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" Copyright 2011 The Go Authors. All rights reserved.
" Use of this source code is governed by a BSD-style
" license that can be found in the LICENSE file.
"
" fmt.vim: Vim command to format Go files with gofmt.
"
" This filetype plugin add a new commands for go buffers:
"
" :Fmt
"
" Filter the current Go buffer through gofmt.
" It tries to preserve cursor position and avoids
" replacing the buffer with stderr output.
"
" Options:
"
" g:go_fmt_commands [default=1]
"
" Flag to indicate whether to enable the commands listed above.
"
" g:gofmt_command [default="gofmt"]
"
" Flag naming the gofmt executable to use.
"
if exists("b:did_ftplugin_go_fmt")
    finish
endif

if !exists("g:go_fmt_commands")
    let g:go_fmt_commands = 1
endif

if !exists("g:gofmt_command")
    let g:gofmt_command = "gofmt"
endif

if g:go_fmt_commands
    command! -buffer Fmt call s:GoFormat()
endif

function! s:GoFormat()
    let view = winsaveview()
    silent execute "%!" . g:gofmt_command
    if v:shell_error
        let errors = []
        for line in getline(1, line('$'))
            let tokens = matchlist(line, '^\(.\{-}\):\(\d\+\):\(\d\+\)\s*\(.*\)')
            if !empty(tokens)
                call add(errors, {"filename": @%,
                                 \"lnum": tokens[2],
                                 \"col": tokens[3],
                                 \"text": tokens[4]})
            endif
        endfor
        if empty(errors)
            % | " Couldn't detect gofmt error format, output errors
        endif
        undo
        if !empty(errors)
            call setqflist(errors, 'r')
        endif
        echohl Error | echomsg "Gofmt returned error" | echohl None
    endif
    call winrestview(view)
endfunction

let b:did_ftplugin_go_fmt = 1

" vim:ts=4:sw=4:et
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