Merge branch 'render_images'

default_environment/templates/html/ast_node.dust

@@ -32,7 +32,8 @@
   {@eq value="code"}{>code/}{/eq}
   {@eq value="verbatim"}{>verbatim/}{/eq}
   {@eq value="plain_text"}{>plain_text/}{/eq}
-  {@eq value="regular_link"}{>regular_link/}{/eq}
+  {@eq value="regular_link_anchor"}{>regular_link_anchor/}{/eq}
+  {@eq value="regular_link_image"}{>regular_link_image/}{/eq}
   {@eq value="radio_link"}{>radio_link/}{/eq}
   {@eq value="radio_target"}{>radio_target/}{/eq}
   {@eq value="plain_link"}{>plain_link/}{/eq}

default_environment/templates/html/object.dust

@@ -6,7 +6,8 @@
   {@eq value="code"}{>code/}{/eq}
   {@eq value="verbatim"}{>verbatim/}{/eq}
   {@eq value="plain_text"}{>plain_text/}{/eq}
-  {@eq value="regular_link"}{>regular_link/}{/eq}
+  {@eq value="regular_link_anchor"}{>regular_link_anchor/}{/eq}
+  {@eq value="regular_link_image"}{>regular_link_image/}{/eq}
   {@eq value="radio_link"}{>radio_link/}{/eq}
   {@eq value="radio_target"}{>radio_target/}{/eq}
   {@eq value="plain_link"}{>plain_link/}{/eq}

default_environment/templates/html/regular_link_image.dust

@@ -0,0 +1 @@
+<img src="{.src}" alt="{.alt}" />

org_test_documents/regular_link/image_links.org

@@ -0,0 +1,22 @@
+[[file:image.svg]]
+
+[[file:/image.svg]]
+
+[[file:./image.svg]]
+
+[[/image.svg]]
+
+[[./image.svg]]
+
+# Check capitalization of extension
+[[./image.SVG]]
+
+# Check spaces in path
+[[./image and stuff.SVG]]
+
+[[/ssh:admin@test.example:important/file.svg]]
+
+[[file:/ssh:admin@test.example:important/file.svg]]
+
+# Check multiple parts in the path
+[[file:/foo/bar/baz/image.svg]]

rust-toolchain.toml

@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly"
+profile = "default"
+components = ["clippy", "rustfmt"]

src/command/build/render.rs

@@ -7,6 +7,7 @@ use tokio::fs::DirEntry;
 use tokio::task::JoinHandle;
 
 use crate::config::Config;
+use crate::context::DependencyManager;
 use crate::context::RenderBlogPostPage;
 use crate::context::RenderBlogPostPageInput;
 use crate::context::RenderBlogStream;
@@ -85,19 +86,27 @@ impl SiteRenderer {
 
         for page in &self.pages {
             let output_path = self.output_directory.join(page.get_output_path());
+            let dependency_manager =
+                std::sync::Arc::new(std::sync::Mutex::new(DependencyManager::new()));
             let render_context = RenderContext::new(
                 config,
                 self.output_directory.as_path(),
                 output_path.as_path(),
                 None,
+                dependency_manager.clone(),
             )?;
-            let render_context = RenderPage::new(render_context, page)?;
-            let rendered_output = renderer_integration.render(render_context)?;
+            let dust_context = RenderPage::new(render_context.clone(), page)?;
+            let rendered_output = renderer_integration.render(dust_context)?;
             let parent_directory = output_path
                 .parent()
                 .ok_or("Output file should have a containing directory.")?;
             tokio::fs::create_dir_all(parent_directory).await?;
-            tokio::fs::write(output_path, rendered_output).await?;
+            tokio::fs::write(&output_path, rendered_output).await?;
+
+            let dependencies = dependency_manager.lock().unwrap().take_dependencies();
+            for dependency in dependencies {
+                dependency.perform(render_context.clone()).await?;
+            }
         }
 
         Ok(())
@@ -113,20 +122,28 @@ impl SiteRenderer {
                     .join(config.get_relative_path_to_post(&blog_post.id))
                     .join(blog_post_page.get_output_path());
 
