Further extract error code switch

Removes dependency on UnstableFeatures from markdown rendering

diff --git a/src/librustdoc/externalfiles.rs b/src/librustdoc/externalfiles.rs
index 10b6c9850ae7773dc99d20972ce918c9f42570cc..67502ab8e1531f515cc73dd972fb220164a98ca1 100644 (file)
--- a/src/librustdoc/externalfiles.rs
+++ b/src/librustdoc/externalfiles.rs
@@ -12,7 +12,8 @@
 use std::path::Path;
 use std::str;
 use errors;
-use html::markdown::Markdown;
+use syntax::feature_gate::UnstableFeatures;
+use html::markdown::{ErrorCodes, Markdown};
 
 #[derive(Clone)]
 pub struct ExternalHtml {
@@ -31,6 +32,7 @@ impl ExternalHtml {
     pub fn load(in_header: &[String], before_content: &[String], after_content: &[String],
                 md_before_content: &[String], md_after_content: &[String], diag: &errors::Handler)
             -> Option<ExternalHtml> {
+        let codes = ErrorCodes::from(UnstableFeatures::from_environment().is_nightly_build());
         load_external_files(in_header, diag)
             .and_then(|ih|
                 load_external_files(before_content, diag)
@@ -38,7 +40,7 @@ pub fn load(in_header: &[String], before_content: &[String], after_content: &[St
             )
             .and_then(|(ih, bc)|
                 load_external_files(md_before_content, diag)
-                    .map(|m_bc| (ih, format!("{}{}", bc, Markdown(&m_bc, &[]))))
+                    .map(|m_bc| (ih, format!("{}{}", bc, Markdown(&m_bc, &[], codes))))
             )
             .and_then(|(ih, bc)|
                 load_external_files(after_content, diag)
@@ -46,7 +48,7 @@ pub fn load(in_header: &[String], before_content: &[String], after_content: &[St
             )
             .and_then(|(ih, bc, ac)|
                 load_external_files(md_after_content, diag)
-                    .map(|m_ac| (ih, bc, format!("{}{}", ac, Markdown(&m_ac, &[]))))
+                    .map(|m_ac| (ih, bc, format!("{}{}", ac, Markdown(&m_ac, &[], codes))))
             )
             .map(|(ih, bc, ac)|
                 ExternalHtml {

diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 54fd041fb004bcaf97bdc6230758a884d79089fc..f65211f97be58ab5cad2f66938d8f9f03219e8f9 100644 (file)
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -18,10 +18,10 @@
 //! ```
 //! #![feature(rustc_private)]
 //!
-//! use rustdoc::html::markdown::Markdown;
+//! use rustdoc::html::markdown::{Markdown, ErrorCodes};
 //!
 //! let s = "My *markdown* _text_";
-//! let html = format!("{}", Markdown(s, &[]));
+//! let html = format!("{}", Markdown(s, &[], ErrorCodes::Yes));
 //! // ... something using html
 //! ```
 
@@ -35,7 +35,6 @@
 use std::ops::Range;
 use std::str;
 
-use syntax::feature_gate::UnstableFeatures;
 use html::render::derive_id;
 use html::toc::TocBuilder;
 use html::highlight;
@@ -48,15 +47,37 @@
 /// formatted, this struct will emit the HTML corresponding to the rendered
 /// version of the contained markdown string.
 /// The second parameter is a list of link replacements
-pub struct Markdown<'a>(pub &'a str, pub &'a [(String, String)]);
+pub struct Markdown<'a>(pub &'a str, pub &'a [(String, String)], pub ErrorCodes);
 /// A unit struct like `Markdown`, that renders the markdown with a
 /// table of contents.
-pub struct MarkdownWithToc<'a>(pub &'a str);
+pub struct MarkdownWithToc<'a>(pub &'a str, pub ErrorCodes);
 /// A unit struct like `Markdown`, that renders the markdown escaping HTML tags.
-pub struct MarkdownHtml<'a>(pub &'a str);
+pub struct MarkdownHtml<'a>(pub &'a str, pub ErrorCodes);
 /// A unit struct like `Markdown`, that renders only the first paragraph.
 pub struct MarkdownSummaryLine<'a>(pub &'a str, pub &'a [(String, String)]);
 
