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+" Vim filetype plugin file (GUI menu and folding)
+" Language: Debian control files
+" Maintainer: Debian Vim Maintainers
+" Former Maintainer: Pierre Habouzit <madcoder@debian.org>
+" Last Change: 2023 Jan 16
+" URL: https://salsa.debian.org/vim-team/vim-debian/blob/main/ftplugin/debcontrol.vim
+
+" Do these settings once per buffer
+if exists('b:did_ftplugin')
+ finish
+endif
+let b:did_ftplugin=1
+
+" {{{1 Local settings (do on every load)
+if exists('g:debcontrol_fold_enable')
+ setlocal foldmethod=expr
+ setlocal foldexpr=DebControlFold(v:lnum)
+ setlocal foldtext=DebControlFoldText()
+endif
+setlocal textwidth=0
+
+" Clean unloading
+let b:undo_ftplugin = 'setlocal tw< foldmethod< foldexpr< foldtext<'
+
+" }}}1
+
+" {{{1 folding
+
+function! s:getField(f, lnum)
+ let line = getline(a:lnum)
+ let fwdsteps = 0
+ while line !~ '^'.a:f.':'
+ let fwdsteps += 1
+ let line = getline(a:lnum + fwdsteps)
+ if line ==# ''
+ return 'unknown'
+ endif
+ endwhile
+ return substitute(line, '^'.a:f.': *', '', '')
+endfunction
+
+function! DebControlFoldText()
+ if v:folddashes ==# '-' " debcontrol entry fold
+ let type = substitute(getline(v:foldstart), ':.*', '', '')
+ if type ==# 'Source'
+ let ftext = substitute(foldtext(), ' *Source: *', ' ', '')
+ return ftext . ' -- ' . s:getField('Maintainer', v:foldstart) . ' '
+ endif
+ let arch = s:getField('Architecture', v:foldstart)
+ let ftext = substitute(foldtext(), ' *Package: *', ' [' . arch . '] ', '')
+ return ftext . ': ' . s:getField('Description', v:foldstart) . ' '
+ endif
+ return foldtext()
+endfunction
+
+function! DebControlFold(l)
+
+ " This is for not merging blank lines around folds to them
+ if getline(a:l) =~# '^Source:'
+ return '>1'
+ endif
+
+ if getline(a:l) =~# '^Package:'
+ return '>1'
+ endif
+
+ return '='
+endfunction
+
+" }}}1