+                let dependency_manager =
+                    std::sync::Arc::new(std::sync::Mutex::new(DependencyManager::new()));
                 let convert_input = RenderBlogPostPageInput::new(blog_post, blog_post_page);
                 let render_context = RenderContext::new(
                     config,
                     self.output_directory.as_path(),
                     output_path.as_path(),
                     None,
+                    dependency_manager.clone(),
                 )?;
-                let render_context = RenderBlogPostPage::new(render_context, &convert_input)?;
-                let rendered_output = renderer_integration.render(render_context)?;
+                let dust_context = RenderBlogPostPage::new(render_context.clone(), &convert_input)?;
+                let rendered_output = renderer_integration.render(dust_context)?;
                 let parent_directory = output_path
                     .parent()
                     .ok_or("Output file should have a containing directory.")?;
                 tokio::fs::create_dir_all(parent_directory).await?;
-                tokio::fs::write(output_path, rendered_output).await?;
+                tokio::fs::write(&output_path, rendered_output).await?;
+
+                let dependencies = dependency_manager.lock().unwrap().take_dependencies();
+                for dependency in dependencies {
+                    dependency.perform(render_context.clone()).await?;
+                }
             }
         }
 
@@ -194,14 +211,17 @@ impl SiteRenderer {
                 )?)
             };
 
+            let dependency_manager =
+                std::sync::Arc::new(std::sync::Mutex::new(DependencyManager::new()));
             let convert_input = RenderBlogStreamInput::new(chunk, older_link, newer_link);
             let render_context = RenderContext::new(
                 config,
                 self.output_directory.as_path(),
                 output_file.as_path(),
                 None,
+                dependency_manager.clone(),
             )?;
-            let blog_stream = RenderBlogStream::new(render_context, &convert_input)?;
+            let blog_stream = RenderBlogStream::new(render_context.clone(), &convert_input)?;
 
             // Pass each RenderBlogStream to dust as the context to render index.html and any additional stream pages.
             let rendered_output = renderer_integration.render(blog_stream)?;
@@ -209,7 +229,12 @@ impl SiteRenderer {
                 .parent()
                 .ok_or("Output file should have a containing directory.")?;
             tokio::fs::create_dir_all(parent_directory).await?;
-            tokio::fs::write(output_file, rendered_output).await?;
+            tokio::fs::write(&output_file, rendered_output).await?;
+
+            let dependencies = dependency_manager.lock().unwrap().take_dependencies();
+            for dependency in dependencies {
+                dependency.perform(render_context.clone()).await?;
+            }
         }
         Ok(())
     }

src/command/build/runner.rs

@@ -163,7 +163,7 @@ async fn load_pages(config: &Config) -> Result<Vec<IPage>, CustomError> {
             ret.push(
                 IPage::new(
                     intermediate_context,
-                    PageInput::new(relative_to_pages_dir_path, parsed_document),
+                    PageInput::new(relative_to_pages_dir_path, real_path, parsed_document),
                 )
                 .await?,
             );

src/context/blog_post_page.rs

@@ -1,6 +1,7 @@
 use serde::Serialize;
 
 use super::render_context::RenderContext;
+use crate::context::macros::push_file;
 use crate::error::CustomError;
 use crate::intermediate::get_web_path;
 use crate::intermediate::BlogPost;
@@ -49,6 +50,7 @@ render!(
     original,
     render_context,
     {
+        push_file!(render_context, &original.page.src, {
             let css_files = vec![
                 get_web_path(
                     render_context.config,
@@ -69,7 +71,8 @@ render!(
                 render_context.output_file,
                 "blog_post.js",
             )?];
-        let global_settings = GlobalSettings::new(original.page.title.clone(), css_files, js_files);
+            let global_settings =
+                GlobalSettings::new(original.page.title.clone(), css_files, js_files);
             let page_header = PageHeader::new(
                 render_context.config.get_site_title().map(str::to_string),
                 Some(get_web_path(
@@ -120,5 +123,6 @@ render!(
                 footnotes,
             };
             Ok(ret)
+        })
     }
 );

src/context/blog_stream.rs

@@ -2,6 +2,7 @@ use serde::Serialize;
 
 use super::macros::render;
 use super::render_context::RenderContext;
+use crate::context::macros::push_file;
 use crate::context::RenderDocumentElement;
 use crate::context::RenderRealFootnoteDefinition;
 use crate::error::CustomError;
@@ -164,6 +165,7 @@ render!(
             .get_index_page()
             .ok_or_else(|| format!("Blog post {} needs an index page.", original.original.id))?;
 
+        push_file!(render_context, &index_page.src, {
             let title = index_page.title.clone();
 
             let children = index_page
@@ -191,6 +193,7 @@ render!(
                 children,
                 footnotes,
             })
+        })
     }
 );
 

src/context/dependency.rs

@@ -0,0 +1,45 @@
+use std::path::PathBuf;
+
+use crate::error::CustomError;
+
+use super::RenderContext;
+
+#[derive(Debug)]
+pub(crate) enum Dependency {
+    StaticFile { absolute_path: PathBuf },
+}
+
+impl Dependency {
+    pub(crate) async fn perform(
+        &self,
+        render_context: RenderContext<'_>,
+    ) -> Result<(), CustomError> {
+        match self {
+            Dependency::StaticFile { absolute_path } => {
+                let input_root_directory = render_context.config.get_root_directory();
+                let relative_path_to_file = absolute_path.strip_prefix(input_root_directory)?;
+                let path_to_output = render_context
+                    .output_root_directory
+                    .join(relative_path_to_file);
+                tokio::fs::create_dir_all(
+                    path_to_output
+                        .parent()
+                        .ok_or("Output file should have a containing directory.")?,
+                )
+                .await?;
+
+                if tokio::fs::metadata(&path_to_output).await.is_ok() {
+                    // TODO: compare hash and error out if they do not match.
+                    println!(
+                        "Not copying {} to {} because the output file already exists.",
+                        absolute_path.display(),
+                        path_to_output.display()
+                    );
+                } else {
+                    tokio::fs::copy(absolute_path, path_to_output).await?;
+                }
+                Ok(())
+            }
+        }
+    }
+}

src/context/dependency_manager.rs

@@ -0,0 +1,68 @@
+use std::path::Path;
+use std::path::PathBuf;
+
+use crate::error::CustomError;
+
+use super::dependency::Dependency;
+
+pub(crate) type RefDependencyManager = std::sync::Arc<std::sync::Mutex<DependencyManager>>;
+
+#[derive(Debug)]
+pub(crate) struct DependencyManager {
+    /// A stack of paths for the files being visited.
+    ///
+    /// The last entry is the current file being processed. This can be used for handling relative-path links.
+    file_stack: Vec<PathBuf>,
+
+    dependencies: Vec<Dependency>,
+}
+
+impl DependencyManager {
+    pub(crate) fn new() -> Self {
+        DependencyManager {
+            file_stack: Vec::new(),
+            dependencies: Vec::new(),
+        }
+    }
+
+    pub(crate) fn push_file<P>(&mut self, path: P) -> Result<(), CustomError>
+    where
+        P: Into<PathBuf>,
+    {
+        self.file_stack.push(path.into());
+        Ok(())
+    }
+
+    pub(crate) fn pop_file(&mut self) -> Result<(), CustomError> {
+        self.file_stack
+            .pop()
+            .expect("Popped more files off the dependency manager file stack than exist.");
+        Ok(())
+    }
+
+    pub(crate) fn get_current_folder(&self) -> Result<&Path, CustomError> {
+        Ok(self
+            .file_stack
+            .last()
+            .ok_or("No current file")?
+            .parent()
+            .ok_or("Current file was not in a directory")?)
+    }
+
+    pub(crate) fn mark_file_for_copying<P>(&mut self, path: P) -> Result<(), CustomError>
+    where
+        P: Into<PathBuf>,
+    {
+        self.dependencies.push(Dependency::StaticFile {
+            absolute_path: path.into(),
+        });
+        Ok(())
+    }
+
+    /// Return the dependencies and forget about them.
+    pub(crate) fn take_dependencies(&mut self) -> Vec<Dependency> {
+        let mut dependencies = Vec::new();
+        std::mem::swap(&mut self.dependencies, &mut dependencies);
+        dependencies
+    }
+}

src/context/macros.rs

@@ -35,3 +35,23 @@ macro_rules! rnoop {
 }
 
 pub(crate) use rnoop;
+
+/// Push a file onto the render DependencyManager's file stack while inside the code block.
+macro_rules! push_file {
+    ($render_context:ident, $path:expr, $body:tt) => {{
+        $render_context
+            .dependency_manager
+            .lock()
+            .unwrap()
+            .push_file($path)?;
+        let ret = (|| $body)();
+        $render_context
+            .dependency_manager
+            .lock()
+            .unwrap()
+            .pop_file()?;
+        ret
+    }};
+}
+
+pub(crate) use push_file;

