*pi_netrw.txt*  For Vim version 6.2b.  Last change: Apr 03, 2003


		  VIM REFERENCE MANUAL    by Charles E. Campbell, Jr.

*ftp* *http* *scp* *rcp* *Nread* *Nwrite* *netrw* *netrw.vim* *network*

Network-Oriented File Transfers with Vim

1. Network-Oriented File Transfer			|netrw-xfer|
2. Activation						|netrw-activate|
3. Ex Commands						|netrw-ex|
4. Variables						|netrw-var|
5. User Options						|netrw-options|
6. Debugging						|netrw-debug|

The functionality mentioned here is done via using |standard-plugin|
techniques.  This plugin is only available if

    set nocp                    " 'compatible' is not set
    filetype plugin on          " plugins are enabled

You can avoid loading this plugin by setting the "loaded_netrw" variable: >

	:let loaded_netrw = 1

{Vi does not have any of this}

==============================================================================
1. Network-Oriented File Transfer			*netrw-xfer*

Network-oriented file transfer under Vim is implemented by a VimL-based
script (<netrw.vim>) using plugin techniques.  It currently supports both
reading and writing across networks using rcp, scp, ftp or ftp+<.netrc>,
dav/cadaver, or rsync.

http is currently supported read-only by using wget.

Ftp, an old protocol, seems to be blessed by numerous implementations.
Unfortunately, some implementations are noisy (ie., add junk to the end of the
file).  Thus, concerned users may decide to write a NetReadFixup() function
that will clean up after reading with their ftp.  Some Unix systems (ie.,
FreeBSD) provide a utility called "fetch" which uses the ftp protocol but is
not noisy and more convenient, actually, for <netrw.vim> to use.
Consequently, if "fetch" is executable, it will be used to do reads for
ftp://... (and http://...) .  See |netrw-var| for more about this.

For rcp, scp, and http, one may use network-oriented file transfers
transparently; ie.
>
	vim rcp://[user@]machine/path
	vim scp://[user@]machine/path
<
If your ftp supports <.netrc>, then it too can be just as transparently used
if the needed triad of machine name, user id, and password are present in that
file.  Your ftp must be able to use the <.netrc> file on its own, however.
>
	vim ftp://[user@]machine/path
<
However, ftp will often need to query the user for the userid and password.
The latter will be done "silently"; ie. asterisks will show up instead of the
actually-typed-in password.  Netrw will retain the userid and password for
subsequent read/writes from the most recent transfer so subsequent transfers
(read/write) to or from that machine will take place without additional
prompting.

   +==============================+==============================+============+
   |  Reading                     | Writing                      |  Uses      |
   +==============================+==============================+============+
   | RCP:                         |                              |            |
   |  rcp://[user@]machine/path   | rcp://[user@]machine/path    |  rcp       |
   |  :Nread rcp://machine/path   | :Nwrite rcp://machine/path   |  rcp       |
   +------------------------------+------------------------------+------------+
   | SCP:                         |                              |            |
   |  scp://[user@]machine/path   | scp://[user@]machine/path    |  scp       |
   |  :Nread scp://machine/path   | :Nwrite scp://machine/path   |  scp  (*1) |
   +------------------------------+------------------------------+------------+
   | FTP:                         |                              |            |
   |  ftp://[user@]machine/path   | ftp://[user@]machine/path    |  ftp  (*2) |
   |  :Nread ftp://machine/path   | :Nwrite ftp://machine/path   |  ftp+.netrc|
   |  :Nread machine path         | :Nwrite machine path         |  ftp+.netrc|
   |  :Nread machine uid pass path| :Nwrite machine uid pass path|  ftp       |
   +------------------------------+------------------------------+------------+
   | FTP: if fetch is present...  |                              |            |
   |  ftp://[user@]machine/path   | ftp://[user@]machine/path    |  fetch     |
   +------------------------------+------------------------------+------------+
   | HTTP:                        |                              |            |
   |  http://[user@]machine/path  |                              |  wget      |
   |  :Nread http://machine/path  |                              |  wget      |
   +------------------------------+------------------------------+------------+
   | HTTP: if fetch is present... |                              |            |
   |  http://[user@]machine/path  |                              |  fetch     |
   +------------------------------+------------------------------+------------+
   | DAV:                         |                              |            |
   |  dav://machine/path          |                              |  cadaver   |
   |  :Nread dav://machine/path   | :Nwrite dav://machine/path   |  cadaver   |
   +------------------------------+------------------------------+------------+
   | RSYNC:                       |                              |            |
   |  rsync://[user@]machine/path | rsync://[user@]machine/path  |  rsync     |
   |  :Nread rsync://machine/path | :Nwrite rsync://machine/path |  rsync     |
   +==============================+==============================+============+
	(*1) For an absolute path use scp://machine//path.
	(*2) if <.netrc> is present, it is assumed that it will
	     work with your ftp client.  Otherwise the script will
	     prompt for user-id and pasword.
        (*3) for ftp, "machine" may be machine#port if a different
             port is needed than the standard ftp port

Both the :Nread and the :Nwrite ex-commands can accept multiple filenames.