+#[derive(Copy, Clone, PartialEq, Debug)]
+pub enum ErrorCodes {
+    Yes,
+    No,
+}
+
+impl ErrorCodes {
+    pub fn from(b: bool) -> Self {
+        match b {
+            true => ErrorCodes::Yes,
+            false => ErrorCodes::No,
+        }
+    }
+
+    pub fn as_bool(self) -> bool {
+        match self {
+            ErrorCodes::Yes => true,
+            ErrorCodes::No => false,
+        }
+    }
+}
+
 /// Controls whether a line will be hidden or shown in HTML output.
 ///
 /// All lines are used in documentation tests.
@@ -127,14 +148,14 @@ fn slugify(c: char) -> Option<char> {
 /// Adds syntax highlighting and playground Run buttons to rust code blocks.
 struct CodeBlocks<'a, I: Iterator<Item = Event<'a>>> {
     inner: I,
-    check_error_codes: bool,
+    check_error_codes: ErrorCodes,
 }
 
 impl<'a, I: Iterator<Item = Event<'a>>> CodeBlocks<'a, I> {
-    fn new(iter: I) -> Self {
+    fn new(iter: I, error_codes: ErrorCodes) -> Self {
         CodeBlocks {
             inner: iter,
-            check_error_codes: UnstableFeatures::from_environment().is_nightly_build(),
+            check_error_codes: error_codes,
         }
     }
 }
@@ -476,9 +497,8 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 }
 
 pub fn find_testable_code(
-    doc: &str, tests: &mut test::Collector
+    doc: &str, tests: &mut test::Collector, error_codes: ErrorCodes,
 ) -> Result<(), TestableCodeError> {
-    let is_nightly = UnstableFeatures::from_environment().is_nightly_build();
     let mut parser = Parser::new(doc);
     let mut prev_offset = 0;
     let mut nb_lines = 0;
@@ -489,7 +509,7 @@ pub fn find_testable_code(
                 let block_info = if s.is_empty() {
                     LangString::all_false()
                 } else {
-                    LangString::parse(&*s, is_nightly)
+                    LangString::parse(&*s, error_codes)
                 };
                 if !block_info.rust {
                     continue
@@ -570,7 +590,8 @@ fn all_false() -> LangString {
         }
     }
 
-    fn parse(string: &str, allow_error_code_check: bool) -> LangString {
+    fn parse(string: &str, allow_error_code_check: ErrorCodes) -> LangString {
+        let allow_error_code_check = allow_error_code_check.as_bool();
         let mut seen_rust_tags = false;
         let mut seen_other_tags = false;
         let mut data = LangString::all_false();
@@ -620,7 +641,7 @@ fn parse(string: &str, allow_error_code_check: bool) -> LangString {
 
 impl<'a> fmt::Display for Markdown<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        let Markdown(md, links) = *self;
+        let Markdown(md, links, codes) = *self;
 
         // This is actually common enough to special-case
         if md.is_empty() { return Ok(()) }
@@ -645,7 +666,7 @@ fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
                             CodeBlocks::new(
                                 LinkReplacer::new(
                                     HeadingLinks::new(p, None),
-                                    links))));
+                                    links), codes)));
 
         fmt.write_str(&s)
     }
@@ -653,7 +674,7 @@ fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
 
 impl<'a> fmt::Display for MarkdownWithToc<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        let MarkdownWithToc(md) = *self;
+        let MarkdownWithToc(md, codes) = *self;
 
         let mut opts = Options::empty();
         opts.insert(OPTION_ENABLE_TABLES);
@@ -665,8 +686,12 @@ fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
 
         let mut toc = TocBuilder::new();
 
-        html::push_html(&mut s,
-                        Footnotes::new(CodeBlocks::new(HeadingLinks::new(p, Some(&mut toc)))));
+        {
+            let p = HeadingLinks::new(p, Some(&mut toc));
+            let p = CodeBlocks::new(p, codes);
+            let p = Footnotes::new(p);
+            html::push_html(&mut s, p);
+        }
 
         write!(fmt, "<nav id=\"TOC\">{}</nav>", toc.into_toc())?;
 
