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authorPeter Stephenson <[email protected]>2008-04-14 12:53:35 +0000
committerPeter Stephenson <[email protected]>2008-04-14 12:53:35 +0000
commitb1b941c30b6f35697c48555448337fa151df52bf (patch)
treedf2522d0592c004793048eb7e4adce700fa32038 /Etc
parentf125ca3293802426a41715f73b35f66f7f045252 (diff)
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24811: update introductory multibyte documentation
Diffstat (limited to 'Etc')
-rw-r--r--Etc/FAQ.yo91
1 files changed, 44 insertions, 47 deletions
diff --git a/Etc/FAQ.yo b/Etc/FAQ.yo
index 97339319..703bf02d 100644
--- a/Etc/FAQ.yo
+++ b/Etc/FAQ.yo
@@ -126,11 +126,11 @@ Chapter 4: The mysteries of completion
4.5. How do I get started with programmable completion?
4.6. Suppose I want to complete all files during a special completion?
-Chapter 5: Multibyte input
+Chapter 5: Multibyte input and output
5.1. What is multibyte input?
-5.2. How does zsh handle multibyte input?
-5.3. How do I ensure multibyte input works on my system?
+5.2. How does zsh handle multibyte input and output?
+5.3. How do I ensure multibyte input and output work on my system?
5.4. How can I input characters that aren't on my keyboard?
Chapter 6: The future of zsh
@@ -1961,7 +1961,7 @@ sect(Suppose I want to complete all files during a special completion?)
such as expansion or approximate completion.
-chapter(Multibyte input)
+chapter(Multibyte input and output)
label(c5)
sect(What is multibyte input?)
@@ -2012,7 +2012,7 @@ sect(What is multibyte input?)
in those formats.)
-sect(How does zsh handle multibyte input?)
+sect(How does zsh handle multibyte input and output?)
Until version 4.3, zsh didn't handle multibyte input properly at all.
Each octet in a multibyte character would look to the shell like a
@@ -2021,50 +2021,44 @@ sect(How does zsh handle multibyte input?)
cause all sorts of odd effects. (It was possible to edit in zsh using
single-byte extensions of ASCII such as the ISO 8859 family, however.)
- From version 4.3, multibyte input is handled in the line editor if zsh
- has been compiled with the appropriate definitions. This will happen
- automatically if the compiler defines __STDC_ISO_10646__, which is true
- for many recent GNU-based systems. On other systems you must configure
- zsh with the argument --enable-multibyte to configure. Explicit use of
- --enable-multibyte should work on many other recent UNIX systems; if it
- works on yours, and that's not mentioned in the shell documentation,
- please report this to [email protected], and if it doesn't but you
- can work out why not we'd also be interested in hearing.
-
- (The reason for the test for __STDC_ISO_10646__ is that its presence
- happens to indicate that the required library support is likely to be
- present, short-circuiting a large number of configuration tests. This
- isn't strictly guaranteed, since the definition indicates the rather more
- limited fact that the wide character representation used internally by
- the shell is Unicode. However, in practice such systems provide the
- right level of support for zsh to use. It would be better to test
- individually for the library features the shell needs; unfortunately
- there are a lot of them.)
-
- You can test if multibyte handling is compiled into your version of the
- shell by running:
- verb(
- (bindkey -m)
- )
- which should output a warning:
- verb(
- bindkey: warning: `bindkey -m' disables multibyte support
- )
- If it doesn't, you don't have multibyte support in your shell. The
- parentheses are there to run the command in a subshell, which protects
- your interactive shell from the effects being warned about.
-
- Multibyte strings are not yet handled anywhere else in the shell. This
- means, for example, patterns treat multibyte characters as a set of single
- octets and the ${#var} syntax counts octets, not characters. There will
- probably be new syntax to ensure that zsh can work both in its traditional
- way as well as when interpreting multibyte characters.
-
-
-sect(How do I ensure multibyte input works on my system?)
+ From version 4.3.4, multibyte input is handled in the line editor if zsh
+ has been compiled with the appropriate definitions, and is automatically
+ activated. This is indicated by the option tt(MULTIBYTE), which is
+ set by default on shells that support multibyte mode. Hence you
+ can test this with a standard option test: `tt([[ -o multibyte ]])'.
+
+ The tt(MULTIBYTE) option affects the entire shell: parameter expansion,
+ pattern matching, etc. count valid multibyte character strings as a
+ single character. You can unset the option locally in a function to
+ revert to single-byte operation.
+
+ Note that if the shell is emulating a Bourne shell the tt(MULTIBYTE)
+ option is unset by default. This allows various POSIX modes to
+ work normally (POSIX does not deal with multibyte characters). If
+ you use a "sh" or "ksh" emulation interactively you shouldprobably
+ set the tt(MULTIBYTE) option.
+
+ The other option that affects multibyte support is tt(COMBINING_CHARS),
+ new in version 4.3.7. When this is set, any zero-length punctuation
+ characters that follow an alphanumeric character (the base character) are
+ assumed to be modifications (accents etc.) to the base character and to
+ be displayed within the same screen area as the base character. As not
+ all terminals handle this, even if they correctly display the base
+ multibyte character, this option is not on by default. The KDE terminal
+ emulator tt(konsole) is known to handle combining characters.
+
+ The tt(COMBINING_CHARS) option only affects output; combining characters
+ may always be input, but when the option is off will be displayed
+ specially. By default this is as a code point (the index of the
+ character in the character set) between angle brackets, usually
+ in inverse video. Highlighting of such special characters can
+ be modified using the new array parameter tt(zle_highlight).
+
+
+sect(How do I ensure multibyte input and output work on my system?)
Once you have a version of zsh with multibyte support, you need to
- ensure the envivronment is correct. We'll assume you're using UTF-8.
+ ensure the environment is correct. We'll assume you're using UTF-8.
Many modern systems may come set up correctly already. Try one of
the editing widgets described in the next section to see.
@@ -2163,6 +2157,9 @@ url(http://www.unicode.org/charts/)(http://www.unicode.org/charts/).
however, using UTF-8 massively extends the number of valid characters
that can be produced.
+ See also url(http://www.cl.cam.ac.uk/~mgk25/unicode.html#input)http://www.cl.cam.ac.uk/~mgk25/unicode.html#input)
+ for general information on entering Unicode characters from a keyboard.
+
chapter(The future of zsh)