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mirror of https://github.com/Llewellynvdm/starship.git synced 2024-10-31 18:52:29 +00:00
starship/src/utils.rs

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Rust
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use std::fs::File;
use std::io::{Read, Result};
use std::path::Path;
use std::process::Command;
use crate::context::Shell;
/// Return the string contents of a file
pub fn read_file<P: AsRef<Path>>(file_name: P) -> Result<String> {
let mut file = File::open(file_name)?;
let mut data = String::new();
file.read_to_string(&mut data)?;
Ok(data)
}
#[derive(Debug)]
pub struct CommandOutput {
pub stdout: String,
pub stderr: String,
}
impl PartialEq for CommandOutput {
fn eq(&self, other: &Self) -> bool {
self.stdout == other.stdout && self.stderr == other.stderr
}
}
/// Execute a command and return the output on stdout and stderr if sucessful
#[cfg(not(test))]
pub fn exec_cmd(cmd: &str, args: &[&str]) -> Option<CommandOutput> {
internal_exec_cmd(&cmd, &args)
}
#[cfg(test)]
pub fn exec_cmd(cmd: &str, args: &[&str]) -> Option<CommandOutput> {
let command = match args.len() {
0 => String::from(cmd),
_ => format!("{} {}", cmd, args.join(" ")),
};
match command.as_str() {
"crystal --version" => Some(CommandOutput {
stdout: String::from("Crystal 0.32.1 (2019-12-18)"),
stderr: String::default(),
}),
"dummy_command" => Some(CommandOutput {
stdout: String::from("stdout ok!"),
stderr: String::from("stderr ok!"),
}),
"elm --version" => Some(CommandOutput {
stdout: String::from("0.19.1"),
stderr: String::default(),
}),
"go version" => Some(CommandOutput {
stdout: String::from("go version go1.12.1 linux/amd64"),
stderr: String::default(),
}),
"node --version" => Some(CommandOutput {
stdout: String::from("v12.0.0"),
stderr: String::default(),
}),
"php -r echo PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION.'.'.PHP_RELEASE_VERSION;" => {
Some(CommandOutput {
stdout: String::from("7.3.8"),
stderr: String::default(),
})
}
"ruby -v" => Some(CommandOutput {
stdout: String::from("ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux-gnu]"),
stderr: String::default(),
}),
"stack ghc -- --numeric-version --no-install-ghc" => Some(CommandOutput {
stdout: String::from("8.6.5"),
stderr: String::default(),
}),
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"elixir --version" => Some(CommandOutput {
stdout: String::from(
"\
Erlang/OTP 22 [erts-10.6.4] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]
Elixir 1.10 (compiled with Erlang/OTP 22)",
),
stderr: String::default(),
}),
// If we don't have a mocked command fall back to executing the command
_ => internal_exec_cmd(&cmd, &args),
}
}
/// Wraps ANSI color escape sequences in the shell-appropriate wrappers.
pub fn wrap_colorseq_for_shell(ansi: String, shell: Shell) -> String {
const ESCAPE_BEGIN: char = '\u{1b}';
const ESCAPE_END: char = 'm';
wrap_seq_for_shell(ansi, shell, ESCAPE_BEGIN, ESCAPE_END)
}
/// Many shells cannot deal with raw unprintable characters and miscompute the cursor position,
/// leading to strange visual bugs like duplicated/missing chars. This function wraps a specified
/// sequence in shell-specific escapes to avoid these problems.
pub fn wrap_seq_for_shell(
ansi: String,
shell: Shell,
escape_begin: char,
escape_end: char,
) -> String {
const BASH_BEG: &str = "\u{5c}\u{5b}"; // \[
const BASH_END: &str = "\u{5c}\u{5d}"; // \]
const ZSH_BEG: &str = "\u{25}\u{7b}"; // %{
const ZSH_END: &str = "\u{25}\u{7d}"; // %}
// ANSI escape codes cannot be nested, so we can keep track of whether we're
// in an escape or not with a single boolean variable
let mut escaped = false;
let final_string: String = ansi
.chars()
.map(|x| {
if x == escape_begin && !escaped {
escaped = true;
match shell {
Shell::Bash => format!("{}{}", BASH_BEG, escape_begin),
Shell::Zsh => format!("{}{}", ZSH_BEG, escape_begin),
_ => x.to_string(),
}
} else if x == escape_end && escaped {
escaped = false;
match shell {
Shell::Bash => format!("{}{}", escape_end, BASH_END),
Shell::Zsh => format!("{}{}", escape_end, ZSH_END),
_ => x.to_string(),
}
} else {
x.to_string()
}
})
.collect();
final_string
}
fn internal_exec_cmd(cmd: &str, args: &[&str]) -> Option<CommandOutput> {
log::trace!("Executing command '{:?}' with args '{:?}'", cmd, args);
match Command::new(cmd).args(args).output() {
Ok(output) => {
let stdout_string = String::from_utf8(output.stdout).unwrap();
let stderr_string = String::from_utf8(output.stderr).unwrap();
if !output.status.success() {
log::trace!("Non-zero exit code '{:?}'", output.status.code());
log::trace!("stdout: {}", stdout_string);
log::trace!("stderr: {}", stderr_string);
return None;
}
Some(CommandOutput {
stdout: stdout_string,
stderr: stderr_string,
})
}
Err(error) => {
log::trace!("Executing command {:?} failed by: {:?}", cmd, error);
None
}
}
}
#[cfg(test)]
#[cfg(not(windows))] // While the exec_cmd should work on Windows these tests assume a Unix-like environment.