@@ -676,7 +701,7 @@ fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
 
 impl<'a> fmt::Display for MarkdownHtml<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        let MarkdownHtml(md) = *self;
+        let MarkdownHtml(md, codes) = *self;
 
         // This is actually common enough to special-case
         if md.is_empty() { return Ok(()) }
@@ -694,8 +719,10 @@ fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
 
         let mut s = String::with_capacity(md.len() * 3 / 2);
 
-        html::push_html(&mut s,
-                        Footnotes::new(CodeBlocks::new(HeadingLinks::new(p, None))));
+        let p = HeadingLinks::new(p, None);
+        let p = CodeBlocks::new(p, codes);
+        let p = Footnotes::new(p);
+        html::push_html(&mut s, p);
 
         fmt.write_str(&s)
     }
@@ -830,7 +857,7 @@ pub fn markdown_links(md: &str) -> Vec<(String, Option<Range<usize>>)> {
 
 #[cfg(test)]
 mod tests {
-    use super::{LangString, Markdown, MarkdownHtml};
+    use super::{ErrorCodes, LangString, Markdown, MarkdownHtml};
     use super::plain_summary_line;
     use html::render::reset_ids;
 
@@ -839,7 +866,7 @@ fn test_lang_string_parse() {
         fn t(s: &str,
             should_panic: bool, no_run: bool, ignore: bool, rust: bool, test_harness: bool,
             compile_fail: bool, allow_fail: bool, error_codes: Vec<String>) {
-            assert_eq!(LangString::parse(s, true), LangString {
+            assert_eq!(LangString::parse(s, ErrorCodes::Yes), LangString {
                 should_panic,
                 no_run,
                 ignore,
@@ -878,14 +905,14 @@ fn v() -> Vec<String> {
     #[test]
     fn issue_17736() {
         let markdown = "# title";
-        Markdown(markdown, &[]).to_string();
+        Markdown(markdown, &[], ErrorCodes::Yes).to_string();
         reset_ids(true);
     }
 
     #[test]
     fn test_header() {
         fn t(input: &str, expect: &str) {
-            let output = Markdown(input, &[]).to_string();
+            let output = Markdown(input, &[], ErrorCodes::Yes).to_string();
             assert_eq!(output, expect, "original: {}", input);
             reset_ids(true);
         }
@@ -907,7 +934,7 @@ fn t(input: &str, expect: &str) {
     #[test]
     fn test_header_ids_multiple_blocks() {
         fn t(input: &str, expect: &str) {
-            let output = Markdown(input, &[]).to_string();
+            let output = Markdown(input, &[], ErrorCodes::Yes).to_string();
             assert_eq!(output, expect, "original: {}", input);
         }
 
@@ -948,7 +975,7 @@ fn t(input: &str, expect: &str) {
     #[test]
     fn test_markdown_html_escape() {
         fn t(input: &str, expect: &str) {
-            let output = MarkdownHtml(input).to_string();
+            let output = MarkdownHtml(input, ErrorCodes::Yes).to_string();
             assert_eq!(output, expect, "original: {}", input);
         }
 

diff --git a/src/librustdoc/html/render.rs b/src/librustdoc/html/render.rs
index 24a9bf416e44420f101972a7c7cd52dee65b3180..b9b058cb54826f75523212e6b95c431bfaafde3a 100644 (file)
--- a/src/librustdoc/html/render.rs
+++ b/src/librustdoc/html/render.rs
@@ -56,6 +56,7 @@
 use serialize::json::{ToJson, Json, as_json};
 use syntax::ast;
 use syntax::codemap::FileName;
+use syntax::feature_gate::UnstableFeatures;
 use rustc::hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId};
 use rustc::middle::privacy::AccessLevels;
 use rustc::middle::stability;
@@ -72,7 +73,7 @@
 use html::format::{VisSpace, Method, UnsafetySpace, MutableSpace};
 use html::format::fmt_impl_for_trait_page;
 use html::item_type::ItemType;
-use html::markdown::{self, Markdown, MarkdownHtml, MarkdownSummaryLine};
+use html::markdown::{self, Markdown, MarkdownHtml, MarkdownSummaryLine, ErrorCodes};
 use html::{highlight, layout};
 
