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251 lines
8.3 KiB
VimL
251 lines
8.3 KiB
VimL
11 years ago
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" Copyright 2011 The Go Authors. All rights reserved.
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" Use of this source code is governed by a BSD-style
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" license that can be found in the LICENSE file.
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"
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" import.vim: Vim commands to import/drop Go packages.
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"
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" This filetype plugin adds three new commands for go buffers:
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"
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" :Import {path}
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"
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" Import ensures that the provided package {path} is imported
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" in the current Go buffer, using proper style and ordering.
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" If {path} is already being imported, an error will be
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" displayed and the buffer will be untouched.
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"
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" :ImportAs {localname} {path}
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"
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" Same as Import, but uses a custom local name for the package.
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"
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" :Drop {path}
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"
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" Remove the import line for the provided package {path}, if
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" present in the current Go buffer. If {path} is not being
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" imported, an error will be displayed and the buffer will be
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" untouched.
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"
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" If you would like to add shortcuts, you can do so by doing the following:
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"
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" Import fmt
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" au Filetype go nnoremap <buffer> <LocalLeader>f :Import fmt<CR>
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"
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" Drop fmt
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" au Filetype go nnoremap <buffer> <LocalLeader>F :Drop fmt<CR>
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"
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" Import the word under your cursor
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" au Filetype go nnoremap <buffer> <LocalLeader>k
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" \ :exe 'Import ' . expand('<cword>')<CR>
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"
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" The backslash '\' is the default maplocalleader, so it is possible that
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" your vim is set to use a different character (:help maplocalleader).
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"
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" Options:
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"
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" g:go_import_commands [default=1]
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"
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" Flag to indicate whether to enable the commands listed above.
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"
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if exists("b:did_ftplugin_go_import")
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finish
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endif
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if !exists("g:go_import_commands")
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let g:go_import_commands = 1
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endif
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if g:go_import_commands
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command! -buffer -nargs=? -complete=customlist,go#complete#Package Drop call s:SwitchImport(0, '', <f-args>)
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command! -buffer -nargs=1 -complete=customlist,go#complete#Package Import call s:SwitchImport(1, '', <f-args>)
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command! -buffer -nargs=* -complete=customlist,go#complete#Package ImportAs call s:SwitchImport(1, <f-args>)
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endif
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function! s:SwitchImport(enabled, localname, path)
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let view = winsaveview()
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let path = a:path
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" Quotes are not necessary, so remove them if provided.
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if path[0] == '"'
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let path = strpart(path, 1)
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endif
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if path[len(path)-1] == '"'
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let path = strpart(path, 0, len(path) - 1)
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endif
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if path == ''
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call s:Error('Import path not provided')
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return
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endif
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" Extract any site prefix (e.g. github.com/).
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" If other imports with the same prefix are grouped separately,
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" we will add this new import with them.
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" Only up to and including the first slash is used.
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let siteprefix = matchstr(path, "^[^/]*/")
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let qpath = '"' . path . '"'
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if a:localname != ''
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let qlocalpath = a:localname . ' ' . qpath
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else
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let qlocalpath = qpath
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endif
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let indentstr = 0
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let packageline = -1 " Position of package name statement
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let appendline = -1 " Position to introduce new import
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let deleteline = -1 " Position of line with existing import
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let linesdelta = 0 " Lines added/removed
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" Find proper place to add/remove import.
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let line = 0
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while line <= line('$')
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let linestr = getline(line)
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if linestr =~# '^package\s'
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let packageline = line
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let appendline = line
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elseif linestr =~# '^import\s\+('
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let appendstr = qlocalpath
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let indentstr = 1
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let appendline = line
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let firstblank = -1
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let lastprefix = ""
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while line <= line("$")
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let line = line + 1
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let linestr = getline(line)
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let m = matchlist(getline(line), '^\()\|\(\s\+\)\(\S*\s*\)"\(.\+\)"\)')
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if empty(m)
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if siteprefix == "" && a:enabled
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" must be in the first group
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break
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endif
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" record this position, but keep looking
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if firstblank < 0
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let firstblank = line
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endif
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continue
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endif
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if m[1] == ')'
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" if there's no match, add it to the first group
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if appendline < 0 && firstblank >= 0
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let appendline = firstblank
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endif
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break
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endif
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let lastprefix = matchstr(m[4], "^[^/]*/")
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if a:localname != '' && m[3] != ''
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let qlocalpath = printf('%-' . (len(m[3])-1) . 's %s', a:localname, qpath)
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endif
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let appendstr = m[2] . qlocalpath
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let indentstr = 0
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if m[4] == path
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let appendline = -1
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let deleteline = line
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break
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elseif m[4] < path
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" don't set candidate position if we have a site prefix,
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" we've passed a blank line, and this doesn't share the same
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" site prefix.
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if siteprefix == "" || firstblank < 0 || match(m[4], "^" . siteprefix) >= 0
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let appendline = line
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endif
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elseif siteprefix != "" && match(m[4], "^" . siteprefix) >= 0
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" first entry of site group
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let appendline = line - 1
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break
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endif
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endwhile
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break
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elseif linestr =~# '^import '
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if appendline == packageline
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let appendstr = 'import ' . qlocalpath
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let appendline = line - 1
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endif
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let m = matchlist(linestr, '^import\(\s\+\)\(\S*\s*\)"\(.\+\)"')
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if !empty(m)
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if m[3] == path
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let appendline = -1
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let deleteline = line
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break
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endif
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if m[3] < path
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let appendline = line
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endif
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if a:localname != '' && m[2] != ''
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let qlocalpath = printf("%s %" . len(m[2])-1 . "s", a:localname, qpath)
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endif
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let appendstr = 'import' . m[1] . qlocalpath
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endif
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elseif linestr =~# '^\(var\|const\|type\|func\)\>'
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break
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endif
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let line = line + 1
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endwhile
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" Append or remove the package import, as requested.
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if a:enabled
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if deleteline != -1
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call s:Error(qpath . ' already being imported')
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elseif appendline == -1
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call s:Error('No package line found')
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else
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if appendline == packageline
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call append(appendline + 0, '')
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call append(appendline + 1, 'import (')
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call append(appendline + 2, ')')
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let appendline += 2
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let linesdelta += 3
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let appendstr = qlocalpath
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let indentstr = 1
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endif
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call append(appendline, appendstr)
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execute appendline + 1
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if indentstr
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execute 'normal >>'
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endif
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let linesdelta += 1
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endif
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else
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if deleteline == -1
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call s:Error(qpath . ' not being imported')
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else
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execute deleteline . 'd'
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let linesdelta -= 1
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if getline(deleteline-1) =~# '^import\s\+(' && getline(deleteline) =~# '^)'
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" Delete empty import block
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let deleteline -= 1
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execute deleteline . "d"
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execute deleteline . "d"
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let linesdelta -= 2
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endif
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if getline(deleteline) == '' && getline(deleteline - 1) == ''
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" Delete spacing for removed line too.
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execute deleteline . "d"
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let linesdelta -= 1
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endif
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endif
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endif
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" Adjust view for any changes.
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let view.lnum += linesdelta
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let view.topline += linesdelta
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if view.topline < 0
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let view.topline = 0
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endif
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" Put buffer back where it was.
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call winrestview(view)
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endfunction
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function! s:Error(s)
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echohl Error | echo a:s | echohl None
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endfunction
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let b:did_ftplugin_go_import = 1
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" vim:ts=4:sw=4:et
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