src/context/mod.rs

@@ -11,6 +11,8 @@ mod clock;
 mod code;
 mod comment;
 mod comment_block;
+mod dependency;
+mod dependency_manager;
 mod diary_sexp;
 mod document_element;
 mod drawer;
@@ -72,6 +74,7 @@ pub(crate) use blog_post_page::RenderBlogPostPage;
 pub(crate) use blog_post_page::RenderBlogPostPageInput;
 pub(crate) use blog_stream::RenderBlogStream;
 pub(crate) use blog_stream::RenderBlogStreamInput;
+pub(crate) use dependency_manager::DependencyManager;
 pub(crate) use document_element::RenderDocumentElement;
 pub(crate) use element::RenderElement;
 pub(crate) use footnote_definition::RenderRealFootnoteDefinition;

src/context/page.rs

@@ -4,6 +4,7 @@ use super::render_context::RenderContext;
 use super::GlobalSettings;
 use super::PageHeader;
 use super::RenderDocumentElement;
+use crate::context::macros::push_file;
 use crate::error::CustomError;
 use crate::intermediate::get_web_path;
 use crate::intermediate::IPage;
@@ -28,6 +29,7 @@ pub(crate) struct RenderPage {
 }
 
 render!(RenderPage, IPage, original, render_context, {
+    push_file!(render_context, &original.src, {
         let css_files = vec![
             get_web_path(
                 render_context.config,
@@ -99,4 +101,5 @@ render!(RenderPage, IPage, original, render_context, {
             footnotes,
         };
         Ok(ret)
+    })
 });

src/context/regular_link.rs

@@ -3,6 +3,7 @@ use serde::Serialize;
 use super::render_context::RenderContext;
 use crate::error::CustomError;
 use crate::intermediate::IRegularLink;
+use crate::intermediate::LinkTarget;
 
 use super::macros::render;
 use super::RenderObject;
@@ -10,13 +11,29 @@ use super::RenderObject;
 #[derive(Debug, Serialize)]
 #[serde(tag = "type")]
 #[serde(rename = "regular_link")]
-pub(crate) struct RenderRegularLink {
+pub(crate) enum RenderRegularLink {
+    #[serde(rename = "regular_link_anchor")]
+    Anchor(RenderRegularLinkAnchor),
+    #[serde(rename = "regular_link_image")]
+    Image(RenderRegularLinkImage),
+}
+
+#[derive(Debug, Serialize)]
+pub(crate) struct RenderRegularLinkAnchor {
     target: String,
     raw_link: String,
     children: Vec<RenderObject>,
     post_blank: organic::types::PostBlank,
 }
 
+#[derive(Debug, Serialize)]
+pub(crate) struct RenderRegularLinkImage {
+    src: String,
+    alt: String,
+    raw_link: String,
+    post_blank: organic::types::PostBlank,
+}
+
 render!(RenderRegularLink, IRegularLink, original, render_context, {
     let children = {
         let mut ret = Vec::new();
@@ -31,10 +48,22 @@ render!(RenderRegularLink, IRegularLink, original, render_context, {
         .generate_final_target(render_context.clone())?
         .unwrap_or_else(|| "".to_owned());
 
-    Ok(RenderRegularLink {
+    let render_link = match &original.target {
+        LinkTarget::Raw(_) | LinkTarget::Post { .. } | LinkTarget::Target { .. } => {
+            RenderRegularLink::Anchor(RenderRegularLinkAnchor {
                 target,
                 raw_link: original.raw_link.clone(),
                 children,
                 post_blank: original.post_blank,
             })
+        }
+        LinkTarget::Image { alt, .. } => RenderRegularLink::Image(RenderRegularLinkImage {
+            src: target,
+            alt: alt.clone(),
+            raw_link: original.raw_link.clone(),
+            post_blank: original.post_blank,
+        }),
+    };
+
+    Ok(render_link)
 });

src/context/render_context.rs

@@ -3,11 +3,12 @@ use std::path::Path;
 use crate::config::Config;
 use crate::error::CustomError;
 
+use super::dependency_manager::RefDependencyManager;
+
 /// The supporting information used for converting the intermediate representation into the dust context for rendering.
 #[derive(Debug, Clone)]
 pub(crate) struct RenderContext<'intermediate> {
     pub(crate) config: &'intermediate Config,
-    // TODO: Perhaps rename to output_root_directory.
     pub(crate) output_root_directory: &'intermediate Path,
     pub(crate) output_file: &'intermediate Path,
 
@@ -17,6 +18,13 @@ pub(crate) struct RenderContext<'intermediate> {
     /// IDs, for example, multiple blog posts with footnotes in a blog
     /// stream.
     pub(crate) id_addition: Option<&'intermediate str>,
+
+    /// Tracks dependencies from rendering Org document(s).
+    ///
+    /// Examples of dependencies would be:
+    ///   - Static files that need to be copied to the output folder
+    ///   - Code blocks that need to be executed (for example, gnuplot graphs)
+    pub(crate) dependency_manager: RefDependencyManager,
 }
 
 impl<'intermediate> RenderContext<'intermediate> {
@@ -25,12 +33,14 @@ impl<'intermediate> RenderContext<'intermediate> {
         output_directory: &'intermediate Path,
         output_file: &'intermediate Path,
         id_addition: Option<&'intermediate str>,
+        dependency_manager: RefDependencyManager,
     ) -> Result<RenderContext<'intermediate>, CustomError> {
         Ok(RenderContext {
             config,
             output_root_directory: output_directory,
             output_file,
             id_addition,
+            dependency_manager,
         })
     }
 }

src/intermediate/blog_post.rs

@@ -35,6 +35,7 @@ impl BlogPost {
         ) -> Result<BlogPost, CustomError> {
             let post_id = post_dir.strip_prefix(posts_dir)?.as_os_str();
 
+            // Load all the *.org files under the post directory from disk into memory
             let org_files = {
                 let mut ret = Vec::new();
                 let org_files_iter = get_org_files(post_dir).await?;
@@ -43,6 +44,8 @@ impl BlogPost {
                 }
                 ret
             };
+
+            // Parse all the *.org files
             let parsed_org_files = {
                 let mut ret = Vec::new();
                 for (path, contents) in org_files.iter() {
@@ -73,7 +76,11 @@ impl BlogPost {
                     ret.push(
                         BlogPostPage::new(
                             intermediate_context,
-                            BlogPostPageInput::new(relative_to_post_dir_path, parsed_document),
+                            BlogPostPageInput::new(
+                                relative_to_post_dir_path,
+                                real_path,
+                                parsed_document,
+                            ),
                         )
                         .await?,
                     );

src/intermediate/blog_post_page.rs

@@ -11,17 +11,23 @@ use super::ISection;
 
 #[derive(Debug)]
 pub(crate) struct BlogPostPageInput<'b, 'parse> {
+    /// Relative path from the root of the blog post.
     path: PathBuf,
+
+    /// The path to the .org source for the file.
+    src: PathBuf,
     document: &'b organic::types::Document<'parse>,
 }
 
 impl<'b, 'parse> BlogPostPageInput<'b, 'parse> {
-    pub(crate) fn new<P: Into<PathBuf>>(
+    pub(crate) fn new<P: Into<PathBuf>, S: Into<PathBuf>>(
         path: P,
+        src: S,
         document: &'b organic::types::Document<'parse>,
     ) -> BlogPostPageInput<'b, 'parse> {
         BlogPostPageInput {
             path: path.into(),
+            src: src.into(),
             document,
         }
     }
@@ -32,6 +38,9 @@ pub(crate) struct BlogPostPage {
     /// Relative path from the root of the blog post.
     pub(crate) path: PathBuf,
 
+    /// The path to the .org source for the file.
+    pub(crate) src: PathBuf,
+
     pub(crate) title: Option<String>,
 
     pub(crate) date: Option<String>,
@@ -79,6 +88,7 @@ intermediate!(
 
         Ok(BlogPostPage {
             path: original.path,
+            src: original.src,
             title: get_title(original.document),
             date: get_date(original.document),
             children,

src/intermediate/mod.rs

@@ -123,6 +123,7 @@ pub(crate) use radio_link::IRadioLink;
 pub(crate) use radio_target::IRadioTarget;
 pub(crate) use registry::Registry;
 pub(crate) use regular_link::IRegularLink;
+pub(crate) use regular_link::LinkTarget;
 pub(crate) use section::ISection;
 pub(crate) use special_block::ISpecialBlock;
 pub(crate) use src_block::ISrcBlock;

src/intermediate/page.rs

@@ -13,6 +13,9 @@ pub(crate) struct IPage {
     /// Relative path from the root of the pages directory.
     pub(crate) path: PathBuf,
 