 use minifier;
@@ -99,6 +100,7 @@ pub struct Context {
     /// real location of an item. This is used to allow external links to
     /// publicly reused items to redirect to the right location.
     pub render_redirect_pages: bool,
+    pub codes: ErrorCodes,
     pub shared: Arc<SharedContext>,
 }
 
@@ -581,6 +583,7 @@ pub fn run(mut krate: clean::Crate,
         current: Vec::new(),
         dst,
         render_redirect_pages: false,
+        codes: ErrorCodes::from(UnstableFeatures::from_environment().is_nightly_build()),
         shared: Arc::new(scx),
     };
 
@@ -2221,13 +2224,14 @@ fn document(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item) -> fmt::Re
 fn render_markdown(w: &mut fmt::Formatter,
                    md_text: &str,
                    links: Vec<(String, String)>,
-                   prefix: &str,)
+                   prefix: &str,
+                   codes: ErrorCodes)
                    -> fmt::Result {
-    write!(w, "<div class='docblock'>{}{}</div>", prefix, Markdown(md_text, &links))
+    write!(w, "<div class='docblock'>{}{}</div>", prefix, Markdown(md_text, &links, codes))
 }
 
 fn document_short(w: &mut fmt::Formatter, item: &clean::Item, link: AssocItemLink,
-                  prefix: &str) -> fmt::Result {
+                  prefix: &str, codes: ErrorCodes) -> fmt::Result {
     if let Some(s) = item.doc_value() {
         let markdown = if s.contains('\n') {
             format!("{} [Read more]({})",
@@ -2235,7 +2239,7 @@ fn document_short(w: &mut fmt::Formatter, item: &clean::Item, link: AssocItemLin
         } else {
             plain_summary_line(Some(s)).to_string()
         };
-        render_markdown(w, &markdown, item.links(), prefix)?;
+        render_markdown(w, &markdown, item.links(), prefix, codes)?;
     } else if !prefix.is_empty() {
         write!(w, "<div class='docblock'>{}</div>", prefix)?;
     }
@@ -2261,7 +2265,7 @@ fn document_full(w: &mut fmt::Formatter, item: &clean::Item,
                  cx: &Context, prefix: &str) -> fmt::Result {
     if let Some(s) = cx.shared.maybe_collapsed_doc_value(item) {
         debug!("Doc block: =====\n{}\n=====", s);
-        render_markdown(w, &*s, item.links(), prefix)?;
+        render_markdown(w, &*s, item.links(), prefix, cx.codes)?;
     } else if !prefix.is_empty() {
         write!(w, "<div class='docblock'>{}</div>", prefix)?;
     }
@@ -2508,6 +2512,7 @@ fn cmp(i1: &clean::Item, i2: &clean::Item, idx1: usize, idx2: usize) -> Ordering
 
 fn short_stability(item: &clean::Item, cx: &Context, show_reason: bool) -> Vec<String> {
     let mut stability = vec![];
+    let error_codes = ErrorCodes::from(UnstableFeatures::from_environment().is_nightly_build());
 
