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use std::io::{Error, Read, Write};
#[derive(Debug)]
pub struct ShellScript {
pub interpreter: String,
pub comments: Vec<String>,
pub commands: Vec<String>,
}
impl ShellScript {
pub fn write<T: Write>(&self, f: &mut T) -> Result<usize, Error> {
let mut bytes_written = 0;
bytes_written += f.write(format!("{}\n", self.interpreter).as_bytes())?;
bytes_written += f.write(self.comments.join("\n").as_bytes())?;
bytes_written += f.write(&"\n".as_bytes())?;
bytes_written += f.write(self.commands.join("\n").as_bytes())?;
bytes_written += f.write(&"\n".as_bytes())?;
Ok(bytes_written)
}
}
#[test]
fn test_parse() {
let shell_script = r#"
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
exit 0
"#
.as_bytes();
let mut c = ::std::io::Cursor::new(&shell_script);
let result = parse(&mut c).unwrap();
println!("Result: {:?}", result);
let mut buff: Vec<u8> = Vec::new();
let result2 = result.write(&mut buff).unwrap();
}
pub fn parse<T: Read>(f: &mut T) -> Result<ShellScript, Error> {
let mut comments: Vec<String> = Vec::new();
let mut commands: Vec<String> = Vec::new();
let mut interpreter = String::new();
let mut buf = String::new();
f.read_to_string(&mut buf)?;
for line in buf.lines() {
let trimmed = line.trim();
if trimmed.starts_with("#!") {
interpreter = trimmed.to_string();
} else if trimmed.starts_with("#") {
comments.push(trimmed.to_string());
} else {
if !trimmed.is_empty() {
commands.push(trimmed.to_string());
}
}
}
Ok(ShellScript {
interpreter: interpreter,
comments: comments,
commands: commands,
})
}