

        if entry_file_type.is_file() {
            let file_name = entry.file_name();
            if file_name == "mod.rs" {
                continue;
            }
        }

        modules_in_dir.push(entry.path().file_stem().expect("file stem").to_os_string());

        if entry_file_type.is_dir() {
            dir_to_mods(&entry.path())
        }
    }
    let mod_rs_path = dir.join(Path::new("mod.rs"));
    let mut mod_rs_file = File::create(mod_rs_path).expect("mod.rs create failed");
    for module in modules_in_dir {
        mod_rs_file
            .write_all(format!("mod {};\n", module.to_str().expect("to str")).as_bytes())
            .expect("Failure when writing to file");
    }
}

#[cfg(test)]
mod test {
    use crate::util::StringExt;

    #[test]
    fn escaping_letters_and_whitespace() {
        assert_eq!("a B c \t D \n e_f_G".escaped_snake_case(), "a_b_c_d_e_f_g")
    }

    #[test]
    fn escaping_letters_numbers_other_chars() {
        assert_eq!(
            "a B c  1 2 3 e f G !?#$%*!(".escaped_snake_case(),
            "a_b_c_1_2_3_e_f_g"
        )
    }
}