Agda: A dependently typed functional programming language and proof assistant

========================================================================
Agda 2
========================================================================

Table of contents:

* Installing Agda
* Configuring the Emacs mode
* Prerequisites
* Installing a suitable version of Emacs under Windows
* Installation script for (at least) Ubuntu

------------------------------------------------------------------------
Installing Agda
------------------------------------------------------------------------

There are several ways to install Agda. (Note that this README only
discusses installation of Agda, not its standard library. See the Agda
Wiki for information about the library.)

* Using a binary package, prepared for your platform.

  Recommended if such a package exists. See the Agda Wiki.

* Using stable packages available from Hackage.

  Install the prerequisites mentioned below, then run the following
  commands:

    cabal install Agda-executable
    agda-mode setup

  The second command tries to set up Emacs for use with Agda. As an
  alternative you can copy the following text to your .emacs file:

    (load-file (let ((coding-system-for-read 'utf-8))
                    (shell-command-to-string "agda-mode locate")))

* Using the source tar balls available from the Agda Wiki, or the
  development version of the code available from our darcs repository.

  1)  Install the prerequisites mentioned below.

  2a) If your system is Unix-like you can now hopefully install the
      Agda 2 library, batch-mode tool and Emacs mode by running

        make install PREFIX=<installation location>

      (the PREFIX=<...> part can be omitted if the default location is
      OK for you).

      If your system is not sufficiently Unix-like, or you want to have
      more control, follow 2b instead.

  2b) Run the following commands in the top-level directory of the
      Agda source tree:

        cabal install
        agda-mode setup
        cd src/main
        cabal clean       # To ensure recompilation when upgrading.
        cabal install

      The second command tries to set up Emacs for use with Agda. As
      an alternative you can copy the following text to your .emacs
      file:

        (load-file (let ((coding-system-for-read 'utf-8))
                        (shell-command-to-string "agda-mode locate")))

      If you want to have more control over where files are installed
      then you can give various flags to cabal install, see
      cabal install --help.

  A section below lists an installation script which should work under
  the Ubuntu distribution of GNU/Linux, assuming that your
  configuration is reasonably standard.

------------------------------------------------------------------------
Configuring the Emacs mode
------------------------------------------------------------------------

If you want to you can customise the Emacs mode. Just start Emacs and
type the following:

   M-x load-library RET agda2-mode RET
   M-x customize-group RET agda2 RET

This is useful if you want to change the Agda search path, in which
case you should change the agda2-include-dirs variable.

If you want some specific settings for the Emacs mode you can add them
to agda2-mode-hook. For instance, if you do not want to use the Agda
input method (for writing various symbols like ∀≥ℕ→π⟦⟧) you can add
the following to your .emacs:

(add-hook 'agda2-mode-hook
          '(lambda ()
             ; If you do not want to use any input method:
             (inactivate-input-method)
             ; If you want to use the X input method:
             (set-input-method "X")
             ))

Note that, on some systems, the Emacs mode changes the default font of
the current frame in order to enable many Unicode symbols to be
displayed. This only works if the right fonts are available, though.
If you want to turn off this feature, then you should customise the
agda2-fontset-name variable.

------------------------------------------------------------------------
Prerequisites
------------------------------------------------------------------------

You need recent versions of the following programs/libraries:

   GHC:           http://www.haskell.org/ghc/
   cabal-install: http://www.haskell.org/cabal/
   Alex:          http://www.haskell.org/alex/
   Happy:         http://www.haskell.org/happy/
   GNU Emacs:     http://www.gnu.org/software/emacs/
   haskell-mode:  http://haskell.org/haskell-mode/

You should also make sure that programs installed by cabal-install are
on your shell's search path.

For instructions on installing a suitable version of Emacs under
Windows, see below.

Non-Windows users need to ensure that the development files for the C
library zlib are installed (see http://zlib.net). Your package manager
may be able to install these files for you. For instance, on Debian or
Ubuntu it should suffice to run

  apt-get install zlib1g-dev

as root to get the correct files installed.

------------------------------------------------------------------------
Installing a suitable version of Emacs under Windows
------------------------------------------------------------------------

Note that Agda code often uses mathematical and other symbols
available from the Unicode character set. In order to be able to
display these characters you may want to follow the procedure below
when installing Emacs under Windows.

1. Install NTEmacs 22.

   Download from
       http://ntemacs.sourceforge.net/
   the self-extracting executable
       ntemacs22-bin-20070819.exe

   When executed, it asks where to extract itself.  This can be
   anywhere you like, but here we write the top directory for ntemacs as
       c:/pkg/ntemacs
   in the following.

   What follows is tested only on this version.  Other versions may
   work but you have to figure out yourself how to use Unicode fonts
   on your version.

2. Install ucs-fonts and mule-fonts for emacs.

   Download from
       http://www.cl.cam.ac.uk/~mgk25/ucs-fonts.html
   the tar file
       http://www.cl.cam.ac.uk/~mgk25/download/ucs-fonts.tar.gz
   Let us write the top directory of extracted files as
       c:/pkg/ucs-fonts
   Next we create some derived fonts.
       cd c:/pkg/ucs-fonts/submission
       make all-bdfs
   This gives an error message about missing fonts, but ignore it.

