# Vim documentation: os_risc

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    *os_risc.txt*   For Vim version 6.2b.  Last change: 2002 Oct 29

    		  VIM REFERENCE MANUAL    by Thomas Leonard

    						*riscos* *RISCOS* *RISC-OS*
    This file contains the particularities for the RISC OS version of Vim.

    The RISC OS port is a completely new port and is not based on the old `archi'
    port.

    1.  File locations		|riscos-locations|
    2.  Filename munging		|riscos-munging|
    3.  Command-line use		|riscos-commandline|
    4.  Desktop (GUI) use		|riscos-gui|
    5.  Remote use (telnet)		|riscos-remote|
    6.  Temporary files		|riscos-temp-files|
    7.  Interrupting		|riscos-interrupt|
    8.  Memory usage		|riscos-memory|
    9.  Filetypes			|riscos-filetypes|
    10. The shell			|riscos-shell|
    11. Porting new releases	|riscos-porting|

    If I've missed anything, email me and I'll try to fix it.  In fact, even if I
    haven't missed anything then email me anyway to give me some confidence that it
    actually works!

    Thomas Leonard <tal197@ecs.soton.ac.uk>

     Port homepage:	http://www.ecs.soton.ac.uk/~tal197/
     or try:	http://www.soton.ac.uk/~tal197/

    ==============================================================================

    							*riscos-locations*
    1. File locations

    The Vim executable and shared resource files are all stored inside the !Vim
    application directory.

    When !Vim is first seen by the filer, it aliases the *vi and *ex commands to
    run the command-line versions of Vim (see |riscos-commandline|).

    !Vim.Resources and !Vim.Resources2 contain the files from the standard Vim
    distribution, but modified slightly to work within the limits of ADFS, plus
    some extra files such as the window templates.

    User choices are read from `Choices:*' and are saved to `<Choices$Write>.*'.
    If you have the new !Boot structure then these should be set up already. If
    not, set Choices$Path to a list of directories to search when looking for
    user configuration files. Set Choices$Write to the directory you want files
    to be saved into (so your search patterns and marks can be remembered between
    sessions).

    ==============================================================================

    							*riscos-munging*
    2. Filename munging

    All pathname munging is disabled by default, so Vim should behave like a
    normal RISC OS application now. So, if you want to edit `doc/html' then you
    actually type `*vi doc/html'.

    The only times munging is done is when:

    - Searching included files from C programs, since these are always munged.
      See |[I|.
      Note: make sure you are in the right directory when you use this
    	command (ie the one with subdirectories 'c' and 'h').

    - Sourcing files using |:so|.
      Paths starting `$VIM/' are munged like this:

      $VIM/syntax/help.vim  ->  Vim:syntax.help

      Also, files ending in `.vim' have their extensions removed, and slashes
      replaced with dots.

    Some tag files and script files may have to be edited to work under this port.

    ==============================================================================

    							*riscos-commandline*
    3. Command-line use

    To use Vim from the command-line use the `*vi' command (or '*ex' for
    |Ex-mode|).

    Type `*vi -h' for a list of options.

    Running the command-line version of Vim in a large high-color mode may cause
    the scrolling to be very slow. Either change to a mode with fewer colors or
    use the GUI version.

    Also, holding down Ctrl will slow it down even more, and Ctrl-Shift will
    freeze it, as usual for text programs.

    ==============================================================================

    							*riscos-gui*
    4. Desktop use

    Limitations:

    - Left scrollbars don't work properly (right and bottom are fine).
    - Doesn't increase scroll speed if it gets behind.

    You can resize the window by dragging the lower-right corner, even though
    there is no icon shown there.

    You can use the --rows and --columns arguments to specify the initial size of
    the Vim window, like this:

      *Vi -g --rows 20 --columns 80

    The global clipboard is supported, so you can select some text and then
    paste it directly into another application (provided it supports the
    clipboard too).

    Clicking Menu now opens a menu like a normal RISC OS program. Hold down Shift
    when clicking Menu to paste (from the global clipboard).

    Dragging a file to the window replaces the CURRENT buffer (the one with the
    cursor, NOT the one you dragged to) with the file.

    Dragging with Ctrl held down causes a new Vim window to be opened for the
    file (see |:sp|).

    Dragging a file in with Shift held down in insert mode inserts the pathname of
    the file.

    :browse :w opens a standard RISC OS save box.
    :browse :e opens a directory viewer.

    For fonts, you have the choice of the system font, an outline font, the system
    font via ZapRedraw and any of the Zap fonts via ZapRedraw:

      :set guifont=
     			To use the system font via the VDU drivers. Supports
    			bold and underline.

      :set guifont=Corpus.Medium
     			Use the named outline font. You can use any font, but
    			only monospaced ones like Corpus look right.

      :set guifont=Corpus.Medium:w8:h12:b:i
     			As before, but with size of 8 point by 12 point, and
    			in bold italic.
    			If only one of width and height is given then that
    			value is used for both. If neither is given then 10
    			point is used.

    Thanks to John Kortink, Vim can use the ZapRedraw module. Start the font name
    with '!' (or '!!' for double height), like this:

      :set guifont=!!
     			Use the system font, but via ZapRedraw.  This gives a
    			faster redraw on StrongARM processors, but you can't
    			get bold or italic text. Double height.

      :set guifont=!script
     			Uses the named Zap font (a directory in VimFont$Path).
    			The redraw is the same speed as for '!!', but you get
    			a nicer looking font.
    			Only the "man+" and "script" fonts are supplied
    			currently, but you can use any of the Zap fonts if
    			they are in VimFont$Path.
    			Vim will try to load font files '0', 'B', 'I' and 'IB'
    			from the named directory. Only '0' (normal style) MUST
    			be present. Link files are not currently supported.

