Move vault_contents out of Context and into Exporter
This reduces the need to pass vault_contents around in various places and restricts Context to dealing with the actual note which is being processed, instead of also carrying program state information. This will help with future feature development as note parsing functions can now access Exporter directly.
This commit is contained in:
Nick Groenen
parent
e9d5e69e24
commit
207ca1124e
450
src/lib.rs
450
src/lib.rs
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@ -84,36 +84,35 @@ pub struct Exporter<'a> {
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root: PathBuf,
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destination: PathBuf,
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frontmatter_strategy: FrontmatterStrategy,
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vault_contents: Option<Vec<PathBuf>>,
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walk_options: WalkOptions<'a>,
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}
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#[derive(Debug, Clone)]
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/// Context holds parser metadata for the file/note currently being parsed.
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struct Context<'a> {
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struct Context {
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file_tree: Vec<PathBuf>,
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vault_contents: &'a [PathBuf],
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frontmatter_strategy: FrontmatterStrategy,
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}
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impl<'a> Context<'a> {
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impl Context {
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/// Create a new `Context`
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fn new(file: PathBuf, vault_contents: &'a [PathBuf]) -> Context<'a> {
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fn new(file: PathBuf) -> Context {
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Context {
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file_tree: vec![file.clone()],
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vault_contents,
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frontmatter_strategy: FrontmatterStrategy::Auto,
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}
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}
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/// Create a new `Context` which inherits from a parent Context.
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fn from_parent(context: &Context<'a>, child: &PathBuf) -> Context<'a> {
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fn from_parent(context: &Context, child: &PathBuf) -> Context {
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let mut context = context.clone();
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context.file_tree.push(child.to_path_buf());
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context
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}
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/// Associate a new `FrontmatterStrategy` with this context.
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fn set_frontmatter_strategy(&mut self, strategy: FrontmatterStrategy) -> &mut Context<'a> {
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fn set_frontmatter_strategy(&mut self, strategy: FrontmatterStrategy) -> &mut Context {
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self.frontmatter_strategy = strategy;
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self
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}
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@ -146,6 +145,7 @@ impl<'a> Exporter<'a> {
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destination,
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frontmatter_strategy: FrontmatterStrategy::Auto,
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walk_options: WalkOptions::default(),
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vault_contents: None,
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}
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}
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@ -159,15 +159,18 @@ impl<'a> Exporter<'a> {
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self
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}
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pub fn run(self) -> Result<()> {
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pub fn run(&mut self) -> Result<()> {
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if !self.root.exists() {
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return Err(ExportError::PathDoesNotExist { path: self.root });
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return Err(ExportError::PathDoesNotExist {
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path: self.root.clone(),
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});
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}
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// When a single file is specified, we can short-circuit contruction of walk and associated
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// directory traversal. This also allows us to accept destination as either a file or a
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// directory name.
