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authorMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-02 15:02:49 +0100
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-02 15:02:49 +0100
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--- $XFree86: xc/programs/xterm/README.i18n,v 1.1 2003/11/13 01:16:37 dickey Exp $
-
-Using xterm in your language
-============================
-
-Since XFree86 version 4.0, the internationalization (i18n) feature of
-xterm is gradually improved. Xterm is being improved even now. You
-need only set the standard locale environment variables such as
-LC_CTYPE, LC_ALL, LC_CTYPE, or LANG. Once the locale is set up you can
-use xterm in your favorite character encoding.
-
-This document explains how the i18n feature is realized and how to
-configure xterm for your character encoding.
-
-Refer to locale(7) for details of the locale mechanism.
-
-
-Basic i18n-related settings and resources
-=========================================
-
-These settings apply to XFree86 xterm patch #181, and the program luit
-which is distributed with XFree86 4.4
-
-1. Usage of "locale mode"
-
- On startup, xterm must be in "locale mode" to make it follow the
- current locale. You can invoke xterm in locale mode in these ways:
-
- a. Set "vt100.locale" resource "true". This resource was
- introduced since XFree86 4.3. The default value of the "locale"
- resource is "medium", which means xterm follows the locale only
- in Chinese, Japanese, Korean, or Thai locales. For example,
-
- XTerm*locale: true
-
- in your ~/.Xresources file.
-
- or
-
- b. Invoke xterm with the "-lc" option.
-
-2. Converter program "luit"
-
- The "luit" must be available in the standard XFree86 binary
- directory. It is usually available because it is part of the
- XFree86 distribution. The standard binary directory may differ from
- system to system. /usr/X11R6/bin/luit is an example.
-
- "luit" is used to convert between Unicode and the character encoding
- for your locale. When built for XFree86, xterm includes logic for
- invoking luit.
-
-3. Locale setting
-
- Finally, you will need to configure your locale. We expect that you
- have already configured your locale for other software. For example,
-
- LANG=de_DE@euro
- export LANG
-
- in your ~/.xsession file. There are many ways to configure locale.
- For example, your display manager may have a mechanism to invoke a
- window manager in your favorite locale, or you may have system-wide
- locale setting in /etc/environment. You may also have set the
- LC_ALL variable instead of the LANG variable.
-
-
-How to use xterm in different locale temporarily
-================================================
-
-You may sometimes need to invoke xterm in a different character encoding
-than your current locale. For example, use xterm to login remote systems
-in different locale.
-
-Do this by invoking xterm in the target locale. For example,
-
- $ LANG=ru_RU.KOI8-R xterm &
-
-Previously, font setting has been used in such cases.
-
- $ xterm -fn -misc-fixed-medium-r-normal--10-*-*-*-*-*-koi8-r &
-
-This does not work well in conjunction with the "locale" resource,
-because luit and xterm combined rely upon Unicode fonts.
-
-
-How to set fonts for UTF-8/locale modes
-=======================================
-
-Since xterm patch #181, xterm can automatically use Unicode fonts in
-UTF-8 mode and locale mode. Few of you will need to modify the default
-setting to display your language. In particular, Unicode fonts in
-combination with locale mode will satisfy the needs of not only
-ISO-8859-1 users but also East Asian and other non-ISO-8859-1 users.
-
-If you want to set your favorite Unicode font for UTF-8 and locale
-modes, you should add a line such as the following in your ~/.Xresources
-file:
-
- XTerm*VT100.utf8Fonts.font: \
- -misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1
-
-The leading "XTerm*" pattern is more specific than the system's
-app-defaults file, therefore it overrides the corresponding line
-beginning with
-
- *VT100.utf8Fonts.font:
-
-Here is an additional note. If you want to display East Asian
-doublewidth characters (CJK Ideogram, Hiragana, Katakana, Hangul,
-and so on), we recommend using
-
- -misc-fixed-medium-r-semicondensed--13-*-*-*-*-*-iso10646-1
-
-or
-
- -misc-fixed-medium-r-normal--18-*-*-*-*-*-iso10646-1
-
-because these two fonts have corresponding doublewidth fonts. These
-fonts are used as default font and default "Large" font, respectively.
