Make wikilinks orders mutually exclusive

examples/s-expr.rs

@@ -14,7 +14,7 @@ const INDENT: usize = 4;
 const CLOSE_NEWLINE: bool = false;
 
 use comrak::nodes::{AstNode, NodeValue};
-use comrak::{parse_document, Arena, ExtensionOptions, Options};
+use comrak::{parse_document, Arena, ExtensionOptions, Options, WikiLinksMode};
 use std::env;
 use std::error::Error;
 use std::fs::File;
@@ -86,8 +86,7 @@ fn dump(source: &str) -> io::Result<()> {
         .multiline_block_quotes(true)
         .math_dollars(true)
         .math_code(true)
-        .wikilinks_title_after_pipe(true)
-        .wikilinks_title_before_pipe(true)
+        .wikilinks(WikiLinksMode::TitleFirst)
         .build();
 
     let opts = Options {

src/cm.rs

@@ -6,7 +6,7 @@ use crate::nodes::{
 use crate::nodes::{NodeList, TableAlignment};
 #[cfg(feature = "shortcodes")]
 use crate::parser::shortcodes::NodeShortCode;
-use crate::parser::Options;
+use crate::parser::{Options, WikiLinksMode};
 use crate::scanners;
 use crate::strings::trim_start_match;
 use crate::{nodes, Plugins};
@@ -761,12 +761,12 @@ impl<'a, 'o> CommonMarkFormatter<'a, 'o> {
     fn format_wikilink(&mut self, nl: &NodeWikiLink, entering: bool) -> bool {
         if entering {
             write!(self, "[[").unwrap();
-            if self.options.extension.wikilinks_title_after_pipe {
+            if self.options.extension.wikilinks == Some(WikiLinksMode::UrlFirst) {
                 self.output(nl.url.as_bytes(), false, Escaping::Url);
                 write!(self, "|").unwrap();
             }
         } else {
-            if self.options.extension.wikilinks_title_before_pipe {
+            if self.options.extension.wikilinks == Some(WikiLinksMode::TitleFirst) {
                 write!(self, "|").unwrap();
                 self.output(nl.url.as_bytes(), false, Escaping::Url);
             }

src/lib.rs

@@ -93,7 +93,7 @@ pub use parser::{
     parse_document, BrokenLinkCallback, BrokenLinkReference, ExtensionOptions,
     ExtensionOptionsBuilder, ListStyleType, Options, ParseOptions, ParseOptionsBuilder, Plugins,
     PluginsBuilder, RenderOptions, RenderOptionsBuilder, RenderPlugins, RenderPluginsBuilder,
-    ResolvedReference, URLRewriter,
+    ResolvedReference, URLRewriter, WikiLinksMode,
 };
 pub use typed_arena::Arena;
 pub use xml::format_document as format_xml;

src/main.rs

@@ -13,7 +13,7 @@ use std::path::PathBuf;
 use std::process;
 
 use clap::{Parser, ValueEnum};
-use comrak::{ExtensionOptions, ParseOptions, RenderOptions};
+use comrak::{ExtensionOptions, ParseOptions, RenderOptions, WikiLinksMode};
 
 const EXIT_SUCCESS: i32 = 0;
 const EXIT_PARSE_CONFIG: i32 = 2;
@@ -252,6 +252,21 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     let exts = &cli.extensions;
 
+    let wikilinks_title_after_pipe = exts.contains(&Extension::WikilinksTitleAfterPipe);
+    let wikilinks_title_before_pipe = exts.contains(&Extension::WikilinksTitleBeforePipe);
+    let wikilinks_mode = match (wikilinks_title_after_pipe, wikilinks_title_before_pipe) {
+        (false, false) => None,
+        (true, false) => Some(WikiLinksMode::UrlFirst),
+        (false, true) => Some(WikiLinksMode::TitleFirst),
+        (true, true) => {
+            eprintln!(concat!(
+                "cannot enable both wikilinks-title-after-pipe ",
+                "and wikilinks-title-before-pipe at the same time"
+            ));
+            process::exit(EXIT_PARSE_CONFIG);
+        }
+    };
+
     let extension = ExtensionOptions::builder()
         .strikethrough(exts.contains(&Extension::Strikethrough) || cli.gfm)
         .tagfilter(exts.contains(&Extension::Tagfilter) || cli.gfm)
@@ -265,8 +280,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         .multiline_block_quotes(exts.contains(&Extension::MultilineBlockQuotes))
         .math_dollars(exts.contains(&Extension::MathDollars))
         .math_code(exts.contains(&Extension::MathCode))
-        .wikilinks_title_after_pipe(exts.contains(&Extension::WikilinksTitleAfterPipe))
-        .wikilinks_title_before_pipe(exts.contains(&Extension::WikilinksTitleBeforePipe))
+        .maybe_wikilinks(wikilinks_mode)
         .underline(exts.contains(&Extension::Underline))
         .subscript(exts.contains(&Extension::Subscript))
         .spoiler(exts.contains(&Extension::Spoiler))

src/parser/inlines.rs

@@ -21,6 +21,8 @@ use std::str;
 use typed_arena::Arena;
 use unicode_categories::UnicodeCategories;
 
+use super::WikiLinksMode;
+
 const MAXBACKTICKS: usize = 80;
 const MAX_LINK_LABEL_LENGTH: usize = 1000;
 const MAX_MATH_DOLLARS: usize = 2;
@@ -235,8 +237,7 @@ impl<'a, 'r, 'o, 'd, 'i> Subject<'a, 'r, 'o, 'd, 'i> {
 
                 let mut wikilink_inl = None;
 
