Have a separate message for raw URLs in doc

clippy_lints/src/doc.rs

@@ -5,6 +5,7 @@ use syntax::ast;
 use syntax::codemap::{BytePos, Span};
 use syntax_pos::Pos;
 use utils::span_lint;
+use url::Url;
 
 /// **What it does:** Checks for the presence of `_`, `::` or camel-case words
 /// outside ticks in documentation.
@@ -280,6 +281,18 @@ fn check_word(cx: &EarlyContext, word: &str, span: Span) {
         s != "_" && !s.contains("\\_") && s.contains('_')
     }
 
+    if let Ok(url) = Url::parse(word) {
+        // try to get around the fact that `foo::bar` parses as a valid URL
+        if !url.cannot_be_a_base() {
+            span_lint(cx,
+                      DOC_MARKDOWN,
+                      span,
+                      "you should put bare URLs between `<`/`>` or make a proper Markdown link");
+
+            return;
+        }
+    }
+
     if has_underscore(word) || word.contains("::") || is_camel_case(word) {
         span_lint(
             cx,

tests/ui/doc.rs

@@ -162,5 +162,8 @@ fn issue_1920() {}
 
 /// Ok: <http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels>
 ///
+/// Not ok: http://www.unicode.org
+/// Not ok: https://www.unicode.org
+/// Not ok: http://www.unicode.org/
 /// Not ok: http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels
 fn issue_1832() {}

tests/ui/doc.stderr

@@ -156,11 +156,29 @@ error: you should put `be_sure_we_got_to_the_end_of_it` between ticks in the doc
 138 | /// be_sure_we_got_to_the_end_of_it
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: you should put `http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels` between ticks in the documentation
+error: you should put bare URLs between `<`/`>` or make a proper Markdown link
    --> $DIR/doc.rs:165:13
     |
-165 | /// Not ok: http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels
+165 | /// Not ok: http://www.unicode.org
+    |             ^^^^^^^^^^^^^^^^^^^^^^
+
+error: you should put bare URLs between `<`/`>` or make a proper Markdown link
+   --> $DIR/doc.rs:166:13
+    |
+166 | /// Not ok: https://www.unicode.org
+    |             ^^^^^^^^^^^^^^^^^^^^^^^
+
+error: you should put bare URLs between `<`/`>` or make a proper Markdown link
+   --> $DIR/doc.rs:167:13
+    |
+167 | /// Not ok: http://www.unicode.org/
+    |             ^^^^^^^^^^^^^^^^^^^^^^
+
+error: you should put bare URLs between `<`/`>` or make a proper Markdown link
+   --> $DIR/doc.rs:168:13
+    |
+168 | /// Not ok: http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels
     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 27 previous errors
+error: aborting due to 30 previous errors