1 files changed, 82 insertions, 0 deletions
diff --git a/runtime/ftplugin/mf.vim b/runtime/ftplugin/mf.vim
new file mode 100644
index 0000000..5c8c571
--- /dev/null
+++ b/runtime/ftplugin/mf.vim
@@ -0,0 +1,82 @@
+vim9script
+
+# Vim filetype plugin file
+# Language:           METAFONT
+# Maintainer:         Nicola Vitacolonna <nvitacolonna@gmail.com>
+# Former Maintainers: Nikolai Weibull <now@bitwi.se>
+# Latest Revision:    2022 Aug 12
+
+if exists("b:did_ftplugin")
+  finish
+endif
+
+b:did_ftplugin = 1
+b:undo_ftplugin = "setl com< cms< fo< sua< inc< def< ofu<"
+
+setlocal comments=:%
+setlocal commentstring=%\ %s
+setlocal formatoptions+=cjroql2
+setlocal formatoptions-=t
+setlocal omnifunc=syntaxcomplete#Complete
+setlocal suffixesadd=.mf
+
+&l:include = '\<input\>'
+&l:define = '\<\%(let\|newinternal\|interim\|def\|vardef\)\>\|\<\%(primary\|secondary\|tertiary\)def\>\s*[^ .]\+'
+
+g:omni_syntax_group_include_mf = 'mf\w\+'
+g:omni_syntax_group_exclude_mf = 'mfTodoComment'
+
+if exists("g:loaded_matchit") && !exists("b:match_words")
+  b:match_ignorecase = 0
+  b:match_skip = 'synIDattr(synID(line("."), col("."), 1), "name") =~# "mf\\(Comment\\|String\\)$"'
+  b:match_words = '\<if\>:\<else\%[if]\>:\<fi\>,'
+  ..              '\<for\%(\|suffixes\|ever\)\>:\<exit\%(if\|unless\)\>:\<endfor\>,'
+  ..              '\<\%(\|var\|primary\|secondary\|tertiary\)def\>:\<enddef\>,'
+  ..              '\<begingroup\>:\<endgroup\>,'
+  ..              '\<begin\%(logo\)\?char\>:\<endchar\>'
+  b:undo_ftplugin ..= "| unlet! b:match_ignorecase b:match_words b:match_skip"
+endif
+
+if !get(g:, 'no_mf_maps', 0) && !get(g:, 'no_plugin_maps', 0)
+  const mf_regex = {
+    'beginsection': '^\s*\%(\%(\|var\|primary\|secondary\|tertiary\)def\|beginchar\|beginlogochar\)\>',
+    'endsection':   '^\s*\%(enddef\|endchar\)\>',
+    'beginblock':   '^\s*\%(begingroup\|if\|for\%(\|suffixes\|ever\)\)\>',
+    'endblock':     '^\s*\%(endgroup\|fi\|endfor\)\>'}
+
+  def MoveAround(count: number, what: string, flags: string)
+    search(mf_regex[what], flags .. 's')  # 's' sets previous context mark
+    var i = 2
+    while i <= count
+      search(mf_regex[what], flags)
+      i += 1
+    endwhile
+  enddef
+
+  # Macros to move around
+  nnoremap <silent><buffer> [[ <scriptcmd>MoveAround(v:count1, "beginsection", "bW")<cr>
+  vnoremap <silent><buffer> [[ <scriptcmd>MoveAround(v:count1, "beginsection", "bW")<cr>
+  nnoremap <silent><buffer> ]] <scriptcmd>MoveAround(v:count1, "beginsection", "W") <cr>
+  vnoremap <silent><buffer> ]] <scriptcmd>MoveAround(v:count1, "beginsection", "W") <cr>
+  nnoremap <silent><buffer> [] <scriptcmd>MoveAround(v:count1, "endsection",   "bW")<cr>
+  vnoremap <silent><buffer> [] <scriptcmd>MoveAround(v:count1, "endsection",   "bW")<cr>
+  nnoremap <silent><buffer> ][ <scriptcmd>MoveAround(v:count1, "endsection",   "W") <cr>
+  vnoremap <silent><buffer> ][ <scriptcmd>MoveAround(v:count1, "endsection",   "W") <cr>
+  nnoremap <silent><buffer> [{ <scriptcmd>MoveAround(v:count1, "beginblock",   "bW")<cr>
+  vnoremap <silent><buffer> [{ <scriptcmd>MoveAround(v:count1, "beginblock",   "bW")<cr>
+  nnoremap <silent><buffer> ]} <scriptcmd>MoveAround(v:count1, "endblock",     "W") <cr>
+  vnoremap <silent><buffer> ]} <scriptcmd>MoveAround(v:count1, "endblock",     "W") <cr>
+
+  for mapping in ["[[", "]]", "[]", "][", "[{", "]}"]
+    b:undo_ftplugin ..= printf(" | silent! execute 'nunmap <buffer> %s'", mapping)
+    b:undo_ftplugin ..= printf(" | silent! execute 'vunmap <buffer> %s'", mapping)
+  endfor
+endif
+
+if (has('gui_win32') || has('gui_gtk')) && !exists('b:browsefilter')
+  b:browsefilter = "METAFONT Source Files (*.mf)\t*.mf\n"
+  ..                   "All Files (*.*)\t*.*\n"
+  b:undo_ftplugin ..= ' | unlet! b:browsefilter'
+endif
+
+# vim: sw=2 fdm=marker