+    /// The path to the .org source for the file.
+    pub(crate) src: PathBuf,
+
     pub(crate) title: Option<String>,
 
     #[allow(dead_code)]
@@ -61,6 +64,7 @@ intermediate!(
 
         Ok(IPage {
             path: original.path,
+            src: original.src,
             title: get_title(original.document),
             date: get_date(original.document),
             children,
@@ -80,17 +84,23 @@ impl IPage {
 
 #[derive(Debug)]
 pub(crate) struct PageInput<'b, 'parse> {
+    /// Relative path from the root of the page.
     path: PathBuf,
+
+    /// The path to the .org source for the file.
+    src: PathBuf,
     document: &'b organic::types::Document<'parse>,
 }
 
 impl<'b, 'parse> PageInput<'b, 'parse> {
-    pub(crate) fn new<P: Into<PathBuf>>(
+    pub(crate) fn new<P: Into<PathBuf>, S: Into<PathBuf>>(
         path: P,
+        src: S,
         document: &'b organic::types::Document<'parse>,
     ) -> PageInput<'b, 'parse> {
         PageInput {
             path: path.into(),
+            src: src.into(),
             document,
         }
     }

src/intermediate/regular_link.rs

@@ -1,3 +1,7 @@
+use std::borrow::Cow;
+use std::path::Path;
+
+use organic::types::LinkType;
 use organic::types::StandardProperties;
 use url::Url;
 
@@ -31,8 +35,11 @@ intermediate!(
             ret
         };
         let raw_link = original.get_raw_link();
-        let target =
-            LinkTarget::from_string(intermediate_context.clone(), raw_link.clone().into_owned())?;
+        let target = LinkTarget::from_string(
+            intermediate_context.clone(),
+            raw_link.clone().into_owned(),
+            &original.link_type,
+        )?;
         Ok(IRegularLink {
             raw_link: raw_link.into_owned(),
             children,
@@ -42,7 +49,7 @@ intermediate!(
     }
 );
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
 pub(crate) enum LinkTarget {
     Raw(String),
     Post {
@@ -52,13 +59,28 @@ pub(crate) enum LinkTarget {
     Target {
         target_id: String,
     },
+    Image {
+        src: String,
+        alt: String,
+    },
 }
 