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if self.root.is_file() {
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self.vault_contents = Some(vec![self.root.clone()]);
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let source_filename = self
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.root
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.file_name()
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@ -188,265 +191,278 @@ impl<'a> Exporter<'a> {
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self.destination.clone()
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}
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};
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return Ok(self.export_note(&self.root, &destination, &[self.root.clone()])?);
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return Ok(self.export_note(&self.root, &destination)?);
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}
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if !self.destination.exists() {
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return Err(ExportError::PathDoesNotExist {
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path: self.destination,
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path: self.destination.clone(),
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});
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}
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let vault = vault_contents(self.root.as_path(), self.walk_options.clone())?;
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vault.clone().into_par_iter().try_for_each(|file| {
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let relative_path = file
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.strip_prefix(&self.root.clone())
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.expect("file should always be nested under root")
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.to_path_buf();
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let destination = &self.destination.join(&relative_path);
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self.export_note(&file, destination, &vault)
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})?;
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self.vault_contents = Some(vault_contents(
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self.root.as_path(),
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self.walk_options.clone(),
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)?);
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self.vault_contents
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.as_ref()
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.unwrap()
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.clone()
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.into_par_iter()
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.try_for_each(|file| {
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let relative_path = file
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.strip_prefix(&self.root.clone())
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.expect("file should always be nested under root")
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.to_path_buf();
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let destination = &self.destination.join(&relative_path);
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self.export_note(&file, destination)
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})?;
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Ok(())
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}
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fn export_note(&self, src: &Path, dest: &Path, vault_contents: &[PathBuf]) -> Result<()> {
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fn export_note(&self, src: &Path, dest: &Path) -> Result<()> {
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match is_markdown_file(src) {
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true => {
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parse_and_export_obsidian_note(src, dest, vault_contents, self.frontmatter_strategy)
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}
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true => self.parse_and_export_obsidian_note(src, dest, self.frontmatter_strategy),
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false => copy_file(src, dest),
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}
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.context(FileExportError { path: src })
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}
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}
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fn parse_and_export_obsidian_note(
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src: &Path,
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dest: &Path,
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vault_contents: &[PathBuf],
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frontmatter_strategy: FrontmatterStrategy,
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) -> Result<()> {
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let content = fs::read_to_string(&src).context(ReadError { path: src })?;
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fn parse_and_export_obsidian_note(
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&self,
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src: &Path,
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dest: &Path,
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frontmatter_strategy: FrontmatterStrategy,
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) -> Result<()> {
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let content = fs::read_to_string(&src).context(ReadError { path: src })?;
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let (mut frontmatter, _content) =
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matter::matter(&content).unwrap_or(("".to_string(), content.to_string()));
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frontmatter = frontmatter.trim().to_string();
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//let mut outfile = create_file(&dest).context(FileIOError { filename: dest })?;
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let mut outfile = create_file(&dest)?;
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let (mut frontmatter, _content) =
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matter::matter(&content).unwrap_or(("".to_string(), content.to_string()));
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frontmatter = frontmatter.trim().to_string();
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//let mut outfile = create_file(&dest).context(FileIOError { filename: dest })?;
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let mut outfile = create_file(&dest)?;
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let write_frontmatter = match frontmatter_strategy {
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FrontmatterStrategy::Always => true,
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FrontmatterStrategy::Never => false,
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FrontmatterStrategy::Auto => frontmatter != "",
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};
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if write_frontmatter {
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if frontmatter != "" && !frontmatter.ends_with('\n') {
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frontmatter.push('\n');
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let write_frontmatter = match frontmatter_strategy {
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FrontmatterStrategy::Always => true,
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FrontmatterStrategy::Never => false,
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FrontmatterStrategy::Auto => frontmatter != "",
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};
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if write_frontmatter {
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if frontmatter != "" && !frontmatter.ends_with('\n') {
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frontmatter.push('\n');
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}
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outfile
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.write_all(format!("---\n{}---\n\n", frontmatter).as_bytes())
