mirror of https://github.com/sharkdp/bat.git
83 lines
2.7 KiB
Rust
83 lines
2.7 KiB
Rust
use std::fs::File;
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use std::path::Path;
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use std::time::SystemTime;
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use clap::crate_version;
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use semver::Version;
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use serde::{Deserialize, Serialize};
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use crate::errors::*;
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#[derive(Debug, PartialEq, Default, Serialize, Deserialize)]
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pub struct AssetsMetadata {
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bat_version: Option<String>,
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creation_time: Option<SystemTime>,
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}
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const FILENAME: &'static str = "metadata.yaml";
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impl AssetsMetadata {
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pub(crate) fn new() -> AssetsMetadata {
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AssetsMetadata {
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bat_version: Some(crate_version!().into()),
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creation_time: Some(SystemTime::now()),
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}
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}
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pub(crate) fn save_to_folder(&self, path: &Path) -> Result<()> {
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let file = File::create(path.join(FILENAME))?;
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serde_yaml::to_writer(file, self)?;
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Ok(())
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}
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fn try_load_from_folder(path: &Path) -> Result<Self> {
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let file = File::open(path.join(FILENAME))?;
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Ok(serde_yaml::from_reader(file)?)
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}
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/// Load metadata about the stored cache file from the given folder.
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///
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/// There are several possibilities:
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/// - We find a metadata.yaml file and are able to parse it
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/// => return the contained information
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/// - We find a metadata.yaml file and but are not able to parse it
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/// => return a SerdeYamlError
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/// - We do not find a metadata.yaml file but a syntaxes.bin or themes.bin file
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/// => assume that these were created by an old version of bat and return
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/// AssetsMetadata::default() without version information
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/// - We do not find a metadata.yaml file and no cached assets
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/// => no user provided assets are available, return None
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pub fn load_from_folder(path: &Path) -> Result<Option<Self>> {
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match Self::try_load_from_folder(path) {
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Ok(metadata) => Ok(Some(metadata)),
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Err(e) => match e.kind() {
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ErrorKind::SerdeYamlError(_) => Err(e),
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_ => {
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if path.join("syntaxes.bin").exists() || path.join("themes.bin").exists() {
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Ok(Some(Self::default()))
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} else {
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Ok(None)
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}
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}
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},
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}
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}
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pub fn is_compatible(&self) -> bool {
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let current_version =
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Version::parse(crate_version!()).expect("bat follows semantic versioning");
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let stored_version = self
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.bat_version
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.as_ref()
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.and_then(|ver| Version::parse(ver).ok());
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if let Some(stored_version) = stored_version {
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current_version.major == stored_version.major
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&& current_version.minor == stored_version.minor
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} else {
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false
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}
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}
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}
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