feat: language support in ---@usage

Author: numToStr

src/vimdoc/usage.rs

@@ -10,10 +10,10 @@ impl ToDoc for UsageDoc {
     fn to_doc(n: &Self::N, _: &super::Settings) -> String {
         let mut doc = String::new();
         doc.push_str(&description("Usage: ~"));
-        doc.push_str("        >\n");
+        doc.push_str(">lua\n");
         doc.push_str(&textwrap::indent(&n.code, "            "));
         doc.push('\n');
-        doc.push_str("        <\n\n");
+        doc.push_str("<\n\n");
         doc
     }
 }

tests/basic.rs

@@ -260,9 +260,9 @@ U.sub({this}, {that})                                                    *U.sub*
                   we don't know about
 
     Usage: ~
-        >
+>lua
             require('module.U').sub(10, 5)
-        <
+<
 
 
 U.magical({this}, {that})                                            *U.magical*
@@ -469,12 +469,12 @@ U:create()                                                            *U:create*
         (Human)
 
     Usage: ~
-        >
+>lua
             local H = require('Human')
             local human = H:create()
 
             print(getmetatable(human))
-        <
+<
 
 
 ================================================================================
@@ -614,9 +614,9 @@ U.VMODE                                                                *U.VMODE*
         (VMode)
 
     Usage: ~
-        >
+>lua
             print(require('plugin').VMODE)
-        <
+<
 
 
 "#

tests/with_settings.rs

@@ -68,9 +68,9 @@ U:create()                                                            *U:create*
         (number)
 
     Usage: ~
-        >
+>lua
             require('Pi'):create()
-        <
+<
 
 
 "
@@ -126,9 +126,9 @@ U:create()                                                      *awesome:create*
         (number)
 
     Usage: ~
-        >
+>lua
             require('Pi'):create()
-        <
+<
 
 
 "