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65 lines
1.8 KiB
65 lines
1.8 KiB
use std::error::Error;
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use std::fmt;
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use std::fs::File as FsFile;
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use std::io;
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use std::io::{Read, Write};
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use std::ops::Deref;
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use std::path::Path;
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use symbols::Symbol;
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use resources::Resource;
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pub struct File<C, D> where C: Deref<Target=str>, D: AsRef<str> + fmt::Display {
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path: D,
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content: C
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}
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impl<C, D> File<C, D> where C: Deref<Target=str>, D: AsRef<str> + fmt::Display {
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pub fn new(path: D, content: C) -> Self {
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File {
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path: path,
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content: content
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}
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}
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}
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impl<C, D> Symbol for File<C, D> where C: Deref<Target=str>, D: AsRef<str> + fmt::Display {
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fn target_reached(&self) -> Result<bool, Box<Error>> {
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let file = FsFile::open(self.path.as_ref());
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// Check if file exists
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if let Err(e) = file {
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return if e.kind() == io::ErrorKind::NotFound {
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Ok(false)
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} else {
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Err(Box::new(e))
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};
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}
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// Check if content is the same
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let mut file_content = file.unwrap().bytes();
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let mut target_content = self.content.bytes();
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loop {
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match (file_content.next(), target_content.next()) {
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(None, None) => return Ok(true),
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(Some(Ok(a)), Some(b)) if a == b => {},
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(Some(Err(e)), _) => return Err(Box::new(e)),
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(_, _) => return Ok(false)
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}
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}
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}
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fn execute(&self) -> Result<(), Box<Error>> {
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let mut file = try!(FsFile::create(self.path.as_ref()));
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try!(file.write_all(self.content.as_bytes()));
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Ok(())
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}
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fn get_prerequisites(&self) -> Vec<Resource> {
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vec![ Resource::new("dir", Path::new(self.path.as_ref()).parent().unwrap().to_string_lossy() ) ]
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}
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}
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impl<C, D> fmt::Display for File<C, D> where C: Deref<Target=str>, D: AsRef<str> + fmt::Display {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error>{
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write!(f, "File {}", self.path)
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}
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}
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