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\input texinfo.tex @c -*-texinfo-*-
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@c %**start of header
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@setfilename mu-guile.info
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@settitle mu-guile user manual
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@documentencoding utf-8
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@c %**end of header
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@dircategory The Algorithmic Language Scheme
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@direntry
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* mu-guile manual: (mu-guile). Guile bindings for the @t{mu} e-mail indexer/searcher.
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@end direntry
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@copying
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Copyright @copyright{} 2012 Dirk-Jan C. Binnema
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@quotation
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled ``GNU Free
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Documentation License.''
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@end quotation
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@end copying
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@node Top
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@top mu4e Manual
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Welcome to @t{mu-guile}!
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@t{mu-guile} is a binding of the @t{mu} email search engine and the @t{guile}
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programming language.
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@menu
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* Introduction::
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* Getting started::
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* Initializing mu-guile::
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* Messages::
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* Contacts::
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Appendices
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* GNU Free Documentation License:: The license of this manual.
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@end menu
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@node Introduction
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@chapter Introduction
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@t{mu4e} is an e-mail program for @emph{GNU/Emacs}; it uses the @t{mu} maildir
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search engine as its backend, making @t{mu} fully search-based.
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@t{mu} is a program for indexing / searching e-mails, as well as an
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@t{emacs}-based email-client (@t{mu4e}.
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@t{guile} is the @emph{GNU Ubiquitous Intelligent Language for Extensions} - a
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version of the @emph{Scheme} programming language and the official GNU
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extension language.
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@t{mu-guile} connects @t{mu} and @t{guile}, and allows you to easily write
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programs to do things with your e-mails.
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@node Getting started
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@chapter Getting started
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@menu
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* Installation::
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* First steps::
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@end menu
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2012-01-04 23:08:50 +01:00
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This chapter walks you through the installation and some basic steps to ensure
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things work correctly.
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@node Installation
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@section Installation
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@t{mu-guile} is part of @t{mu} - by installing the latter, the former will be
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installed as well. Note, however, that @t{mu-guile} requires you to have
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@t{guile} version 2.0 installed, otherwise @t{mu-guile} will not be
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built/installed.
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At the time of writing, there are no distribution packages for @t{mu-guile}
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yet, so we are assuming installation from source packages.
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Installation follows the normal sequence of:
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@example
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$ tar xvfz mu-<version>.tar.gz # use the specific version
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$ cd mu-<version>
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$./configure
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@end example
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The output of @t{./configure} should end with a little text describing the
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detected versions of various libraries @t{mu} depends on. In particular, it
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should mention the @t{guile} version, e.g.
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@example
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Guile version : 2.0.3.82-a2c66
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@end example
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If you don't see any line referring to @t{guile}, please install it, and run
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@t{configure} again. Note once more, @t{mu-guile} requires @t{guile} version
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2.0.
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After a succesfull @t{./configure}, we can make and install the package:
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@example
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$ make && sudo make install
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@end example
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After this, @t{mu} and @t{mu-guile} should be installed. Note that the above
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instructions will normally install things under @t{/usr/local}; you may need
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to update @t{guile}'s @t{%load-path} to find it there.
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You can check the current load-path with the following:
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@example
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guile -c '(display %load-path)(newline)'
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@end example
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If necessary, you can add the @t{%load-path} by adding something like the
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following to your @file{~/.guile}:
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@lisp
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(set! %load-path (cons "/usr/local/share/guile/site/2.0" %load-path))
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@end lisp
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After this, you should be ready to go.
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@node First steps
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@section First steps
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Assuming @t{mu-guile} has been installed correctly (@ref{Installation}), and
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also assuming that you have already indexed your e-mail messages (if
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necessary, see the @t{mu-index} man-page), we are ready to start @t{mu-guile};
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a session may look something like this:
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@verbatim
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$ guile
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GNU Guile 2.0.3.82-a2c66
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Copyright (C) 1995-2011 Free Software Foundation, Inc.
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Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
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This program is free software, and you are welcome to redistribute it
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under certain conditions; type `,show c' for details.
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Enter `,help' for help.
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scheme@(guile-user)>
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@end verbatim
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Now, we need to load the @t{mu-guile} module:
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@verbatim
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scheme@(guile-user)> (use-modules (mu) (mu message))
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@end verbatim
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This will load the basic modules for dealing with messages. After we have
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loaded the modules, we need to initialize the @t{mu-guile} system:
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@verbatim
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scheme@(guile-user)> (mu:initialize)
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@end verbatim
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When this is done, we can start querying the database. We'll go into various
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functions later in this manual, but just to give an example, let's get a list
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of the subjects of all messages that mention @emph{hello}:
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@verbatim
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scheme@(guile-user)> (for-each
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(lambda(msg)
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(format #t "Subject: ~a\n" (subject msg)))
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(mu:message-list "hello"))
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@end verbatim
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2012-01-06 15:18:18 +01:00
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@node Initializing mu-guile
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@chapter Initializing mu-guile
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It is of course possible to write separate programs with @t{mu-guile}, but for
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now we'll do things @emph{interactively}, i.e., from the Guile-prompt
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(``@abbr{REPL}'').
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We start our @t{mu-guile} session by starting @t{guile}:
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@verbatim
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$ guile
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GNU Guile 2.0.3.82-a2c66
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Copyright (C) 1995-2011 Free Software Foundation, Inc.
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Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
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This program is free software, and you are welcome to redistribute it
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under certain conditions; type `,show c' for details.
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Enter `,help' for help.
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scheme@(guile-user)>
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@end verbatim
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Now, the first thing we need to do is load the @t{mu-guile} modules;
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currently, there are three available:
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@itemize
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@item @code{mu} - initialization, functions to get messages, contacts
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@item @code{mu message} - functions to deal with messages
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@item @code{mu contact} - functions to deal with contacts
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@end itemize
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Let's simply load all of them:
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@verbatim
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scheme@(guile-user)> (use-modules (mu) (mu message) (mu contact))
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@end verbatim
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Assuming you have installed everything correctly, the first time you do this,
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@t{guile} will probably respond by showing some message about compiling the
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modules, and then end with another prompt.
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Before we can do anything with @t{mu guile}, we need to initialize the
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system. The reason as to not do this automatically is to enable people to use
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non-default places to keep there @t{mu} data files.
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We can initialize the system with:
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@verbatim
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scheme@(guile-user)> (mu:initialize)
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@end verbatim
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Which will use the default location of @file{~/.mu}. Or, instead, if you keep
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your @t{mu} data in a non-standard place:
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@verbatim
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scheme@(guile-user)> (mu:initialize #t "/path/to/my/mu/")
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@end verbatim
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2012-01-06 13:33:06 +01:00
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Note, the second parameter, @t{#t} is for future use; simply set it to @t{#t}
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for now.
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2012-01-04 23:08:50 +01:00
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If all worked up until here, we're ready to go with @t{mu-guile}.
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@node Messages
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@chapter Messages
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In this chapter, we discuss how to find messages, and then how to do various
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things with them.
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@menu
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* Finding messages::
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* Message functions::
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@end menu
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@node Finding messages
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@section Finding messages
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Now we are ready to retrieve some messages from the system. There are two
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principle functions to do this:
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@itemize
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@item @code{(mu:message-list [<search-expression>])}
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@item @code{(mu:for-each-message <function> [<search-expression>])}
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@end itemize
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The first function, @code{mu:message-list} returns a list of all messages
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matching @t{<search-expression>}; if you leave @t{<search-expression>} out, it
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returns @emph{all} messages.
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For example, to get all messages with @emph{coffee} in the subject line, you
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could do:
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@verbatim
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scheme@(guile-user)> (mu:message-list "subject:coffee")
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$1 = (#<<mu-message> 9040640> #<<mu-message> 9040630>
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#<<mu-message> 9040570>)
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@end verbatim
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So, we get a list with three @t{<mu-message>} objects. We'll discuss them in a
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bit more detail in the next section, but let's just use the @code{subject}
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function ('method') provided by @t{<mu-message>} objects to retrieve the
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subject-field.
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For your convenience, @t{guile} has saved the result in @t{$1}, so to get the
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subject of the first message in the list, we can do:
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@verbatim
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scheme@(guile-user)> (subject (car $1))
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$2 = "Re: best coffee ever!"
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@end verbatim
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The second function we mentioned, @code{mu:for-each-message}, executes some
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function for each message matched by the search expression (or @emph{all}
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message if the search expression is omitted).
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@verbatim
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scheme@(guile-user)> (mu:for-each-message
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(lambda(msg)
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(display (subject msg))
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(newline))
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"subject:coffee")
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Re: best coffee ever!
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best coffee ever!
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Coffee beans
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scheme@(guile-user)>
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@end verbatim
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Using @code{mu:message-list} and/or
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@code{mu:for-each-message}@footnote{Implementation node:
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@code{mu:message-list} is implemented in terms of @code{mu:for-each-message},
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not the other way around. Due to the way @t{mu} works,
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@code{mu:for-each-message} is rather more efficient than a combination for
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@code{for-each} and @code{mu:message-list}} and a couple of @t{<mu-message>}
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methods, together with that Guile/Scheme provides should allow for many
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interesting programs.
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@node Message functions
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@section Message functions
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Now that we've seen how to retrieve lists of message objects
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(@code{<mu-message>}), let's see what we can do with such an object.
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@code{<mu-message>} defines the following methods
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@footnote{A note on naming: functions we have seen before --
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@code{mu:initialize}, @code{mu:message-list} and @code{mu:for-each-message}
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are prefixed with @t{mu:}. This is not the case for the @code{<mu-message>}
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methods to be discussed next, such as the methods @code{subject} and
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@code{from}. Reason for this is that it is not @emph{needed}, since these
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methods only recognized for @code{<mu-message>} objects, and do not affect
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anything else, while the @code{mu:}-prefixed are 'globally visible' and thus
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we need to be careful about naming conflicts}
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that all only take a single
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@code{<mu-message>} object as a parameter. We won't go into the exact meanings
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for all of these functions here - for the details about various flags /
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properties, please refer to the @t{mu-find} man-page.
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@itemize
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@item @code{bcc}: the @t{Bcc} field of the message, or @t{#f} if there is none
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@item @code{body-html}: : the html body of the message, or @t{#f} if there is none
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@item @code{body-txt}: the plain-text body of the message, or @t{#f} if there is none
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@item @code{cc}: the @t{Bcc} field of the message, or @t{#f} if there is none
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@item @code{date}: the @t{Date} field of the message, or 0 if there is none
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@item @code{flags}: list of message-flags for this message
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@item @code{from}: the @t{From} field of the message, or @t{#f} if there is none
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@item @code{maildir}: the maildir this message lives in, or @t{#f} if there is none
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2012-01-04 23:08:50 +01:00
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@item @code{message-id}: the @t{Message-Id} field of the message, or @t{#f} if there is none
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2012-01-06 13:33:06 +01:00
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@item @code{path}: the file system path for this message
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2012-01-04 23:08:50 +01:00
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@item @code{priority}: the priority of this message (either @t{mu:low}, @t{mu:normal}
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or @t{mu:high}
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@item @code{references}: the list of messages (message-ids) this message
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refers to in the @t{References:} header
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2012-01-06 13:33:06 +01:00
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@item @code{size}: size of the message in bytes
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@item @code{subject}: the @t{Subject} field of the message, or @t{#f} if there is none.
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@item @code{tags}: list of tags for this message
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@item @code{to}: the sender of the message, or @t{#f} if there is none.
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2012-01-04 23:08:50 +01:00
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@end itemize
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With these functions, we can query messages for their properties; for example:
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@verbatim
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scheme@(guile-user)> (define msg (car (mu:message-list "snow")))
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scheme@(guile-user)> (subject msg)
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$1 = "Re: Running in the snow is beautiful"
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scheme@(guile-user)> (flags msg)
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$2 = (mu:replied mu:seen)
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scheme@(guile-user)> (strftime "%F" (localtime (date msg)))
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$3 = "2011-01-15"
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@end verbatim
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There are a couple more functions:
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@itemize
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@item @code{(header <mu-message> "<header-name>")} returns an arbitrary message
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header (or @t{#f} if not found) -- e.g. @code{(header msg "User-Agent")}
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2012-01-06 13:33:06 +01:00
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@item @code{(contacts <mu-message> contact-type)} which returns a list
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2012-01-04 23:08:50 +01:00
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of contacts (names/e-mail addresses in the To/From/Cc/Bcc-fields).
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@xref{Contacts}.
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@end itemize
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2012-01-06 13:33:06 +01:00
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Now, let's write a little example -- let's find out what is the @emph{longest
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subject} of any of your e-mail messages; you can put in a separate file, make
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it executable, and run it like any program.
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@verbatim
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#!/bin/sh
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exec guile -e main -s $0 $@
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!#
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|
(use-modules (mu) (mu message))
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(let* ((longest-subj ""))
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|
(mu:initialize)
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|
(mu:for-each-message
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|
(lambda(msg)
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|
(let ((subj (subject msg)))
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|
(if (and subj (> (string-length subj) (string-length longest-subj)))
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|
(set! longest-subj subj))))
|
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query)
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(format #t "Longest subject: ~a" longest-subj))
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|
@end verbatim
|
2012-01-04 23:08:50 +01:00
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@node Contacts
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@chapter Contacts
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|
2012-01-01 21:45:47 +01:00
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@node GNU Free Documentation License
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|
@appendix GNU Free Documentation License
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@include fdl.texi
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@bye
|