NETRC							*netrw-netrc*

The typical syntax for lines in a <.netrc> file is given as shown below.
Ftp under Unix usually support <.netrc>; Windows' ftp usually doesn't.
>
	machine {full machine name} login {user-id} password "{password}"
	default			    login {user-id} password "{password}"

Your ftp client must handle the use of <.netrc> on its own, but if the
<.netrc> file exists, an ftp transfer will not ask for the user-id or
password.

	Note:
	Since this file contains passwords, make very sure nobody else can
	read this file!  Most programs will refuse to use a .netrc that is
	readable for others.  Don't forget that the system administrator can
	still read the file!


PASSWORD						*netrw-passwd*

The script attempts to get passwords for ftp invisibly using |inputsecret()|,
a built-in Vim function.  See |netrw-uidpass| for how to change the password
after one has set it.


==============================================================================
2. Activation						*netrw-activate*

Network-oriented file transfers are available by default whenever
|'nocompatible'| mode is enabled.  The <netrw.vim> file resides in your
system's vim-plugin directory and is sourced automatically whenever you bring
up vim.


TRANSPARENT FILE TRANSFER				*netrw-transparent*

Transparent file transfers occur whenever a regular file read or write
(invoked via an |:autocmd| for |BufReadCmd| or |BufWriteCmd| events) is
made.  Thus one may use files across networks as if they were local. >

	vim ftp://[user@]machine/path
	...
	:wq


==============================================================================
3. Ex Commands						*netrw-ex*

The usual read/write commands are supported.  There are also a couple of
additional commands available.

:[range]Nw
				Write the specified lines to the current
				file as specified in b:netrw_lastfile.

:[range]Nw {netfile} [{netfile}]...
				Write the specified lines to the {netfile}.

:Nread
				Read the specified lines into the current
				buffer from the file specified in
				b:netrw_lastfile.

:Nread {netfile} {netfile}...
				Read the {netfile} after the current line.

									*netrw-uidpass*
:call NetUserPass()
				If b:netrw_uid and b:netrw_passwd don't exist,
				this function query the user for them.

:call NetUserPass("userid")
				This call will set the b:netrw_uid and, if
				the password doesn't exist, will query the user for it.

:call NetUserPass("userid","passwd")
				This call will set both the b:netrw_uid and b:netrw_passwd.
				The user-id and password are used by ftp transfers.  One may
				effectively remove the user-id and password by using ""
				strings.


==============================================================================
4. Variables						*netrw-var*

The script <netrw.vim> uses several variables which can affect <netrw.vim>'s
behavior.  These variables are typically set in the user's <.vimrc> file:

        g:netrw_uid             Holds current user-id for ftp.
        g:netrw_passwd          Holds current password for ftp.
        b:netrw_lastfile        Holds latest method/machine/path.
        b:netrw_line            Holds current line number     (during NetWrite)
        b:netrw_col             Holds current cursor position (during NetWrite)
        g:netrw_ftp             =0 use default ftp            (uid password)
                                =1 use alternate ftp          (user uid password)
                                (see |netrw-options|)
        g:netrw_ftpmode         ="binary"                     (default)
                                ="ascii"                      (your choice)
        g:netrw_win95ftp        =0 use unix-style ftp even if win95/98/ME/etc
                                =1 use default method to do ftp
        g:netrw_cygwin          =1 assume scp under windows is from cygwin
                                                              (default/windows)
                                =0 assume scp under windows accepts windows
                                   style paths                (default/else)
        g:netrw_use_nt_rcp      =0 don't use WinNT/2K/XP's rcp (default)
                                =1 use WinNT/2K/XP's rcp, binary mode

The following variables specify the external program to use handle the associated
protocol (rcp, ftp, etc), plus any options.  Again, the user may vary these
at will:

        g:netrw_rcp_cmd         ="rcp"
        g:netrw_ftp_cmd         ="ftp"
        g:netrw_scp_cmd         ="scp -q"
        g:netrw_http_cmd        ="wget -O"
        g:netrw_dav_cmd         ="cadaver"
        g:netrw_rsync_cmd       ="rsync -a"
        g:netrw_fetch_cmd       =""   This variable is used for ftp and http
                                      reading only if it ends with "fetch -o"


