"=============================================================================
" Copyright (c) 2007-2009 Takeshi NISHIDA
"
"=============================================================================
" LOAD GUARD {{{1

if exists('g:loaded_autoload_fuf_tag') || v:version < 702
  finish
endif
let g:loaded_autoload_fuf_tag = 1

" }}}1
"=============================================================================
" GLOBAL FUNCTIONS {{{1

"
function fuf#tag#createHandler(base)
  return a:base.concretize(copy(s:handler))
endfunction

"
function fuf#tag#getSwitchOrder()
  return g:fuf_tag_switchOrder
endfunction

"
function fuf#tag#renewCache()
  let s:cache = {}
endfunction

"
function fuf#tag#requiresOnCommandPre()
  return 0
endfunction

"
function fuf#tag#onInit()
  call fuf#defineLaunchCommand('FufTag'              , s:MODE_NAME, '""')
  call fuf#defineLaunchCommand('FufTagWithCursorWord', s:MODE_NAME, 'expand(''<cword>'')')
endfunction

" }}}1
"=============================================================================
" LOCAL FUNCTIONS/VARIABLES {{{1

let s:MODE_NAME = expand('<sfile>:t:r')

"
function s:getTagNames(tagFile)
  let names = map(readfile(a:tagFile), 'matchstr(v:val, ''^[^!\t][^\t]*'')')
  return filter(names, 'v:val =~# ''\S''')
endfunction

"
function s:parseTagFiles(tagFiles)
  if !empty(g:fuf_tag_cache_dir)
    if !isdirectory(expand(g:fuf_tag_cache_dir))
      call mkdir(expand(g:fuf_tag_cache_dir), 'p')
    endif
    " NOTE: fnamemodify('a/b', ':p') returns 'a/b/' if the directory exists.
    let cacheFile = fnamemodify(g:fuf_tag_cache_dir, ':p')
          \ . fuf#hash224(join(a:tagFiles, "\n"))
    if filereadable(cacheFile) && fuf#countModifiedFiles(a:tagFiles, getftime(cacheFile)) == 0
      return map(readfile(cacheFile), 'eval(v:val)')
    endif
  endif
  let items = fuf#unique(fuf#concat(map(copy(a:tagFiles), 's:getTagNames(v:val)')))
  let items = map(items, 'fuf#makeNonPathItem(v:val, "")')
  call fuf#mapToSetSerialIndex(items, 1)
  let items = map(items, 'fuf#setAbbrWithFormattedWord(v:val, 1)')
  if !empty(g:fuf_tag_cache_dir)
    call writefile(map(copy(items), 'string(v:val)'), cacheFile)
  endif
  return items
endfunction

"
function s:enumTags(tagFiles)
  if !len(a:tagFiles)
    return []
  endif
  let key = join(a:tagFiles, "\n")
  if !exists('s:cache[key]') || fuf#countModifiedFiles(a:tagFiles, s:cache[key].time)
    let s:cache[key] = {
          \   'time'  : localtime(),
          \   'items' : s:parseTagFiles(a:tagFiles)
          \ }
  endif
  return s:cache[key].items
endfunction

"
function s:getMatchingIndex(lines, cmd)
  if a:cmd !~# '\D'
    return str2nr(a:cmd)
  endif
  let pattern = matchstr(a:cmd, '^\/\^\zs.*\ze\$\/$')
  if empty(pattern)
    return -1
  endif
  for i in range(len(a:lines))
    if a:lines[i] ==# pattern
      return i
    endif
  endfor
  return -1
endfunction

" }}}1
"=============================================================================
" s:handler {{{1

let s:handler = {}

"
function s:handler.getModeName()
  return s:MODE_NAME
endfunction

"
function s:handler.getPrompt()
  return fuf#formatPrompt(g:fuf_tag_prompt, self.partialMatching)
endfunction

"
function s:handler.getPreviewHeight()
  return g:fuf_previewHeight
endfunction

"
function s:handler.targetsPath()
  return 0
endfunction

"
function s:handler.makePatternSet(patternBase)
  return fuf#makePatternSet(a:patternBase, 's:interpretPrimaryPatternForNonPath',
        \                   self.partialMatching)
endfunction

" 'cmd' is '/^hoge hoge$/' or line number
function s:handler.makePreviewLines(word, count)
  let tags = taglist('^' . a:word . '$')
  if empty(tags)
    return []
  endif
  let i = a:count % len(tags)
  let title = printf('(%d/%d) %s', i + 1, len(tags), tags[i].filename)
  let lines = fuf#getFileLines(tags[i].filename)
  let index = s:getMatchingIndex(lines, tags[i].cmd)
  return [title] + fuf#makePreviewLinesAround(
        \ lines, (index < 0 ? [] : [index]), 0, self.getPreviewHeight() - 1)
endfunction

"
function s:handler.getCompleteItems(patternPrimary)
  return s:enumTags(self.tagFiles)
endfunction

"
function s:handler.onOpen(word, mode)
  call fuf#openTag(a:word, a:mode)
endfunction

"
function s:handler.onModeEnterPre()
  let self.tagFiles = fuf#getCurrentTagFiles()
endfunction

"
function s:handler.onModeEnterPost()
  let &l:tags = join(self.tagFiles, ',')
endfunction

"
function s:handler.onModeLeavePost(opened)
  let &l:tags = ''
endfunction

" }}}1
"=============================================================================
" vim: set fdm=marker: