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Move documentation into README and doc/

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* Moves general documentation, such as the description and installation
  instructions, to a new README file at the root of the repo.
* Moves detailed documentation, such at command descriptions, into a text file
  under doc/ that can be indexed and searched through using Vim's `:help` command.
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2014-01-25 15:21:15 +01:00
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# vim-gnupg
This script implements transparent editing of gpg encrypted files. The filename
must have a `.gpg`, `.pgp` or `.asc` suffix. When opening such a file the
content is decrypted, when opening a new file the script will ask for the
recipients of the encrypted file. The file content will be encrypted to all
recipients before it is written. The script turns off viminfo, swapfile, and
undofile to increase security.
## Installation
Copy the `gnupg.vim` file to the `$HOME/.vim/plugin` directory. Refer to `:help
add-plugin`, `:help add-global-plugin` and `:help runtimepath` for more details
about Vim plugins.
From `man 1 gpg-agent`:
> You should always add the following lines to your `.bashrc` or whatever
> initialization file is used for all shell invocations:
>
> GPG_TTY=`tty`
> export GPG_TTY
>
> It is important that this environment variable always reflects the output of
> the tty command. For W32 systems this option is not required.
Most distributions provide software to ease handling of gpg and gpg-agent.
Examples are keychain or seahorse.
If there are specific actions that should take place when editing a
GnuPG-managed buffer, an autocmd for the User event and GnuPG pattern can be
defined. For example, the following will set `textwidth` to 72 for all
GnuPG-encrypted buffers:
autocmd User GnuPG setl textwidth=72
This will be triggered before any BufRead or BufNewFile autocmds, and therefore
will not take precedence over settings specific to any filetype that may get
set.
## Known Issues
In some cases gvim can't decrypt files.
This is caused by the fact that a running gvim has no TTY and thus gpg is not
able to ask for the passphrase by itself. This is a problem for Windows and
Linux versions of gvim and could not be solved unless a "terminal emulation" is
implemented for gvim. To circumvent this you have to use any combination of
gpg-agent and a graphical pinentry program:
- gpg-agent only:
you need to provide the passphrase for the needed key to gpg-agent
in a terminal before you open files with gvim which require this key.
- pinentry only:
you will get a popup window every time you open a file that needs to
be decrypted.
- gpgagent and pinentry:
you will get a popup window the first time you open a file that
needs to be decrypted.
## Credits
- Mathieu Clabaut for inspirations through his vimspell.vim script.
- Richard Bronosky for patch to enable `.pgp` suffix.
- Erik Remmelzwaal for patch to enable windows support and patient beta testing.
- Lars Becker for patch to make gpg2 working.
- Thomas Arendsen Hein for patch to convert encoding of gpg output.
- Karl-Heinz Ruskowski for patch to fix unknown recipients and trust model and
patient beta testing.
- Giel van Schijndel for patch to get `GPG_TTY` dynamically.
- Sebastian Luettich for patch to fix issue with symmetric encryption an set
recipients.
- Tim Swast for patch to generate signed files.
- James Vega for patches for better `*.asc` handling, better filename escaping
and better handling of multiple keyrings.
## License
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version. See http://www.gnu.org/copyleft/gpl-2.0.txt

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*gnupg.txt* Vim plugin for transparent editing of gpg encrypted files.
Maintainer: James McCoy <vega.james@gmail.com>
Original Author: Markus Braun <markus.braun@krawel.de>
License: GPLv2+
INTRODUCTION *gnupg*
This script implements transparent editing of gpg encrypted files. The
filename must have a .gpg, .pgp or .asc suffix. When opening such a file the
content is decrypted, when opening a new file the script will ask for the
recipients of the encrypted file. The file content will be encrypted to all
recipients before it is written. The script turns off viminfo, swapfile, and
undofile to increase security.
COMMANDS *gnupg-commands*
*gnupg-:GPGEditRecipients*
:GPGEditRecipients Opens a scratch buffer to change the list of
recipients. Recipients that are unknown (not in your
public key) are highlighted and have a prepended "!".
Closing the buffer makes the changes permanent.
*gnupg-:GPGViewRecipients*
:GPGViewRecipients Prints the list of recipients.
*gnupg-:GPGEditOptions*
:GPGEditOptions Opens a scratch buffer to change the options for
encryption (symmetric, asymmetric, signing). Closing
the buffer makes the changes permanent. WARNING: There
is no check of the entered options, so you need to
know what you are doing.
*gnupg-:GPGViewOptions*
:GPGViewOptions Prints the list of options.
VARIABLES *gnupg-variables*
*gnupg-g:GPGExecutable*
g:GPGExecutable If set used as gpg executable, otherwise the system
chooses what is run when "gpg" is called. Defaults to
"gpg".
*gnupg-g:GPGUseAgent*
g:GPGUseAgent If set to 0 a possible available gpg-agent won't be
used. Defaults to 1.
*gnupg-g:GPGPreferSymmetric*
g:GPGPreferSymmetric If set to 1 symmetric encryption is preferred for new
files. Defaults to 0.
*gnupg-g:GPGPreferArmor*
g:GPGPreferArmor If set to 1 armored data is preferred for new files.
Defaults to 0 unless a "*.asc" file is being edited.
*gnupg-g:GPGPreferSign*
g:GPGPreferSign If set to 1 signed data is preferred for new files.
Defaults to 0.
*gnupg-g:GPGDefaultRecipients*
g:GPGDefaultRecipients If set, these recipients are used as defaults when no
other recipient is defined. This variable is a Vim
list. Default is unset.
*gnupg-g:GPGUsePipes*
g:GPGUsePipes If set to 1, use pipes instead of temporary files when
interacting with gnupg. When set to 1, this can cause
terminal-based gpg agents to not display correctly
when prompting for passwords. Defaults to 0.
*gnupg-g:GPGHomedir*
g:GPGHomedir If set, specifies the directory that will be used for
GPG's homedir. This corresponds to gpg's --homedir
option. This variable is a Vim string.
*gnupg-g:GPGFilePattern*
g:GPGFilePattern If set, overrides the default set of file patterns
that determine whether this plugin will be activated.
Defaults to '*.\(gpg\|asc\|pgp\)'.
vim:tw=78:et:ft=help:norl:

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" Name: gnupg.vim " gnupg.vim - Vim plugin for transparent editing of gpg encrypted files.
" Last Change: 2013 Sep 09 " Maintainer: James McCoy <vega.james@gmail.com>
" Maintainer: James McCoy <vega.james@gmail.com> " Original Author: Markus Braun <markus.braun@krawel.de>
" Original Author: Markus Braun <markus.braun@krawel.de>
" Summary: Vim plugin for transparent editing of gpg encrypted files.
" License: This program is free software; you can redistribute it and/or
" modify it under the terms of the GNU General Public License
" as published by the Free Software Foundation; either version
" 2 of the License, or (at your option) any later version.
" See http://www.gnu.org/copyleft/gpl-2.0.txt
"
" Section: Documentation {{{1
"
" Description: {{{2
"
" This script implements transparent editing of gpg encrypted files. The
" filename must have a ".gpg", ".pgp" or ".asc" suffix. When opening such
" a file the content is decrypted, when opening a new file the script will
" ask for the recipients of the encrypted file. The file content will be
" encrypted to all recipients before it is written. The script turns off
" viminfo, swapfile, and undofile to increase security.
"
" Installation: {{{2
"
" Copy the gnupg.vim file to the $HOME/.vim/plugin directory.
" Refer to ':help add-plugin', ':help add-global-plugin' and ':help
" runtimepath' for more details about Vim plugins.
"
" From "man 1 gpg-agent":
"
" ...
" You should always add the following lines to your .bashrc or whatever
" initialization file is used for all shell invocations:
"
" GPG_TTY=`tty`
" export GPG_TTY
"
" It is important that this environment variable always reflects the out‐
" put of the tty command. For W32 systems this option is not required.
" ...
"
" Most distributions provide software to ease handling of gpg and gpg-agent.
" Examples are keychain or seahorse.
