patch 9.0.2062: Janet files are not recognised

Problem:  Janet files are not recognised
Solution: Add filename and shebang detection (without
          adding an extra filetype plugin)

Those are used by the Janet language:
http://www.janet-lang.org

closes: #13400

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Doug Kearns <dougkearns@gmail.com>

runtime/autoload/dist/script.vim

@@ -217,6 +217,10 @@ export def Exe2filetype(name: string, line1: string): string
   elseif name =~ '^\%(rexx\|regina\)\>'
     return 'rexx'
 
+    # Janet
+  elseif name =~ '^janet\>'
+    return 'janet'
+
   endif
 
   return ''

runtime/filetype.vim

@@ -1034,6 +1034,9 @@ au BufNewFile,BufRead *.jal,*.JAL		setf jal
 " Jam
 au BufNewFile,BufRead *.jpl,*.jpr		setf jam
 
+" Janet
+au BufNewFile,BufRead *.janet			setf janet
+
 " Java
 au BufNewFile,BufRead *.java,*.jav		setf java
 

src/testdir/test_filetype.vim

@@ -335,6 +335,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     j: ['file.ijs'],
     jal: ['file.jal', 'file.JAL'],
     jam: ['file.jpl', 'file.jpr', 'JAM-file.file', 'JAM.file', 'Prl-file.file', 'Prl.file'],
+    janet: ['file.janet'],
     java: ['file.java', 'file.jav'],
     javacc: ['file.jj', 'file.jjt'],
     javascript: ['file.js', 'file.jsm', 'file.javascript', 'file.es', 'file.mjs', 'file.cjs'],
@@ -953,6 +954,7 @@ def s:GetScriptChecks(): dict<list<list<string>>>
     crystal: [['#!/path/crystal']],
     rexx:   [['#!/path/rexx'],
             ['#!/path/regina']],
+    janet: [['#!/path/janet']],
   }
 enddef
 

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2062,
 /**/
     2061,
 /**/