-                if (self.options.extension.wikilinks_title_after_pipe
-                    || self.options.extension.wikilinks_title_before_pipe)
+                if self.options.extension.wikilinks.is_some()
                     && !self.within_brackets
                     && self.peek_char() == Some(&(b'['))
                 {
@@ -1804,16 +1805,16 @@ impl<'a, 'r, 'o, 'd, 'i> Subject<'a, 'r, 'o, 'd, 'i> {
         if self.peek_char() == Some(&(b']')) && self.peek_char_n(1) == Some(&(b']')) {
             self.pos += 2;
 
-            if self.options.extension.wikilinks_title_after_pipe {
-                Some(WikilinkComponents {
+            match self.options.extension.wikilinks {
+                Some(WikiLinksMode::UrlFirst) => Some(WikilinkComponents {
                     url: left,
                     link_label: Some((right, right_startpos + 1, self.pos - 3)),
-                })
-            } else {
-                Some(WikilinkComponents {
+                }),
+                Some(WikiLinksMode::TitleFirst) => Some(WikilinkComponents {
                     url: right,
                     link_label: Some((left, left_startpos + 1, right_startpos - 1)),
-                })
+                }),
+                None => unreachable!(),
             }
         } else {
             self.pos = left_startpos;

src/parser/mod.rs

@@ -192,6 +192,21 @@ where
     }
 }
 
+#[non_exhaustive]
+#[derive(Debug, Clone, PartialEq, Eq, Copy)]
+#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
+/// Selects between wikilinks with the title first or the URL first.
+///
+/// See [`ExtensionOptions::wikilinks`].
+pub enum WikiLinksMode {
+    /// Indicates that the URL precedes the title. For example: `[[http://example.com|link
+    /// title]]`.
+    UrlFirst,
+
+    /// Indicates that the title precedes the URL. For example: `[[link title|http://example.com]]`.
+    TitleFirst,
+}
+
 #[non_exhaustive]
 #[derive(Default, Debug, Clone, Builder)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
@@ -466,37 +481,28 @@ pub struct ExtensionOptions {
     #[builder(default)]
     pub shortcodes: bool,
 
-    /// Enables wikilinks using title after pipe syntax
+    /// Enables wikilinks
+    ///
+    /// With [`WikiLinksMode::TitleFirst`]:
     ///
     /// ```` md
-    /// [[url|link label]]
+    /// [[link label|url]]
     /// ````
     ///
-    /// ```
-    /// # use comrak::{markdown_to_html, Options};
-    /// let mut options = Options::default();
-    /// options.extension.wikilinks_title_after_pipe = true;
-    /// assert_eq!(markdown_to_html("[[url|link label]]", &options),
-    ///            "<p><a href=\"url\" data-wikilink=\"true\">link label</a></p>\n");
-    /// ```
-    #[builder(default)]
-    pub wikilinks_title_after_pipe: bool,
-
-    /// Enables wikilinks using title before pipe syntax
+    /// With [`WikiLinksMode::UrlFirst`]:
     ///
     /// ```` md
-    /// [[link label|url]]
+    /// [[url|link label]]
     /// ````
     ///
     /// ```
-    /// # use comrak::{markdown_to_html, Options};
+    /// # use comrak::{markdown_to_html, Options, WikiLinksMode};
     /// let mut options = Options::default();
-    /// options.extension.wikilinks_title_before_pipe = true;
+    /// options.extension.wikilinks = Some(WikiLinksMode::TitleFirst);
     /// assert_eq!(markdown_to_html("[[link label|url]]", &options),
     ///            "<p><a href=\"url\" data-wikilink=\"true\">link label</a></p>\n");
     /// ```
-    #[builder(default)]
-    pub wikilinks_title_before_pipe: bool,
+    pub wikilinks: Option<WikiLinksMode>,
 
     /// Enables underlines using double underscores
     ///

src/tests/api.rs

@@ -1,6 +1,6 @@
 use std::sync::{Arc, Mutex};
 
-use parser::BrokenLinkReference;
+use parser::{BrokenLinkReference, WikiLinksMode};
 
 use crate::{
     adapters::{HeadingAdapter, HeadingMeta, SyntaxHighlighterAdapter},
@@ -69,8 +69,7 @@ fn exercise_full_api() {
     let extension = extension.shortcodes(true);
 
     let _extension = extension
-        .wikilinks_title_after_pipe(true)
-        .wikilinks_title_before_pipe(true)
+        .wikilinks(WikiLinksMode::UrlFirst)
         .underline(true)
         .subscript(true)
         .spoiler(true)

src/tests/commonmark.rs

@@ -4,6 +4,7 @@ use self::nodes::{Ast, LineColumn, ListType, NodeList};
 
 use super::*;
 use ntest::test_case;
+use parser::WikiLinksMode;
 
 #[test]
 fn commonmark_removes_redundant_strong() {
@@ -83,7 +84,7 @@ fn math(markdown: &str, cm: &str) {
 #[test_case("This [[url|link label]] that", "This [[url|link%20label]] that\n")]
 fn wikilinks(markdown: &str, cm: &str) {
     let mut options = Options::default();
-    options.extension.wikilinks_title_before_pipe = true;
+    options.extension.wikilinks = Some(WikiLinksMode::TitleFirst);
 
     commonmark(markdown, cm, Some(&options));
 }