zola/components/utils/src/fs.rs

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Rust
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use std::io::prelude::*;
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use std::fs::{File, create_dir_all, read_dir, copy};
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use std::path::{Path, PathBuf};
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use walkdir::WalkDir;
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use errors::{Result, ResultExt};
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/// Create a file with the content given
pub fn create_file(path: &Path, content: &str) -> Result<()> {
let mut file = File::create(&path)?;
file.write_all(content.as_bytes())?;
Ok(())
}
/// Create a directory at the given path if it doesn't exist already
pub fn ensure_directory_exists(path: &Path) -> Result<()> {
if !path.exists() {
create_directory(path)?;
}
Ok(())
}
/// Very similar to `create_dir` from the std except it checks if the folder
/// exists before creating it
pub fn create_directory(path: &Path) -> Result<()> {
if !path.exists() {
create_dir_all(path)
.chain_err(|| format!("Was not able to create folder {}", path.display()))?;
}
Ok(())
}
/// Return the content of a file, with error handling added
pub fn read_file(path: &Path) -> Result<String> {
let mut content = String::new();
File::open(path)
.chain_err(|| format!("Failed to open '{:?}'", path.display()))?
.read_to_string(&mut content)?;
Ok(content)
}
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/// Looks into the current folder for the path and see if there's anything that is not a .md
/// file. Those will be copied next to the rendered .html file
pub fn find_related_assets(path: &Path) -> Vec<PathBuf> {
let mut assets = vec![];
for entry in read_dir(path).unwrap().filter_map(|e| e.ok()) {
let entry_path = entry.path();
if entry_path.is_file() {
match entry_path.extension() {
Some(e) => match e.to_str() {
Some("md") => continue,
_ => assets.push(entry_path.to_path_buf()),
},
None => continue,
}
}
}
assets
}
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/// Copy a file but takes into account where to start the copy as
/// there might be folders we need to create on the way
pub fn copy_file(src: &Path, dest: &PathBuf, base_path: &PathBuf) -> Result<()> {
let relative_path = src.strip_prefix(base_path).unwrap();
let target_path = dest.join(relative_path);
if let Some(parent_directory) = target_path.parent() {
create_dir_all(parent_directory)?;
}
copy(src, target_path)?;
Ok(())
}
pub fn copy_directory(src: &PathBuf, dest: &PathBuf) -> Result<()> {
for entry in WalkDir::new(src).into_iter().filter_map(|e| e.ok()) {
let relative_path = entry.path().strip_prefix(src).unwrap();
let target_path = dest.join(relative_path);
if entry.path().is_dir() {
if !target_path.exists() {
create_directory(&target_path)?;
}
} else {
copy_file(entry.path(), dest, src)?;
}
}
Ok(())
}
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#[cfg(test)]
mod tests {
use std::fs::File;
use tempdir::TempDir;
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use super::{find_related_assets};
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#[test]
fn can_find_related_assets() {
let tmp_dir = TempDir::new("example").expect("create temp dir");
File::create(tmp_dir.path().join("index.md")).unwrap();
File::create(tmp_dir.path().join("example.js")).unwrap();
File::create(tmp_dir.path().join("graph.jpg")).unwrap();
File::create(tmp_dir.path().join("fail.png")).unwrap();
let assets = find_related_assets(tmp_dir.path());
assert_eq!(assets.len(), 3);
assert_eq!(assets.iter().filter(|p| p.extension().unwrap() != "md").count(), 3);
assert_eq!(assets.iter().filter(|p| p.file_name().unwrap() == "example.js").count(), 1);
assert_eq!(assets.iter().filter(|p| p.file_name().unwrap() == "graph.jpg").count(), 1);
assert_eq!(assets.iter().filter(|p| p.file_name().unwrap() == "fail.png").count(), 1);
}
}