neovim/runtime/ftplugin/java.vim

" Vim filetype plugin file
" Language:		Java
" Maintainer:		Aliaksei Budavei <0x000c70 AT gmail DOT com>
" Former Maintainer:	Dan Sharp
" Repository:		https://github.com/zzzyxwvut/java-vim.git
" Last Change:		2024 Apr 18
"			2024 Jan 14 by Vim Project (browsefilter)
"			2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')

if exists("b:did_ftplugin") | finish | endif
let b:did_ftplugin = 1

" Make sure the continuation lines below do not cause problems in
" compatibility mode.
let s:save_cpo = &cpo
set cpo-=C

" For filename completion, prefer the .java extension over the .class
" extension.
set suffixes+=.class

" Enable gf on import statements.  Convert . in the package
" name to / and append .java to the name, then search the path.
setlocal includeexpr=substitute(v:fname,'\\.','/','g')
setlocal suffixesadd=.java

" Clean up in case this file is sourced again.
unlet! s:zip_func_upgradable

" Documented in ":help ft-java-plugin".
if exists("g:ftplugin_java_source_path") &&
		\ type(g:ftplugin_java_source_path) == type("")
    if filereadable(g:ftplugin_java_source_path)
	if exists("#zip") &&
		    \ g:ftplugin_java_source_path =~# '.\.\%(jar\|zip\)$'
	    if !exists("s:zip_files")
		let s:zip_files = {}
	    endif

	    let s:zip_files[bufnr('%')] = g:ftplugin_java_source_path
	    let s:zip_files[0] = g:ftplugin_java_source_path
	    let s:zip_func_upgradable = 1

	    function! JavaFileTypeZipFile() abort
		let @/ = substitute(v:fname, '\.', '\\/', 'g') . '.java'
		return get(s:zip_files, bufnr('%'), s:zip_files[0])
	    endfunction

	    " E120 for "inex=s:JavaFileTypeZipFile()" before v8.2.3900.
	    setlocal includeexpr=JavaFileTypeZipFile()
	    setlocal suffixesadd<
	endif
    else
	let &l:path = g:ftplugin_java_source_path . ',' . &l:path
    endif
endif

" Set 'formatoptions' to break comment lines but not other lines,
" and insert the comment leader when hitting <CR> or using "o".
setlocal formatoptions-=t formatoptions+=croql

" Set 'comments' to format dashed lists in comments. Behaves just like C.
setlocal comments& comments^=sO:*\ -,mO:*\ \ ,exO:*/

setlocal commentstring=//\ %s

" Change the :browse e filter to primarily show Java-related files.
if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
    let  b:browsefilter="Java Files (*.java)\t*.java\n" .
		\	"Properties Files (*.prop*)\t*.prop*\n" .
		\	"Manifest Files (*.mf)\t*.mf\n"
    if has("win32")
	let b:browsefilter .= "All Files (*.*)\t*\n"
    else
	let b:browsefilter .= "All Files (*)\t*\n"
    endif
endif

" Undo the stuff we changed.
let b:undo_ftplugin = "setlocal suffixes< suffixesadd<" .
		\     " formatoptions< comments< commentstring< path< includeexpr<" .
		\     " | unlet! b:browsefilter"

" See ":help vim9-mix".
if !has("vim9script")
    let &cpo = s:save_cpo
    unlet s:save_cpo
    finish
endif

if exists("s:zip_func_upgradable")
    delfunction! JavaFileTypeZipFile

    def! s:JavaFileTypeZipFile(): string
	@/ = substitute(v:fname, '\.', '\\/', 'g') .. '.java'
	return get(zip_files, bufnr('%'), zip_files[0])
    enddef

    setlocal includeexpr=s:JavaFileTypeZipFile()
    setlocal suffixesadd<
endif

" Restore the saved compatibility options.
let &cpo = s:save_cpo
unlet s:save_cpo