The script will also make use of the following variables internally,
albeit temporarily.

	g:netrw_method		Index indicating rcp/ftp+.netrc/ftp
	g:netrw_machine		Holds machine name parsed from input
	g:netrw_fname		Holds filename being accessed


==============================================================================
5. User Options						*netrw-options*

    Option            Type        Setting         Meaning ~
    ---------         --------    --------------  --------------------------- >

    netrw_ftp         variable    =doesn't exist  userid set by "user userid"
                                  =0              userid set by "user userid"
                                  =1              userid set by "userid"

    NetReadFixup      function    =doesn't exist  no change
                                  =exists         Allows user to have files
                                                  read via ftp automatically
                                                  transformed however they wish
                                                  by NetReadFixup()
    g:netrw_rcp_cmd    variable   ="rcp"
    g:netrw_ftp_cmd    variable   ="ftp"
    g:netrw_scp_cmd    variable   ="scp -q"
    g:netrw_http_cmd   variable   ="wget -O"
    g:netrw_dav_cmd    variable   ="cadaver"
    g:netrw_rsync_cmd  variable   ="rsync -a"
    g:netrw_fetch_cmd  variable   ="" This variable is used for ftp and http
                                      reading only if it ends with "fetch -o"
<
The first two options both help with certain ftp's that give trouble
otherwise.  In order to best understand how to use these options if ftp is
giving you troubles, a bit of discussion follows on how netrw does ftp reads.

The g:netrw_..._cmd variables specify the external program to use handle the
associated protocol (rcp, ftp, etc), plus any options.

Netrw typically builds up lines of one of the following formats in a
temporary file:
>
  IF g:netrw_ftp !exists or is not 1     IF g:netrw_ftp exists and is 1
  ----------------------------------     ------------------------------
       open machine [port]                    open machine [port]
       user userid password                   userid password
       [g:netrw_ftpmode]                      password
       get filename tempfile                  [g:netrw_ftpmode]
                                              get filename tempfile
<
Netrw then executes the lines above by use of a filter:
>
	:%! {g:netrw_ftp_cmd} -i [-n]
<

where
	g:netrw_ftp_cmd is usually "ftp",
	-i tells ftp not to be interactive
	-n means don't use netrc and is used for Method #3 (ftp w/o <.netrc>)

if <.netrc> exists it will be used to avoid having to query the user for
userid and password).  The transferred file is put into a temporary file.
The temporary file is then read into the main editing session window that
requested it and the temporary file deleted.

If your ftp doesn't accept the "user" command and immediately just demands a
userid, then try putting "let netrw_ftp=1" in your <.vimrc>.

If your ftp for whatever reason generates unwanted lines (such as AUTH
messages) you may write a NetReadFixup(tmpfile) function:
>
    function! NetReadFixup(method,line1,line2)
      if     method == 1 "rcp
      elseif method == 2 "ftp + <.netrc>
      elseif method == 3 "ftp + machine,uid,password,filename
      elseif method == 4 "scp
      elseif method == 5 "http/wget
      elseif method == 6 "dav/cadaver
      elseif method == 7 "rsync
      endif
    endfunction
>
The NetReadFixup() function will be called if it exists and thus allows you
to customize your reading process.  As a further example, <netrw.vim> contains
just such a function to handle Windows 95 ftp.  For whatever reason, Windows
95's ftp dumps four blank lines at the end of a transfer, and so it is
desirable to automate their removal.  Here's some code taken from <netrw.vim>
itself:
>
    if has("win95") && g:netrw_win95ftp
     fu! NetReadFixup(method, line1, line2)
       if method == 3   " ftp (no <.netrc>)
        let fourblanklines= line2 - 3
        silent fourblanklines.",".line2."g/^\s*/d"
       endif
     endfunction
    endif
>

==============================================================================
6. Debugging						*netrw-debug*

The <netrw.vim> script is typically available as:

	/usr/local/share/vim/vim6x/plugin/netrw.vim

which is loaded automatically at startup (assuming :set nocp).

	1. Get the <Decho.vim> script, available as:

		http://vim.sourceforge.net/scripts/script.php?script_id=120

	   and put that into your local plugin directory

	2. Edit the <netrw.vim> file as follows:

		:g/DBG/s/^"//

	   (to restore to normal, use  :g/DBG/s/^/"/ )

	3. Then bring up vim and attempt a transfer.  A set of messages
	   should appear concerning the steps that <netrw.vim> took in
	   attempting to read/write your file over the network.  Please
	   send that information to <netrw.vim>'s maintainer,

		cec@NgrOyphSon.gPsfAc.nMasa.gov - NOSPAM

==============================================================================
 vim:tw=78:ts=8:ft=help:norl:
