rust_version_info_file/
lib.rs

1#![allow(clippy::needless_doctest_main)]
2/*!
3output rust version info into a file
4
5This crate is the presents, the file output of rustc --version and cargo tree command.
6
7# Features
8
9- minimum support rustc 1.58.1 (db9d1b20b 2022-01-20)
10
11# Examples
12
13Please write the following code in the build.rs:
14
15```rust
16use rust_version_info_file::rust_version_info_file;
17
18fn main() {
19    rust_version_info_file("target/rust-version-info.txt", "Cargo.toml");
20}
21```
22
23And you get the file as result it.
24
25```text
26cat target/rust-version-info-file.txt
27```
28
29# On debian package
30
31In Cargo.toml
32
33```text
34[package.metadata.deb]
35assets = [
36    ["target/rust-version-info.txt", "usr/share/doc/your_package/", "644"],
37    ["README.md", "usr/share/doc/your_package/", "644"],
38]
39```
40
41# Output sample
42
43```text
44$ cat target/rust-version-info-aki-gsub.txt
45```
46
47```text
48rustc 1.61.0 (fe5b13d68 2022-05-18)
49aki-gsub v0.1.34
50├── anyhow v1.0.57
51├── atty v0.2.14
52│   └── libc v0.2.126
53├── flood-tide v0.2.4
54├── memx-cdy v0.1.7
55│   ├── libc v0.2.126
56│   └── memx v0.1.20
57│       [build-dependencies]
58│       └── rustc_version v0.4.0
59│           └── semver v1.0.10
60├── regex v1.5.6
61│   ├── aho-corasick v0.7.18
62│   │   └── memchr v2.5.0
63│   ├── memchr v2.5.0
64│   └── regex-syntax v0.6.26
65└── runnel v0.3.10
66    [build-dependencies]
67    └── rustc_version v0.4.0 (*)
68[build-dependencies]
69├── rust-version-info-file v0.1.5
70└── rustc_version v0.4.0 (*)
71[dev-dependencies]
72├── exec-target v0.2.6
73└── indoc v1.0.6 (proc-macro)
74```
75*/
76use std::fs::OpenOptions;
77use std::io::{Read, Write};
78use std::path::Path;
79
80/// output rust version info into a file
81pub fn rust_version_info_file<T: AsRef<Path>>(dst: T, cargo_toml_file: &str) {
82    let dst_path: &Path = dst.as_ref();
83    let old_s = read_file(dst_path);
84    let curr_s = format!(
85        "{}\n{}\n",
86        rustc_version_info(),
87        tree_version_info(cargo_toml_file),
88    );
89    if old_s != curr_s {
90        let mut fo = match OpenOptions::new()
91            .create(true)
92            .write(true)
93            .truncate(true)
94            .open(dst_path)
95        {
96            Ok(fo) => fo,
97            Err(_) => return,
98        };
99        let _ = fo.write_fmt(format_args!("{curr_s}"));
100        let _ = fo.flush();
101    }
102}
103
104fn read_file(path: &Path) -> String {
105    match OpenOptions::new().create(false).read(true).open(path) {
106        Ok(mut fi) => {
107            let mut s = String::new();
108            let _ = fi.read_to_string(&mut s);
109            s
110        }
111        Err(_) => String::new(),
112    }
113}
114
115fn rustc_version_info() -> String {
116    let cmd = std::env::var_os("RUSTC").unwrap_or_else(|| std::ffi::OsString::from("rustc"));
117    let out = std::process::Command::new(cmd)
118        .arg("--version")
119        .output()
120        .unwrap();
121    let v = out.stdout;
122    let v_len = v.len();
123    let v = if v_len > 0 && v[v_len - 1] == b'\n' {
124        &v[0..v_len - 1]
125    } else {
126        &v[0..v_len]
127    };
128    String::from_utf8(v.to_vec()).unwrap()
129}
130
131fn tree_version_info(cargo_toml_file: &str) -> String {
132    let cmd = "cargo";
133    let out = std::process::Command::new(cmd)
134        .arg("tree")
135        .arg("--manifest-path")
136        .arg(cargo_toml_file)
137        .output()
138        .unwrap();
139    let v = out.stdout;
140    let v_len = v.len();
141    let v = if v_len > 0 && v[v_len - 1] == b'\n' {
142        &v[0..v_len - 1]
143    } else {
144        &v[0..v_len]
145    };
146    //
147    let string = String::from_utf8(v.to_vec()).unwrap();
148    //
149    let string = match string.find(" (") {
150        Some(pos1) => {
151            let (s1, s2) = string.split_at(pos1);
152            match s2.find(')') {
153                Some(pos2) => {
154                    let (_s2, s3) = s2.split_at(pos2 + 1);
155                    s1.to_owned() + s3
156                }
157                None => string,
158            }
159        }
160        None => string,
161    };
162    //
163    string
164}
rust_version_info_file/lib.rs

rust_version_info_file/
lib.rs