"
" If there are specific actions that should take place when editing a
" GnuPG-managed buffer, an autocmd for the User event and GnuPG pattern can
" be defined. For example, the following will set 'textwidth' to 72 for all
" GnuPG-encrypted buffers:
"
" autocmd User GnuPG setl textwidth=72
"
" This will be triggered before any BufRead or BufNewFile autocmds, and
" therefore will not take precedence over settings specific to any filetype
" that may get set.
"
" Commands: {{{2
"
" :GPGEditRecipients
" Opens a scratch buffer to change the list of recipients. Recipients that
" are unknown (not in your public key) are highlighted and have
" a prepended "!". Closing the buffer makes the changes permanent.
"
" :GPGViewRecipients
" Prints the list of recipients.
"
" :GPGEditOptions
" Opens a scratch buffer to change the options for encryption (symmetric,
" asymmetric, signing). Closing the buffer makes the changes permanent.
" WARNING: There is no check of the entered options, so you need to know
" what you are doing.
"
" :GPGViewOptions
" Prints the list of options.
"
" Variables: {{{2
"
" g:GPGExecutable
" If set used as gpg executable, otherwise the system chooses what is run
" when "gpg" is called. Defaults to "gpg".
"
" g:GPGUseAgent
" If set to 0 a possible available gpg-agent won't be used. Defaults to 1.
"
" g:GPGPreferSymmetric
" If set to 1 symmetric encryption is preferred for new files. Defaults to 0.
"
" g:GPGPreferArmor
" If set to 1 armored data is preferred for new files. Defaults to 0
" unless a "*.asc" file is being edited.
"
" g:GPGPreferSign
" If set to 1 signed data is preferred for new files. Defaults to 0.
"
" g:GPGDefaultRecipients
" If set, these recipients are used as defaults when no other recipient is
" defined. This variable is a Vim list. Default is unset.
"
" g:GPGUsePipes
" If set to 1, use pipes instead of temporary files when interacting with
" gnupg. When set to 1, this can cause terminal-based gpg agents to not
" display correctly when prompting for passwords. Defaults to 0.
"
" g:GPGHomedir
" If set, specifies the directory that will be used for GPG's homedir.
" This corresponds to gpg's --homedir option. This variable is a Vim
" string.
"
" g:GPGFilePattern
" If set, overrides the default set of file patterns that determine
" whether this plugin will be activated. Defaults to
" '*.\(gpg\|asc\|pgp\)'.
"
" Known Issues: {{{2
"
" In some cases gvim can't decrypt files
" This is caused by the fact that a running gvim has no TTY and thus gpg is
" not able to ask for the passphrase by itself. This is a problem for Windows
" and Linux versions of gvim and could not be solved unless a "terminal
" emulation" is implemented for gvim. To circumvent this you have to use any
" combination of gpg-agent and a graphical pinentry program:
"
" - gpg-agent only:
" you need to provide the passphrase for the needed key to gpg-agent
" in a terminal before you open files with gvim which require this key.
"
" - pinentry only:
" you will get a popup window every time you open a file that needs to
" be decrypted.
"
" - gpgagent and pinentry:
" you will get a popup window the first time you open a file that
" needs to be decrypted.
"
" Credits: {{{2
"
" - Mathieu Clabaut for inspirations through his vimspell.vim script.
" - Richard Bronosky for patch to enable ".pgp" suffix.
" - Erik Remmelzwaal for patch to enable windows support and patient beta
" testing.
" - Lars Becker for patch to make gpg2 working.
" - Thomas Arendsen Hein for patch to convert encoding of gpg output.
" - Karl-Heinz Ruskowski for patch to fix unknown recipients and trust model
" and patient beta testing.
" - Giel van Schijndel for patch to get GPG_TTY dynamically.
" - Sebastian Luettich for patch to fix issue with symmetric encryption an set
" recipients.
" - Tim Swast for patch to generate signed files.
" - James Vega for patches for better '*.asc' handling, better filename
" escaping and better handling of multiple keyrings.
" "
" Section: Plugin header {{{1 " Section: Plugin header {{{1