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.context(WriteError { path: &dest })?;
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}
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let mut context = Context::new(src.to_path_buf());
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context.set_frontmatter_strategy(frontmatter_strategy);
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let markdown_tree = self.parse_obsidian_note(&src, &context)?;
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outfile
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.write_all(format!("---\n{}---\n\n", frontmatter).as_bytes())
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.write_all(render_mdtree_to_mdtext(markdown_tree).as_bytes())
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.context(WriteError { path: &dest })?;
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Ok(())
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}
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let mut context = Context::new(src.to_path_buf(), vault_contents);
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context.set_frontmatter_strategy(frontmatter_strategy);
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let markdown_tree = parse_obsidian_note(&src, &context)?;
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outfile
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.write_all(render_mdtree_to_mdtext(markdown_tree).as_bytes())
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.context(WriteError { path: &dest })?;
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Ok(())
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}
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fn parse_obsidian_note<'b>(&self, path: &Path, context: &Context) -> Result<MarkdownTree<'b>> {
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if context.note_depth() > NOTE_RECURSION_LIMIT {
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return Err(ExportError::RecursionLimitExceeded {
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file_tree: context.file_tree(),
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});
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}
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let content = fs::read_to_string(&path).context(ReadError { path })?;
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let (_frontmatter, content) =
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matter::matter(&content).unwrap_or(("".to_string(), content.to_string()));
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fn parse_obsidian_note<'a>(path: &Path, context: &Context) -> Result<MarkdownTree<'a>> {
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if context.note_depth() > NOTE_RECURSION_LIMIT {
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return Err(ExportError::RecursionLimitExceeded {
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file_tree: context.file_tree(),
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});
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}
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let content = fs::read_to_string(&path).context(ReadError { path })?;
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let (_frontmatter, content) =
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matter::matter(&content).unwrap_or(("".to_string(), content.to_string()));
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let mut parser_options = Options::empty();
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parser_options.insert(Options::ENABLE_TABLES);
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parser_options.insert(Options::ENABLE_FOOTNOTES);
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parser_options.insert(Options::ENABLE_STRIKETHROUGH);
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parser_options.insert(Options::ENABLE_TASKLISTS);
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let mut parser_options = Options::empty();
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parser_options.insert(Options::ENABLE_TABLES);
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parser_options.insert(Options::ENABLE_FOOTNOTES);
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parser_options.insert(Options::ENABLE_STRIKETHROUGH);
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parser_options.insert(Options::ENABLE_TASKLISTS);
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// Use of ENABLE_SMART_PUNCTUATION causes character replacements which breaks up the single
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// Event::Text element that is emitted between `[[` and `]]` into an unpredictable number of
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// additional elements. This completely throws off the current parsing strategy and is
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// unsupported. If a user were to want this, a strategy would be to do a second-stage pass over
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// the rewritten markdown just before feeding to pulldown_cmark_to_cmark.
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//parser_options.insert(Options::ENABLE_SMART_PUNCTUATION);
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// Use of ENABLE_SMART_PUNCTUATION causes character replacements which breaks up the single
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// Event::Text element that is emitted between `[[` and `]]` into an unpredictable number of
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// additional elements. This completely throws off the current parsing strategy and is
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// unsupported. If a user were to want this, a strategy would be to do a second-stage pass over
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// the rewritten markdown just before feeding to pulldown_cmark_to_cmark.
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//parser_options.insert(Options::ENABLE_SMART_PUNCTUATION);
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let mut parser = Parser::new_ext(&content, parser_options);
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let mut tree = vec![];
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let mut buffer = Vec::with_capacity(5);
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let mut parser = Parser::new_ext(&content, parser_options);
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let mut tree = vec![];
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let mut buffer = Vec::with_capacity(5);
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while let Some(event) = parser.next() {
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match event {
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Event::Text(CowStr::Borrowed("[")) | Event::Text(CowStr::Borrowed("![")) => {
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buffer.push(event);
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// A lone '[' or a '![' Text event signifies the possible start of a linked or
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// embedded note. However, we cannot be sure unless it's also followed by another
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// '[', the note reference itself and closed by a double ']'. To determine whether
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// that's the case, we need to read ahead so we can backtrack later if needed.
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for _ in 1..5 {
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if let Some(event) = parser.next() {
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buffer.push(event);
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while let Some(event) = parser.next() {
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match event {
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Event::Text(CowStr::Borrowed("[")) | Event::Text(CowStr::Borrowed("![")) => {
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buffer.push(event);
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// A lone '[' or a '![' Text event signifies the possible start of a linked or
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// embedded note. However, we cannot be sure unless it's also followed by another
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// '[', the note reference itself and closed by a double ']'. To determine whether
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// that's the case, we need to read ahead so we can backtrack later if needed.
