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Full Discussion: How on earth can zsh know whether it's starting at the beginning of a line or not?
Top Forums Programming How on earth can zsh know whether it's starting at the beginning of a line or not? Post 302413650 by AdrienE on Friday 16th of April 2010 01:15:20 PM
Old 04-16-2010
Quote:
Originally Posted by pludi
Really? I thought this is what the ^[[6n escape sequence was for?
Thanks, that does the trick (in a very ugly way though). No need to be ironical about it though, it's not as if hardcoded escape sequences were that much of an obvious solution (although it is true I could have found it myself, which I did, actually, a few hours after creating this thread).
Quote:
Originally Posted by pludi
Besides:
Code:
$ which zsh
/usr/bin/zsh
$ ldd -r $( which zsh )
        linux-gate.so.1 =>  (0xffffe000)
        libcap.so.1 => /lib/libcap.so.1 (0xb7f6b000)
        libdl.so.2 => /lib/libdl.so.2 (0xb7f67000)
        libnsl.so.1 => /lib/libnsl.so.1 (0xb7f50000)
        libncurses.so.5 => /lib/libncurses.so.5 (0xb7f1b000)
        libm.so.6 => /lib/libm.so.6 (0xb7ef6000)
        libc.so.6 => /lib/libc.so.6 (0xb7dc3000)
        /lib/ld-linux.so.2 (0xb7f89000)
$ zsh --version
zsh 4.3.4 (i686-suse-linux-gnu)

I did say zsh possibly used ncurses functions ("although it is very possible that it uses some ncurses functions"). It has, in fact, a ncurses module. But that doesn't mean it uses ncurses to get the cursor position. It can't do this because ncurses knows it by clearing the screen an keeping track of it, which is incompatible with launching external programs easily.
Quote:
Originally Posted by pludi
That makes it sound like you just started programming, and are thinking that writing your own shell can't be that hard, since there are so many around.
Well I'm sorry if it sounds like that but that's just not true.

As a matter of fact, I found a better solution to this problem than ^[[6n. The end is not to find the cursor position, this is the mean. The real purpose here is to be able to stay on the current line if we're at the beginning of it or print a % and get to the next line otherwise. To achieve this I thought the cursor position was needed but it's not.
You can get the same result by always printing a %, and number_of_columns_in_the_terminal - 1 spaces, then a carriage return and the 'ce' termcap. This is in fact what my version of zsh seems to do (I tried selecting the end of the last line to check for spaces).
 

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LEARN ABOUT DEBIAN

fizsh

fizsh(1)							       fizsh								  fizsh(1)

NAME

       fizsh - friendly interactive zshell.

SYNOPSIS

       fizsh [OPTIONS]... [ARGUMENTS]...

DESCRIPTION

       Fizsh is a front end to zsh. Fizsh provides zsh with interactive syntax-highlighting and a MATLAB-like history-search. Fizsh is intended to
       look and feel similar to fish. A distinguishing feature is that fizsh can handle Bourne compatible syntax. This is because fizsh is a front
       end to zsh.  Fish uses its own syntax.

CONFIGURATION

       $HOME/.fizsh is the directory where fizsh keeps its configuration files. The file $HOME/.fizsh/.fizshrc serves as the user's local startup
       script. Local customizations, such as aliases and functions, can be added here. $HOME/.fizsh/.fizshrc allows the same syntax as
       $HOME/.zshrc under zsh. $HOME/.fizsh/.fizsh_history is default name of fizsh's history file.

       The other files in $HOME/.fizsh are installed by /usr/bin/fizsh. In order to reinstall these files use: /usr/bin/fizsh -r or /usr/bin/fizsh
       --reinstall.

       Compared to the default configuration of zsh, fizsh additionally sets the options "histignorealldups", "histignorespace",
       "histreduceblanks", "incappendhistory", "interactivecomments", "promptsubst", "correct" and "nobeep".

       For further configuration details consult zsh's man pages.

INVOCATION

       Fizsh is meant to be invoked without options and without command-line arguments.

       The only supported command-line options are "--version", "--help", "--login", "--reinstall", "-v", "-h", "-l" and "-r". "--version" or "-v"
       yields fizsh's version number. "--help" or "-h" causes fizsh to print brief usage information. "--login" or "-l" cause fizsh to be a login
       shell.  "--reinstall" or "-r" will reinstall some of fizsh's configuration files (see above).

       If invoked with other command-line options and/or arguments fizsh will silently revert to zsh.

BUGS

       There are no known bugs at the moment. Bug reports, bug fixes and other comments are welcome.

NOTES

       MATLAB is a registered trademark of The MathWorks, Inc.

AUTHOR

       Written by Guido van Steen, based on work by the "zsh-syntax-highlighting contributors" and the contributors to "zsh-history-substring-
       search".

SEE ALSO

       zsh(1) fish(1)

Version 1.0.2							    9 Aug 2011								  fizsh(1)
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