Add optional labels to internal links

Internal links can have labels in the same manner as with external
links, by separating the label and path from each other with a ::
token.

2 files changed, 18 insertions, 6 deletions

diff --git a/src/line.rs b/src/line.rs
index b60b55c..5ef940f 100644
--- a/src/line.rs
+++ b/src/line.rs
@@ -81,6 +81,15 @@ impl ToString for Line {
     }
 }
 
+fn internal_link(inside: String) -> Option<Token> {
+    if let Some((label, path)) = inside.split_once("::") {
+        let label = label.trim().to_string();
+        let path = path.trim().to_string();
+        Some( Token::InternalLink { label, path } )
+    } else {
+        Some( Token::InternalLink { label: String::new(), path: inside })
+    }
+}
 
 fn external_link(inside: String) -> Option<Token> {
     if let Some((label, path)) = inside.split_once("::") {
@@ -101,7 +110,7 @@ const DELIMITERS: [(fn(String)->Option<Token>, &str, &str, &str); 6] = [
     ( make!(Token::Italic),       "_",  "_",  "_" ),
     ( make!(Token::Monospace),    "`",  "`",  "`" ),
     ( make!(Token::Math),         "$",  "$",  "$" ),
-    ( make!(Token::InternalLink), "{",  "}",  "{}" ),
+    ( internal_link,              "{",  "}",  "{}" ),
     ( external_link,              "<",  ">",  "<>" ),
 ];
 
diff --git a/src/token.rs b/src/token.rs
index f1f8288..0f44dc2 100644
--- a/src/token.rs
+++ b/src/token.rs
@@ -5,7 +5,7 @@ pub enum Token {
     Italic(String),
     Monospace(String),
     Math(String),
-    InternalLink(String),
+    InternalLink { label: String, path: String },
     ExternalLink { label: String, path: String },
 }
 
@@ -17,10 +17,13 @@ impl AsRef<str> for Token {
             Token::Italic(text) => text,
             Token::Monospace(text) => text,
             Token::Math(text) => text,
-            Token::InternalLink(name) => name,
-            Token::ExternalLink { label, path } => match !label.is_empty() {
-                true => label,
-                false => path,
+            Token::InternalLink { label, path } => match label.is_empty() {
+                true => path,
+                false => label,
+            },
+            Token::ExternalLink { label, path } => match label.is_empty() {
+                true => path,
+                false => label,
             },
         }
     }