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for _ in 1..5 {
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if let Some(event) = parser.next() {
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buffer.push(event);
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}
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}
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}
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if buffer.len() != 5
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if buffer.len() != 5
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// buffer[0] has '[' or '![', but we already know this
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|| buffer[1] != Event::Text(CowStr::Borrowed("["))
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|| buffer[3] != Event::Text(CowStr::Borrowed("]"))
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|| buffer[4] != Event::Text(CowStr::Borrowed("]"))
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{
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tree.append(&mut buffer);
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buffer.clear();
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continue;
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}
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{
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tree.append(&mut buffer);
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buffer.clear();
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continue;
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}
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if let Event::Text(CowStr::Borrowed(text)) = buffer[2] {
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match buffer[0] {
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Event::Text(CowStr::Borrowed("[")) => {
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let mut link_events = obsidian_note_link_to_markdown(&text, context);
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tree.append(&mut link_events);
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buffer.clear();
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continue;
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if let Event::Text(CowStr::Borrowed(text)) = buffer[2] {
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match buffer[0] {
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Event::Text(CowStr::Borrowed("[")) => {
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let mut link_events =
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self.obsidian_note_link_to_markdown(&text, context);
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tree.append(&mut link_events);
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buffer.clear();
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continue;
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}
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Event::Text(CowStr::Borrowed("![")) => {
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let mut elements = self.embed_file(&text, &context)?;
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tree.append(&mut elements);
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buffer.clear();
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continue;
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}
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// This arm can never be reached due to the outer match against event, but
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// the compiler (currently) cannot infer this.
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_ => {}
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}
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Event::Text(CowStr::Borrowed("![")) => {
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let mut elements = embed_file(&text, &context)?;
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tree.append(&mut elements);
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buffer.clear();
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continue;
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}
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// This arm can never be reached due to the outer match against event, but
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// the compiler (currently) cannot infer this.
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_ => {}
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}
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}
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_ => tree.push(event),
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}
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if !buffer.is_empty() {
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tree.append(&mut buffer);
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buffer.clear();
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}
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_ => tree.push(event),
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}
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if !buffer.is_empty() {
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tree.append(&mut buffer);
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buffer.clear();
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}
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tree.append(&mut buffer);
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Ok(tree.into_iter().map(event_to_owned).collect())
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}
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tree.append(&mut buffer);
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Ok(tree.into_iter().map(event_to_owned).collect())
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}
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// Generate markdown elements for a file that is embedded within another note.
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//
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// - If the file being embedded is a note, it's content is included at the point of embed.
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// - If the file is an image, an image tag is generated.
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// - For other types of file, a regular link is created instead.
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fn embed_file<'a, 'b>(note_name: &'a str, context: &'b Context) -> Result<MarkdownTree<'a>> {
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// TODO: If a #section is specified, reduce returned MarkdownTree to just
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// that section.
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let note_name = note_name.split('#').collect::<Vec<&str>>()[0];
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// Generate markdown elements for a file that is embedded within another note.
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//
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// - If the file being embedded is a note, it's content is included at the point of embed.
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// - If the file is an image, an image tag is generated.
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// - For other types of file, a regular link is created instead.
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fn embed_file<'b>(&self, note_name: &'a str, context: &'a Context) -> Result<MarkdownTree<'a>> {
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// TODO: If a #section is specified, reduce returned MarkdownTree to just
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// that section.
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let note_name = note_name.split('#').collect::<Vec<&str>>()[0];
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let tree = match lookup_filename_in_vault(note_name, context.vault_contents) {
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Some(path) => {
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let context = Context::from_parent(context, path);
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let no_ext = OsString::new();
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match path.extension().unwrap_or(&no_ext).to_str() {
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Some("md") => parse_obsidian_note(&path, &context)?,
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Some("png") | Some("jpg") | Some("jpeg") | Some("gif") | Some("webp") => {
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make_link_to_file(¬e_name, ¬e_name, &context)
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.into_iter()
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.map(|event| match event {
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// make_link_to_file returns a link to a file. With this we turn the link
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// into an image reference instead. Slightly hacky, but avoids needing
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// to keep another utility function around for this, or introducing an
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// extra parameter on make_link_to_file.
