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at December 19, 2009 03:30 by syladmin
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#!/bin/bash # print the text embedded in the case that parse options from command line. # the block is matched with the marker 'CommandParse' in comment, until 'esac' extract_cmdl_options() { # use vim for parsing: # 1st grep the case block and copy in register @p + unindent in the buffer of the file itself # 2nd filter lines which start with --opt or +opt and keep comment on hte following lines until an empty line # 3rd discard changes in the buffer and quit vim -n -es -c 'g/# CommandParse/+2,/^\s\+esac/-1 d p | % d | put p | %<' \ -c 'g/^\([-+]\+[^)]\+\))/,/^\(\s\+[^- \t#]\|^$\)/-1 p' \ -c 'q!' $0 } # command line parsing {{{ arg_max=15 arg_endarg=0 # -------------------------------------------------- while [ $arg_endarg -eq 0 -a $# -gt 0 -a $arg_max -gt 0 ] do arg_max=$(($arg_max - 1)) # loop on each argument, if it's in the case modify the associated var # else end argument parsing and continue to the main routine # CommandeParse: case "$1" in --help) # This help message # print script header + the option desc # http://www.commandlinefu.com/commands/view/3344/display-an-embeded-help-message-from-bash-script-header sed -n -e '/^# Usage:/,/^$/ s/^# \?//p' < $0 extract_cmdl_options exit ;; --some_option) echo "do something undocumented" ;; --etc) # nothing done ;; --exemple) # print more example, and exit cat /etc/motd exit ;; *) # stop parsing arg_endarg=1 ;; esac if [ $arg_endarg -eq 0 ] then shift fi done # DONE parsing argument }}}
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display embeded comments for every --opt, usefull for auto documenting your script
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Bash
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Bash