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|
use std::env;
use std::error::Error;
use std::fs;
use std::io;
use std::path::PathBuf;
use crate::file::{
format::ALL_EXTENSIONS, source::FileSourceResult, FileSource, FileStoredFormat, Format,
};
/// Describes a file sourced from a file
#[derive(Clone, Debug)]
pub struct FileSourceFile {
/// Path of configuration file
name: PathBuf,
}
impl FileSourceFile {
pub fn new(name: PathBuf) -> FileSourceFile {
FileSourceFile { name }
}
fn find_file<F>(
&self,
format_hint: Option<F>,
) -> Result<(PathBuf, Box<dyn Format>), Box<dyn Error + Send + Sync>>
where
F: FileStoredFormat + Format + 'static,
{
let mut filename = if self.name.is_absolute() {
self.name.clone()
} else {
env::current_dir()?.as_path().join(&self.name)
};
// First check for an _exact_ match
if filename.is_file() {
return if let Some(format) = format_hint {
Ok((filename, Box::new(format)))
} else {
for (format, extensions) in ALL_EXTENSIONS.iter() {
if extensions.contains(
&filename
.extension()
.unwrap_or_default()
.to_string_lossy()
.as_ref(),
) {
return Ok((filename, Box::new(*format)));
}
}
Err(Box::new(io::Error::new(
io::ErrorKind::NotFound,
format!(
"configuration file \"{}\" is not of a registered file format",
filename.to_string_lossy()
),
)))
};
}
match format_hint {
Some(format) => {
for ext in format.file_extensions() {
filename.set_extension(ext);
if filename.is_file() {
return Ok((filename, Box::new(format)));
}
}
}
None => {
for format in ALL_EXTENSIONS.keys() {
for ext in format.extensions() {
filename.set_extension(ext);
if filename.is_file() {
return Ok((filename, Box::new(*format)));
}
}
}
}
}
Err(Box::new(io::Error::new(
io::ErrorKind::NotFound,
format!(
"configuration file \"{}\" not found",
self.name.to_string_lossy()
),
)))
}
}
impl<F> FileSource<F> for FileSourceFile
where
F: Format + FileStoredFormat + 'static,
{
fn resolve(
&self,
format_hint: Option<F>,
) -> Result<FileSourceResult, Box<dyn Error + Send + Sync>> {
// Find file
let (filename, format) = self.find_file(format_hint)?;
// Attempt to use a relative path for the URI
let uri = env::current_dir()
.ok()
.and_then(|base| pathdiff::diff_paths(&filename, base))
.unwrap_or_else(|| filename.clone());
// Read contents from file
let text = fs::read_to_string(filename)?;
Ok(FileSourceResult {
uri: Some(uri.to_string_lossy().into_owned()),
content: text,
format,
})
}
}
|