    Note that when using ZapRedraw the edit bar is drawn in front of the character
    you are on rather than behind it. Also redraw is incorrect for screen modes
    with eigen values of 0. If the font includes control characters then you can
    get Vim to display them by changing the 'isprint' option.

    If you find the scrolling is too slow on your machine, try experimenting
    with the 'scrolljump' and 'ttyscroll' options.

    In particular, StrongARM users may find that:

      :set ttyscroll=0

    makes scrolling faster in high-color modes.

    =============================================================================

    							*riscos-remote*
    5. Remote use (telnet)

    I have included a built-in termcap entry, but you can edit the termcap file to
    allow other codes to be used if you want to use Vim from a remote terminal.

    Although I do not have an internet connection to my Acorn, I have managed to
    run Vim in a FreeTerm window using the loopback connection.

    It seems to work pretty well now, using '*vi -T ansi'.

    ==============================================================================

    							*riscos-temp-files*
    6. Temporary files

    If Vim crashes then the swap and backup files (if any) will be in the
    directories set with the 'directory' and 'bdir' options.  By default the swap
    files are in <Wimp$ScrapDir> (ie inside !Scrap) and backups are in the
    directory you were saving to. Vim will allow you to try and recover the file
    when you next try to edit it.

    To see a list of swap files, press <F12> and type `*vi -r'.

    Vim no longer brings up ATTENTION warnings if you try to edit two files with
    the same name in different directories.

    However, it also no longer warns if you try to edit the same file twice (with
    two copies of Vim), though you will still be warned when you save that the
    datestamp has changed.

    ==============================================================================

    							*riscos-interrupt*
    7. Interrupting

    To break out of a looping macro, or similar, hold down Escape in the
    command-line version, or press CTRL-C in the GUI version.

    ==============================================================================

    							*riscos-memory*
    8. Memory usage

    Vim will use dynamic areas on RISC OS 3.5 or later. If you can use them on
    older machines then edit the !RunTxt and GVim files. I don't know what UnixLib
    does by default on these machines so I'm playing safe.

    It doesn't work at all well without dynamic areas, since it can't change its
    memory allocation once running. Hence you should edit `!Vim.GVim' and
    `!Vim.!RunTxt' to choose the best size for you. You probably need at least
    about 1400K.

    ==============================================================================

    							*riscos-filetypes*
    9. Filetypes

    You can now specify that autocommands are only executed for files of certain
    types. The filetype is given in the form &xxx, when xxx is the filetype.

    Filetypes must be specified by number (eg &fff for Text).

    The system has changed from version 5.3. The new sequence of events is:

    - A file is loaded. |'osfiletype'| is set to the RISC OS filetype.
    - Based on the filetype and pathname, Vim will try to set |'filetype'| to the
      Vim-type of the file.
    - Setting this option may load syntax files and perform other actions.
    - Saving the file will give it a filetype of |'osfiletype'|.

    Some examples may make this clearer:

      Kind of file loaded	osfiletype	filetype
      C code 'c.hellow'	Text (&fff)	C
      LaTeX document	LaTeX (&2a8)	TeX
      Draw document		DrawFile (&aff)	(not changed)

    ==============================================================================

    							*riscos-shell*
    10. The shell

    - Bangs (!s) are only replaced if they are followed by a space or end-of-line,
      since many pathnames contain them.

    - You can prefix the command with '~', which stops any output from being
      displayed. This also means that you don't have to press <Enter> afterwards,
      and stops the screen from being redrawn. {only in the GUI version}

    ==============================================================================

    							*riscos-porting*
    11. Porting new releases to RISC OS

    Downloading everything you need:

    - Get the latest source distribution (see www.vim.org)
    - Get the runtime environment files (eg these help files)
    - Get the `extra' archive (contains the RISC OS specific bits)
    - Get the RISC OS binary distribution (if possible)

    Unarchiving:

    - Create a raFS disk and put the archives on it.
    - Un-gzip them
    - Un-tar them   (*tar xELf 50 archive/tar)

    Recompiling the sources:

    - Create c, s, and h directories.
    - Put all the header files in 'h'	     \
    - Put all the C files in `c'		     | And lose the extensions
    - Put the assembler file (`swis/s') in 's'   /
    - Rename all the files in `proto' to `h', like this:
        raFS::VimSrc.source.proto.file/pro
    	  becomes
        raFS::VimSrc.source.h.file_pro
    - In the files `h.proto' and `c.termlib', search and replace
        .pro"
           with
        _pro.h"
    - Create a simple Makefile if desired and do '*make -k'
      Use 'CC = gcc -DRISCOS -DUSE_GUI -O2 -x c' in the Makefile
    - Save the binary as !Vim.Vim in the binary distribution

    Updating the run-time environment:

    - Replace old or missing files inside !Vim.Resources with the
      new files.
    - Remove files in `doc' not ending in `/txt', except for `tags'.
    - Lose the extensions from the files in `doc'.
    - Edit the `doc.tags' file. Remove extensions from the second column:
    	:%s/^\(.[^\t]*\t.*\)\.txt\t/\1\t/
    - Remove extensions from the syntax files. Split them into two directories
      to avoid the 77 entry limit on old ADFS filesystems.
    - Edit `Vim:FileType' to match `*.c.*' as well as `*/c' and so on.
      Add filetype checking too.
    - Edit `Vim:Menu' and remove all the keys from the menus:
    	:%s/<Tab>[^ \t]*//

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