schematics/src/symbols/not_a_symlink.rs

use std::error::Error;
use std::fmt;
use std::fs;
use std::io;

use symbols::Symbol;

pub struct NotASymlink<D> where D: AsRef<str> + fmt::Display {
  path: D
}

impl<D> NotASymlink<D> where D: AsRef<str> + fmt::Display {
  pub fn new(path: D) -> Self {
    NotASymlink {
      path: path
    }
  }
}

impl<D> Symbol for NotASymlink<D> where D: AsRef<str> + fmt::Display {
  fn target_reached(&self) -> Result<bool, Box<Error>> {
    let metadata = fs::symlink_metadata(self.path.as_ref());
    // Check if file exists
    if let Err(e) = metadata {
      return if e.kind() == io::ErrorKind::NotFound {
        Ok(true)
      } else {
        Err(Box::new(e))
      };
    }
    Ok(!metadata.unwrap().file_type().is_symlink())
  }

  fn execute(&self) -> Result<(), Box<Error>> {
    try!(fs::remove_file(self.path.as_ref()));
    Ok(())
  }
}

impl<D> fmt::Display for NotASymlink<D> where D: AsRef<str> + fmt::Display {
  fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error>{
    write!(f, "NotASymlink {}", self.path)
  }
}