mod tests {
use super::*;
#[test]
fn exec_mocked_command() {
let result = exec_cmd("dummy_command", &[]);
let expected = Some(CommandOutput {
stdout: String::from("stdout ok!"),
stderr: String::from("stderr ok!"),
});
assert_eq!(result, expected)
}
#[test]
fn exec_no_output() {
let result = internal_exec_cmd("true", &[]);
let expected = Some(CommandOutput {
stdout: String::from(""),
stderr: String::from(""),
});
assert_eq!(result, expected)
}
#[test]
fn exec_with_output_stdout() {
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let result = internal_exec_cmd("/bin/sh", &["-c", "echo hello"]);
let expected = Some(CommandOutput {
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stdout: String::from("hello\n"),
stderr: String::from(""),
});
assert_eq!(result, expected)
}
#[test]
fn exec_with_output_stderr() {
let result = internal_exec_cmd("/bin/sh", &["-c", "echo hello >&2"]);
let expected = Some(CommandOutput {
stdout: String::from(""),
stderr: String::from("hello\n"),
});
assert_eq!(result, expected)
}
#[test]
fn exec_with_output_both() {
let result = internal_exec_cmd("/bin/sh", &["-c", "echo hello; echo world >&2"]);
let expected = Some(CommandOutput {
stdout: String::from("hello\n"),
stderr: String::from("world\n"),
});
assert_eq!(result, expected)
}
#[test]
fn exec_with_non_zero_exit_code() {
let result = internal_exec_cmd("false", &[]);
let expected = None;
assert_eq!(result, expected)
}
#[test]
fn test_color_sequence_wrappers() {
let test0 = "\x1b2mhellomynamekeyes\x1b2m"; // BEGIN: \x1b END: m
let test1 = "\x1b]330;mlol\x1b]0m"; // BEGIN: \x1b END: m
let test2 = "\u{1b}J"; // BEGIN: \x1b END: J
let test3 = "OH NO"; // BEGIN: O END: O
let test4 = "herpaderp";
let test5 = "";
let zresult0 = wrap_seq_for_shell(test0.to_string(), Shell::Zsh, '\x1b', 'm');
let zresult1 = wrap_seq_for_shell(test1.to_string(), Shell::Zsh, '\x1b', 'm');
let zresult2 = wrap_seq_for_shell(test2.to_string(), Shell::Zsh, '\x1b', 'J');
let zresult3 = wrap_seq_for_shell(test3.to_string(), Shell::Zsh, 'O', 'O');
let zresult4 = wrap_seq_for_shell(test4.to_string(), Shell::Zsh, '\x1b', 'm');
let zresult5 = wrap_seq_for_shell(test5.to_string(), Shell::Zsh, '\x1b', 'm');
assert_eq!(&zresult0, "%{\x1b2m%}hellomynamekeyes%{\x1b2m%}");
assert_eq!(&zresult1, "%{\x1b]330;m%}lol%{\x1b]0m%}");
assert_eq!(&zresult2, "%{\x1bJ%}");
assert_eq!(&zresult3, "%{OH NO%}");
assert_eq!(&zresult4, "herpaderp");
assert_eq!(&zresult5, "");
let bresult0 = wrap_seq_for_shell(test0.to_string(), Shell::Bash, '\x1b', 'm');
let bresult1 = wrap_seq_for_shell(test1.to_string(), Shell::Bash, '\x1b', 'm');
let bresult2 = wrap_seq_for_shell(test2.to_string(), Shell::Bash, '\x1b', 'J');
let bresult3 = wrap_seq_for_shell(test3.to_string(), Shell::Bash, 'O', 'O');
let bresult4 = wrap_seq_for_shell(test4.to_string(), Shell::Bash, '\x1b', 'm');
let bresult5 = wrap_seq_for_shell(test5.to_string(), Shell::Bash, '\x1b', 'm');
assert_eq!(&bresult0, "\\[\x1b2m\\]hellomynamekeyes\\[\x1b2m\\]");
assert_eq!(&bresult1, "\\[\x1b]330;m\\]lol\\[\x1b]0m\\]");
assert_eq!(&bresult2, "\\[\x1bJ\\]");
assert_eq!(&bresult3, "\\[OH NO\\]");
assert_eq!(&bresult4, "herpaderp");
assert_eq!(&bresult5, "");
}
}