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Event::Start(Tag::Link(linktype, cowstr1, cowstr2)) => {
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Event::Start(Tag::Image(
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linktype,
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CowStr::from(cowstr1.into_string()),
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CowStr::from(cowstr2.into_string()),
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))
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}
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Event::End(Tag::Link(linktype, cowstr1, cowstr2)) => {
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Event::End(Tag::Image(
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linktype,
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CowStr::from(cowstr1.into_string()),
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CowStr::from(cowstr2.into_string()),
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))
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}
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_ => event,
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})
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.collect()
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let tree = match lookup_filename_in_vault(note_name, &self.vault_contents.as_ref().unwrap())
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{
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Some(path) => {
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let context = Context::from_parent(context, path);
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let no_ext = OsString::new();
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match path.extension().unwrap_or(&no_ext).to_str() {
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Some("md") => self.parse_obsidian_note(&path, &context)?,
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Some("png") | Some("jpg") | Some("jpeg") | Some("gif") | Some("webp") => {
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self.make_link_to_file(¬e_name, ¬e_name, &context)
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.into_iter()
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.map(|event| match event {
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// make_link_to_file returns a link to a file. With this we turn the link
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// into an image reference instead. Slightly hacky, but avoids needing
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// to keep another utility function around for this, or introducing an
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// extra parameter on make_link_to_file.
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Event::Start(Tag::Link(linktype, cowstr1, cowstr2)) => {
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Event::Start(Tag::Image(
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linktype,
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CowStr::from(cowstr1.into_string()),
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CowStr::from(cowstr2.into_string()),
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))
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}
|
||||
Event::End(Tag::Link(linktype, cowstr1, cowstr2)) => {
|
||||
Event::End(Tag::Image(
|
||||
linktype,
|
||||
CowStr::from(cowstr1.into_string()),
|
||||
CowStr::from(cowstr2.into_string()),
|
||||
))
|
||||
}
|
||||
_ => event,
|
||||
})
|
||||
.collect()
|
||||
}
|
||||
_ => self.make_link_to_file(¬e_name, ¬e_name, &context),
|
||||
}
|
||||
_ => make_link_to_file(¬e_name, ¬e_name, &context),
|
||||
}
|
||||
}
|
||||
None => {
|
||||
None => {
|
||||
// TODO: Extract into configurable function.
|
||||
println!(
|
||||
"Warning: Unable to find embedded note\n\tReference: '{}'\n\tSource: '{}'\n",
|
||||
note_name,
|
||||
context.current_file().display(),
|
||||
);
|
||||
vec![]
|
||||
}
|
||||
};
|
||||
Ok(tree)
|
||||
}
|
||||
|
||||
fn obsidian_note_link_to_markdown(&self, content: &'a str, context: &Context) -> MarkdownTree {
|
||||
let captures = OBSIDIAN_NOTE_LINK_RE
|
||||
.captures(&content)
|
||||
.expect("note link regex didn't match - bad input?");
|
||||
let notename = captures
|
||||
.name("file")
|
||||
.expect("Obsidian links should always reference a file");
|
||||
let label = captures.name("label").unwrap_or(notename);
|
||||
|
||||
self.make_link_to_file(notename.as_str(), label.as_str(), context)
|
||||
}
|
||||
|
||||
fn make_link_to_file<'b>(
|
||||
&self,
|
||||
file: &'b str,
|
||||
label: &'b str,
|
||||
context: &Context,
|
||||
) -> MarkdownTree<'b> {
|
||||
let target_file = lookup_filename_in_vault(file, &self.vault_contents.as_ref().unwrap());
|
||||
if target_file.is_none() {
|
||||
// TODO: Extract into configurable function.