   Download from
       http://www.meadowy.org/
   the tar file
       http://www.meadowy.org/meadow/dists/3.00/packages/mule-fonts-1.0-4-pkg.tar.bz2
   The untarred top directory is named "packages", but we are only
   interested in the subdirectory "packages/fonts".  Let us assume
   we moved this subdirectory to
       c:/pkg/mule-fonts

   Add the following to your .emacs

;;;;;;;;; start of quoted elisp code

(setq bdf-directory-list
      '(
        "c:/pkg/ucs-fonts/submission"
        "c:/pkg/mule-fonts/intlfonts"
        "c:/pkg/mule-fonts/efonts"
        "c:/pkg/mule-fonts/bitmap"
        "c:/pkg/mule-fonts/CDAC"
        "c:/pkg/mule-fonts/AkrutiFreeFonts"
        ))

(setq w32-bdf-filename-alist
      (w32-find-bdf-fonts bdf-directory-list))

(create-fontset-from-fontset-spec
    "-*-fixed-Medium-r-Normal-*-15-*-*-*-c-*-fontset-bdf,
    ascii:-Misc-Fixed-Medium-R-Normal--15-140-75-75-C-90-ISO8859-1,
    latin-iso8859-2:-*-Fixed-*-r-*-*-15-*-*-*-c-*-iso8859-2,
    latin-iso8859-3:-*-Fixed-*-r-*-*-15-*-*-*-c-*-iso8859-3,
    latin-iso8859-4:-*-Fixed-*-r-*-*-15-*-*-*-c-*-iso8859-4,
    cyrillic-iso8859-5:-*-Fixed-*-r-*-*-15-*-*-*-c-*-iso8859-5,
    greek-iso8859-7:-*-Fixed-*-r-*-*-15-*-*-*-c-*-iso8859-7,
    latin-iso8859-9:-*-Fixed-*-r-*-*-15-*-*-*-c-*-iso8859-9,
    mule-unicode-0100-24ff:-Misc-Fixed-Medium-R-Normal--15-140-75-75-C-90-ISO10646-1,
    mule-unicode-2500-33ff:-Misc-Fixed-Medium-R-Normal--15-140-75-75-C-90-ISO10646-1,
    mule-unicode-e000-ffff:-Misc-Fixed-Medium-R-Normal--15-140-75-75-C-90-ISO10646-1,
    japanese-jisx0208:-JIS-Fixed-Medium-R-Normal--16-150-75-75-C-160-JISX0208.1983-0,
    japanese-jisx0208-1978:-Misc-Fixed-Medium-R-Normal--16-150-75-75-C-160-JISC6226.1978-0,
    japanese-jisx0212:-Misc-Fixed-Medium-R-Normal--16-150-75-75-C-160-JISX0212.1990-0,
    latin-jisx0201:-*-*-medium-r-normal-*-16-*-*-*-c-*-jisx0201*-*,
    katakana-jisx0201:-Sony-Fixed-Medium-R-Normal--16-120-100-100-C-80-JISX0201.1976-0,
    thai-tis620:-Misc-Fixed-Medium-R-Normal--24-240-72-72-C-120-TIS620.2529-1,
    lao:-Misc-Fixed-Medium-R-Normal--24-240-72-72-C-120-MuleLao-1,
    tibetan:-TibMdXA-fixed-medium-r-normal--16-160-72-72-m-160-MuleTibetan-0,
    tibetan-1-column:-TibMdXA-fixed-medium-r-normal--16-160-72-72-m-80-MuleTibetan-1,
    korean-ksc5601:-Daewoo-Mincho-Medium-R-Normal--16-120-100-100-C-160-KSC5601.1987-0,
    chinese-gb2312:-ISAS-Fangsong ti-Medium-R-Normal--16-160-72-72-c-160-GB2312.1980-0,
    chinese-cns11643-1:-HKU-Fixed-Medium-R-Normal--16-160-72-72-C-160-CNS11643.1992.1-0,
    chinese-big5-1:-ETen-Fixed-Medium-R-Normal--16-150-75-75-C-160-Big5.ETen-0,
    chinese-big5-2:-ETen-Fixed-Medium-R-Normal--16-150-75-75-C-160-Big5.ETen-0
    " t)

(setq font-encoding-alist
      (append '(
                ("JISX0208" (japanese-jisx0208 . 0))
                ("JISX0212" (japanese-jisx0212 . 0))
                ("CNS11643.1992.1-0" (chinese-cns11643-1 . 0))
                ("GB2312" (chinese-gb2312 . 0))
                ("KSC5601" (korean-ksc5601 . 0))
                ("VISCII" (vietnamese-viscii-lower . 0))
                ("MuleArabic-0" (arabic-digit . 0))
                ("MuleArabic-1" (arabic-1-column . 0))
                ("MuleArabic-2" (arabic-2-column . 0))
                ("muleindian-1" (indian-1-column . 0))
                ("muleindian-2" (indian-2-column . 0))
                ("MuleTibetan-0" (tibetan . 0))
                ("MuleTibetan-1" (tibetan-1-column . 0))
                ) font-encoding-alist))

;;;;;;; end of quoted elisp code

   To test the fonts, try

       M-x eval-expression RET
       (set-default-font "fontset-bdf") RET
       M-x view-hello-file

   You should see all the characters without white-boxes.

------------------------------------------------------------------------
Installation script for (at least) Ubuntu
------------------------------------------------------------------------

Installs the development version.

  sudo apt-get install ghc6 happy alex darcs emacs haskell-mode zlib1g-dev
  wget http://www.haskell.org/cabal/release/cabal-install-0.6.0.tar.gz
  tar xzf cabal-install-0.6.0.tar.gz
  cd cabal-install-0.6.0
  . bootstrap.sh
  cd ..
  darcs get --partial http://code.haskell.org/Agda
  cd Agda
  sudo make install