 impl LinkTarget {
     pub(crate) fn from_string(
         intermediate_context: IntermediateContext<'_, '_>,
         input: String,
+        link_type: &LinkType<'_>,
     ) -> Result<LinkTarget, CustomError> {
+        // If link type is file and the path ends in .svg then make it an image target
+        if let LinkType::File = link_type
+            && input.to_ascii_lowercase().ends_with(".svg")
+        {
+            let src = Self::get_image_src(&input)?;
+            let alt = Self::get_image_alt(&input)?;
+
+            return Ok(LinkTarget::Image { src, alt });
+        };
+
         let parsed = Url::parse(&input);
         if let Err(url::ParseError::RelativeUrlWithoutBase) = parsed {
             let target_id = {
@@ -121,6 +143,170 @@ impl LinkTarget {
                     .unwrap_or_default(),
                 target_id
             ))),
+            LinkTarget::Image { src, .. } => {
+                let path_to_file = render_context
+                    .dependency_manager
+                    .lock()
+                    .unwrap()
+                    .get_current_folder()?
+                    .join(src)
+                    .canonicalize()?;
+                let input_root_directory = render_context.config.get_root_directory();
+                let relative_path_to_file = path_to_file.strip_prefix(input_root_directory)?;
+                let web_path = get_web_path(
+                    render_context.config,
+                    render_context.output_root_directory,
+                    render_context.output_file,
+                    relative_path_to_file,
+                )?;
+                let path_to_file = render_context
+                    .dependency_manager
+                    .lock()
+                    .unwrap()
+                    .mark_file_for_copying(path_to_file)?;
+                Ok(Some(web_path))
             }
         }
     }
+
+    /// Get the value for the src attribute of the image.
+    fn get_image_src(input: &str) -> Result<String, CustomError> {
+        let input = if input.to_ascii_lowercase().starts_with("file:") {
+            Cow::Borrowed(&input[5..])
+        } else {
+            Cow::Borrowed(input)
+        };
+        let path = Path::new(input.as_ref());
+
+        if input.to_ascii_lowercase().starts_with("/ssh:") {
+            return Ok(format!("file:/{}", input));
+        }
+
+        if path.is_absolute() {
+            return Ok(format!("file://{}", input));
+        }
+        return Ok(input.into_owned());
+    }
+
+    /// Get file name from the last segment of an image path.
+    fn get_image_alt(input: &str) -> Result<String, CustomError> {
+        let input = if input.to_ascii_lowercase().starts_with("file:") {
+            Cow::Borrowed(&input[5..])
+        } else {
+            Cow::Borrowed(input)
+        };
+        let path = Path::new(input.as_ref());
+        match path
+            .components()
+            .last()
+            .ok_or("Images should have at least one component in their path.")?
+        {
+            std::path::Component::Prefix(_) => {
+                // Prefix components only occur on windows
+                panic!("Prefix components are not supporterd.")
+            }
+            std::path::Component::RootDir
+            | std::path::Component::CurDir
+            | std::path::Component::ParentDir => {
+                return Err(
+                    "Final component of an image path should be a normal component.".into(),
+                );
+            }
+            std::path::Component::Normal(file_name) => Ok(file_name
+                .to_str()
+                .ok_or("Image link was not valid utf-8.")?
+                .to_owned()),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::borrow::Cow;
+    use std::sync::Arc;
+    use std::sync::Mutex;
+
+    use crate::intermediate::Registry;
+
+    use super::*;
+
+    #[test]
+    fn link_target_raw() -> Result<(), CustomError> {
+        let registry = Registry::new();
+        let registry = Arc::new(Mutex::new(registry));
+        let intermediate_context = IntermediateContext::new(registry)?;
+        for (inp, typ) in [(
+            "https://test.example/foo",
+            LinkType::Protocol(Cow::from("https")),
+        )] {
+            assert_eq!(
+                LinkTarget::from_string(intermediate_context.clone(), inp.to_owned(), &typ)?,
+                LinkTarget::Raw(inp.to_owned())
+            );
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn link_target_image() -> Result<(), CustomError> {
+        let registry = Registry::new();
+        let registry = Arc::new(Mutex::new(registry));
+        let intermediate_context = IntermediateContext::new(registry)?;
+        for (inp, typ, expected_src, expected_alt) in [
+            ("file:image.svg", LinkType::File, "image.svg", "image.svg"),
+            (
+                "file:/image.svg",
+                LinkType::File,
+                "file:///image.svg",
+                "image.svg",
+            ),
+            (
+                "file:./image.svg",
+                LinkType::File,
+                "./image.svg",
+                "image.svg",
+            ),
+            (
+                "/image.svg",
+                LinkType::File,
+                "file:///image.svg",
+                "image.svg",
+            ),
+            ("./image.svg", LinkType::File, "./image.svg", "image.svg"),
+            ("./image.SVG", LinkType::File, "./image.SVG", "image.SVG"),
+            (
+                "./image and stuff.SVG",
+                LinkType::File,
+                "./image and stuff.SVG",
+                "image and stuff.SVG",
+            ),
+            (
+                "/ssh:admin@test.example:important/file.svg",
+                LinkType::File,
+                "file://ssh:admin@test.example:important/file.svg",
+                "file.svg",
+            ),
+            (
+                "file:/ssh:admin@test.example:important/file.svg",
+                LinkType::File,
+                "file://ssh:admin@test.example:important/file.svg",
+                "file.svg",
+            ),
+            (
+                "file:/foo/bar/baz/image.svg",
+                LinkType::File,
+                "file:///foo/bar/baz/image.svg",
+                "image.svg",
+            ),
+        ] {
+            assert_eq!(
+                LinkTarget::from_string(intermediate_context.clone(), inp.to_owned(), &typ)?,
+                LinkTarget::Image {
+                    src: expected_src.to_owned(),
+                    alt: expected_alt.to_owned()
+                }
+            );
+        }
+        Ok(())
+    }
+}

src/main.rs

@@ -1,5 +1,4 @@
 #![feature(let_chains)]
-#![feature(async_closure)]
 use std::process::ExitCode;
 
 use clap::Parser;