     if let Some(stab) = item.stability.as_ref() {
         let deprecated_reason = if show_reason && !stab.deprecated_reason.is_empty() {
@@ -2521,14 +2526,11 @@ fn short_stability(item: &clean::Item, cx: &Context, show_reason: bool) -> Vec<S
             } else {
                 String::new()
             };
+            let html = MarkdownHtml(&deprecated_reason, error_codes);
             let text = if stability::deprecation_in_effect(&stab.deprecated_since) {
-                format!("Deprecated{}{}",
-                        since,
-                        MarkdownHtml(&deprecated_reason))
+                format!("Deprecated{}{}", since, html)
             } else {
-                format!("Deprecating in {}{}",
-                        Escape(&stab.deprecated_since),
-                        MarkdownHtml(&deprecated_reason))
+                format!("Deprecating in {}{}", Escape(&stab.deprecated_since), html)
             };
             stability.push(format!("<div class='stab deprecated'>{}</div>", text))
         };
@@ -2559,7 +2561,9 @@ fn short_stability(item: &clean::Item, cx: &Context, show_reason: bool) -> Vec<S
                                         This is a nightly-only experimental API. {}\
                                         </summary>{}",
                                        unstable_extra,
-                                       MarkdownHtml(&stab.unstable_reason));
+                                       MarkdownHtml(
+                                           &stab.unstable_reason,
+                                           error_codes));
                     stability.push(format!("<div class='stab unstable'><details>{}</details></div>",
                                    text));
                 }
@@ -2582,11 +2586,11 @@ fn short_stability(item: &clean::Item, cx: &Context, show_reason: bool) -> Vec<S
         let text = if stability::deprecation_in_effect(&depr.since) {
             format!("Deprecated{}{}",
                     since,
-                    MarkdownHtml(&note))
+                    MarkdownHtml(&note, error_codes))
         } else {
             format!("Deprecating in {}{}",
                     Escape(&depr.since),
-                    MarkdownHtml(&note))
+                    MarkdownHtml(&note, error_codes))
         };
         stability.push(format!("<div class='stab deprecated'>{}</div>", text))
     }
@@ -3811,7 +3815,7 @@ fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLi
         write!(w, "</span></td></tr></tbody></table></h3>")?;
         if let Some(ref dox) = cx.shared.maybe_collapsed_doc_value(&i.impl_item) {
             write!(w, "<div class='docblock'>{}</div>",
-                   Markdown(&*dox, &i.impl_item.links()))?;
+                   Markdown(&*dox, &i.impl_item.links(), cx.codes))?;
         }
     }
 
@@ -3897,7 +3901,7 @@ fn doc_impl_item(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item,
                         } else if show_def_docs {
                             // In case the item isn't documented,
                             // provide short documentation from the trait.
-                            document_short(w, it, link, &prefix)?;
+                            document_short(w, it, link, &prefix, cx.codes)?;
                         }
                     }
                 } else {
@@ -3909,7 +3913,7 @@ fn doc_impl_item(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item,
             } else {
                 document_stability(w, cx, item)?;
                 if show_def_docs {
-                    document_short(w, item, link, &prefix)?;
+                    document_short(w, item, link, &prefix, cx.codes)?;
                 }
             }
         }

diff --git a/src/librustdoc/markdown.rs b/src/librustdoc/markdown.rs
index 4d1eae1470f041bff74bf319f3e67f39cee4a6df..97a3b2c1ea02cdc995b618fc2a1c01189043cb4d 100644 (file)
--- a/src/librustdoc/markdown.rs
+++ b/src/librustdoc/markdown.rs
@@ -19,6 +19,7 @@
 use rustc::session::search_paths::SearchPaths;
 use rustc::session::config::{Externs, CodegenOptions};
 use syntax::codemap::DUMMY_SP;
+use syntax::feature_gate::UnstableFeatures;
 use syntax::edition::Edition;
 
 use externalfiles::{ExternalHtml, LoadStringError, load_string};
@@ -26,7 +27,7 @@
 use html::render::reset_ids;
 use html::escape::Escape;
 use html::markdown;
-use html::markdown::{Markdown, MarkdownWithToc, find_testable_code};
+use html::markdown::{ErrorCodes, Markdown, MarkdownWithToc, find_testable_code};
 use test::{TestOptions, Collector};
 
 /// Separate any lines at the start of the file that begin with `# ` or `%`.
@@ -88,10 +89,11 @@ pub fn render(input: &Path, mut output: PathBuf, matches: &getopts::Matches,
 
     reset_ids(false);
 