-
-
-The internals of xterm i18n
-===========================
-
-You do not need to read this section if you only want to configure your
-xterm. Here we describe how xterm is implemented to support i18n.
-
-The original version of xterm does not support locale or character
-encoding. Its I/O stream is interpreted as a mere 8-bit index for a
-font.
-
-Beginning with XFree86 4.0, xterm supported UTF-8. It was implemented
-as a separate UTF-8 mode from the conventional 8-bit mode. Character
-encodings had no effect on the 8-bit mode. The UTF-8 mode has been
-extended to support doublewidth characters (for East Asian characters)
-and combining characters (such as accents for Latin alphabets and Thai
-vowels/tone marks).
-
-Doublewidth characters are characters that occupy two continuing
-columns on the terminal. Xterm uses separate fonts for normal
-(singlewidth) characters and doublewidth characters. Though xterm has
-configuration items for specifying doublewidth fonts, it will
-automatically search for a font with exactly twice as wide and the same
-name as the specified normal font.
-
-The default behavior of xterm was modified to use this UTF-8 mode in
-UTF-8 locales. A command line option of "-u8" and a resource of "utf8"
-were introduced to choose UTF-8 mode.
-
-"luit" was introduced to XFree86 at version 4.2. It converts between
-UTF-8 and other encodings. When luit is invoked in a UTF-8 terminal,
-the terminal acts as if it is really running in the other encoding.
-
-Since XFree86 version 4.3, xterm provides a new mode to invoke luit
-automatically to support various encodings. The mode where xterm
-invokes luit is called "locale mode". It is the third mode following
-conventional 8-bit mode and UTF-8 mode. In the locale mode, xterm is
-aware of the current locale and character encoding. Since locale mode
-uses luit, it is based on the UTF-8 mode. That is, xterm works in UTF-8
-mode and luit works as a converter between UTF-8 and the character
-encoding for your locale. This is why the locale mode always needs
-Unicode fonts. The default behavior of xterm is modified so that the
-"locale mode" will be adopted in Chinese (Big5 and GB2312), Japanese
-(EUC-JP), Korean (EUC-KR), and Thai (ISO-8859-11, as known as TIS-620)
-locales. Locale mode is chosen for these character encodings because
-these encodings are not supported by conventional 8-bit mode even by
-changing fonts (ISO-8859-11 needs combining characters and others need
-doublewidth characters).
-
-To control the locale mode, command line options of "-lc" and "-en" and
-a resource of "locale" were introduced. The command line option of
-"-u8" and a resource of "utf8" were made obsolete by them, though
-retained for compatibility.
-
-Since XFree86 version 4.4, xterm can have two sets of default fonts,
-one for conventional 8-bit mode and another for UTF-8 and locale modes,
-by introducing the "utf8Fonts" subresource.
-
-
-Future TODO Items
-=================
-
-We anticipate that xterm's locale mode will be used increasingly in the
-future. Since the UTF-8 and locale modes use more resources than
-conventional 8-bit mode (because it needs larger fonts and another
-process "luit"), faster hardware may be needed to gain complete
-acceptance by users. However, the locale mechanism allows users
-to manipulate data in a standard form. Its usefulness compensates
-in part for reduced performance.
-
-Xterm supports antialiased fonts ("-fa" and "-fs" command line options).
-Currently UTF-8 nor locale modes do not work with antialiased fonts.
-
-Xterm does not support bi-directional or RTL languages such as Hebrew
-and Arab. A simple standard how terminal should behave for these
-languages is needed.
-
-Xterm does not support Unicode characters above U+10000.