|
||||
println!(
|
||||
"Warning: Unable to find embedded note\n\tReference: '{}'\n\tSource: '{}'\n",
|
||||
note_name,
|
||||
"Warning: Unable to find referenced note\n\tReference: '{}'\n\tSource: '{}'\n",
|
||||
file,
|
||||
context.current_file().display(),
|
||||
);
|
||||
vec![]
|
||||
return vec![
|
||||
Event::Start(Tag::Emphasis),
|
||||
Event::Text(CowStr::from(String::from(label))),
|
||||
Event::End(Tag::Emphasis),
|
||||
];
|
||||
}
|
||||
};
|
||||
Ok(tree)
|
||||
}
|
||||
let target_file = target_file.unwrap();
|
||||
let rel_link = diff_paths(
|
||||
target_file,
|
||||
&context
|
||||
.current_file()
|
||||
.parent()
|
||||
.expect("obsidian content files should always have a parent"),
|
||||
)
|
||||
.expect("should be able to build relative path when target file is found in vault");
|
||||
let rel_link = rel_link.to_string_lossy();
|
||||
let encoded_link = utf8_percent_encode(&rel_link, PERCENTENCODE_CHARS);
|
||||
|
||||
fn obsidian_note_link_to_markdown<'a>(content: &'a str, context: &Context) -> MarkdownTree<'a> {
|
||||
let captures = OBSIDIAN_NOTE_LINK_RE
|
||||
.captures(&content)
|
||||
.expect("note link regex didn't match - bad input?");
|
||||
let notename = captures
|
||||
.name("file")
|
||||
.expect("Obsidian links should always reference a file");
|
||||
let label = captures.name("label").unwrap_or(notename);
|
||||
|
||||
make_link_to_file(notename.as_str(), label.as_str(), context)
|
||||
}
|
||||
|
||||
fn make_link_to_file<'a>(file: &'a str, label: &'a str, context: &Context) -> MarkdownTree<'a> {
|
||||
let target_file = lookup_filename_in_vault(file, context.vault_contents);
|
||||
if target_file.is_none() {
|
||||
// TODO: Extract into configurable function.
|
||||
println!(
|
||||
"Warning: Unable to find referenced note\n\tReference: '{}'\n\tSource: '{}'\n",
|
||||
file,
|
||||
context.current_file().display(),
|
||||
let link = pulldown_cmark::Tag::Link(
|
||||
pulldown_cmark::LinkType::Inline,
|
||||
CowStr::from(encoded_link.to_string()),
|
||||
CowStr::from(""),
|
||||
);
|
||||
return vec![
|
||||
Event::Start(Tag::Emphasis),
|
||||
Event::Text(CowStr::from(String::from(label))),
|
||||
Event::End(Tag::Emphasis),
|
||||
];
|
||||
|
||||
vec![
|
||||
Event::Start(link.clone()),
|
||||
Event::Text(CowStr::from(label)),
|
||||
Event::End(link.clone()),
|
||||
]
|
||||
}
|
||||
let target_file = target_file.unwrap();
|
||||
let rel_link = diff_paths(
|
||||
target_file,
|
||||
&context
|
||||
.current_file()
|
||||
.parent()
|
||||
.expect("obsidian content files should always have a parent"),
|
||||
)
|
||||
.expect("should be able to build relative path when target file is found in vault");
|
||||
let rel_link = rel_link.to_string_lossy();
|
||||
let encoded_link = utf8_percent_encode(&rel_link, PERCENTENCODE_CHARS);
|
||||
|
||||
let link = pulldown_cmark::Tag::Link(
|
||||
pulldown_cmark::LinkType::Inline,
|
||||
CowStr::from(encoded_link.to_string()),
|
||||
CowStr::from(""),
|
||||
);
|
||||
|
||||
vec![
|
||||
Event::Start(link.clone()),
|
||||
Event::Text(CowStr::from(label)),
|
||||
Event::End(link.clone()),
|
||||
]
|
||||
}
|
||||
|
||||
fn lookup_filename_in_vault<'a>(
|
||||
|
|
|
|||
Loading…
Reference in New Issue