+    let error_codes = ErrorCodes::from(UnstableFeatures::from_environment().is_nightly_build());
     let text = if include_toc {
-        MarkdownWithToc(text).to_string()
+        MarkdownWithToc(text, error_codes).to_string()
     } else {
-        Markdown(text, &[]).to_string()
+        Markdown(text, &[], error_codes).to_string()
     };
 
     let err = write!(
@@ -157,7 +159,8 @@ pub fn test(input: &str, cfgs: Vec<String>, libs: SearchPaths, externs: Externs,
                                        Some(PathBuf::from(input)),
                                        linker, edition);
     collector.set_position(DUMMY_SP);
-    let res = find_testable_code(&input_str, &mut collector);
+    let codes = ErrorCodes::from(UnstableFeatures::from_environment().is_nightly_build());
+    let res = find_testable_code(&input_str, &mut collector, codes);
     if let Err(err) = res {
         diag.span_warn(DUMMY_SP, &err.to_string());
     }

diff --git a/src/librustdoc/test.rs b/src/librustdoc/test.rs
index 9723b4528008956b80c64b99494ac22a5c5aa23d..650a2408aa6edba9d60ab6e73d67902ff8cc4e3a 100644 (file)
--- a/src/librustdoc/test.rs
+++ b/src/librustdoc/test.rs
@@ -42,7 +42,7 @@
 use errors::emitter::ColorConfig;
 
 use clean::Attributes;
-use html::markdown::{self, LangString};
+use html::markdown::{self, ErrorCodes, LangString};
 
 #[derive(Clone, Default)]
 pub struct TestOptions {
@@ -145,7 +145,8 @@ pub fn run(input_path: &Path,
             let mut hir_collector = HirCollector {
                 sess: &sess,
                 collector: &mut collector,
-                map: &map
+                map: &map,
+                codes: ErrorCodes::from(sess.opts.unstable_features.is_nightly_build()),
             };
             hir_collector.visit_testable("".to_string(), &krate.attrs, |this| {
                 intravisit::walk_crate(this, krate);
@@ -662,7 +663,8 @@ pub fn register_header(&mut self, name: &str, level: u32) {
 struct HirCollector<'a, 'hir: 'a> {
     sess: &'a session::Session,
     collector: &'a mut Collector,
-    map: &'a hir::map::Map<'hir>
+    map: &'a hir::map::Map<'hir>,
+    codes: ErrorCodes,
 }
 
 impl<'a, 'hir> HirCollector<'a, 'hir> {
@@ -688,7 +690,7 @@ fn visit_testable<F: FnOnce(&mut Self)>(&mut self,
         // anything else, this will combine them for us
         if let Some(doc) = attrs.collapsed_doc_value() {
             self.collector.set_position(attrs.span.unwrap_or(DUMMY_SP));
-            let res = markdown::find_testable_code(&doc, self.collector);
+            let res = markdown::find_testable_code(&doc, self.collector, self.codes);
             if let Err(err) = res {
                 self.sess.diagnostic().span_warn(attrs.span.unwrap_or(DUMMY_SP),
                     &err.to_string());

diff --git a/src/tools/error_index_generator/main.rs b/src/tools/error_index_generator/main.rs
index e72f90554d3c504bcc144b01f6cda4387912ac36..79c5be125b35fda19d51b9a358954f2bf2dccc05 100644 (file)
--- a/src/tools/error_index_generator/main.rs
+++ b/src/tools/error_index_generator/main.rs
@@ -24,7 +24,7 @@
 
 use syntax::diagnostics::metadata::{get_metadata_dir, ErrorMetadataMap, ErrorMetadata};
 
-use rustdoc::html::markdown::{Markdown, PLAYGROUND};
+use rustdoc::html::markdown::{Markdown, ErrorCodes, PLAYGROUND};
 use rustc_serialize::json;
 
 enum OutputFormat {
@@ -100,7 +100,7 @@ fn error_code_block(&self, output: &mut dyn Write, info: &ErrorMetadata,
 
         // Description rendered as markdown.
         match info.description {
-            Some(ref desc) => write!(output, "{}", Markdown(desc, &[]))?,
+            Some(ref desc) => write!(output, "{}", Markdown(desc, &[], ErrorCodes::Yes))?,
             None => write!(output, "<p>No description.</p>\n")?,
         }