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[README.unicode]
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Konsole supports unicode, which means one can display up
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to 64K different glyphs at the same time on one screen.
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The enhancement is pretty complete and the main current
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advantage should be more a smooth operation of konsole
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within localed environments. At least the european locales
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should be enabled to use their local scripts when running
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konsole.
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To fully install it, please get a complete set of unicode
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enhanced fixed fonts from
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<http://www.cl.cam.ac.uk/~mgk25/ucs-fonts.html>.
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These fonts are expected to be distributed with the next X11
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release. Konsole distributes one of this fonts for your
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convenience. Please add the other fonts to your local
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installation to make best use of the enhancement.
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Though Asiatic supplements are also available from that
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site, it is not clear at the time of writing, whether
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the current implementation copes well with these scripts.
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Since i like to support these scripts, too, any feed back
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is appreachiated.
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Also, a new linux console font has been converted for X11.
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This font has iso10646-1 encoding and the usual vga glyphs.
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* A more precise anatomy of unicode support within konsole
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The internal character representation is uniquely 16 bit unicode.
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All in- and output connections of konsole (beside the mouse)
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are filtered through three different codecs (corresponding to
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2 different codes):
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1) Font Code - The renderer converts from unicode to the code of
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the font to the degree that code is supported within Qt.
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Non-iso10646 (unicode) codes are considered to be VT100
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enhanced, meaning that 0x00 .. 0x1f contains the VT100
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graphical characters.
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2) Client Code - This is used for bytes from and to the pty.
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Often, the clients code is identical with the locale setting.
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Thus, unicode support mainly turns out to be a potter's wheel of
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code conversions.
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Beside these conversions, up to 2^16 diffent glyphs can be
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displayed now. Though it is not possible to type each of these
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codes, one can use utf-8 encoding on the clients side.
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Please note that unicode support is still under development in
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the freeware community and is not supported by terminal aware
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applications, since ncurses does currently not provide wide
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character operations.
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Because utf-8 contains ascii-7 properly, one can work with utf-8
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enabled as long as no international characters are used. Try to
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cat 9x15.repertoire-utf8 from the test when having utf-8 encoding
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enabled.
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Utf-8 code is enabled and disabled by sending <ESC>%G or <ESC>%@.
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The utf8.sh utility in the test directory does this.
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Though utf8 properly contains ascii-7 note that the length of a
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utf8 encoded string differs from the length of the string itself.
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This confuses many length aware programs as soon as proper (non-
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ascii-7 characters) are used, this may result in deviating cursor
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positions, corruption of the utf8 encoding by newlines inserted
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in the middle of a multibyte character, etc. This cannot be
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handled within konsole, but requieres those applications to
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become utf8 extended. Examples are readline, vi.
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---
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TODO: Example of non-locale client code
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= Discontining Linux console support
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As a nice side effect, the Linux console support can be reduced
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to a konsole configuration example. See README.linux.console.
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---
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