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|
# Create an alias for a TCP session.
#
# The syntax is similar to the `alias' builtin. Aliases with a trailing
# `=' are assigned, while those without are listed.
#
# The alias can be used to refer to the session, however any output
# from the session will be shown using information for the base
# session name. Likewise, any other reference to the session's file
# descriptor will cause the original session name rather than the alias to
# be used.
#
# It is an error to attempt to create an alias for a non-existent session.
# The alias will be removed when the session is closed.
#
# An alias can be reused without the session having to be closed.
# However, a base session name cannot be used as an alias. If this
# becomes necessary, the base session should be renamed with tcp_rename
# first.
#
# With no arguments, list aliases.
#
# With the option -d, delete the alias. No value is allowed in this case.
#
# With the option -q (quiet), just return status 1 on failure. This
# does not apply to bad syntax, which is always reported. Bad syntax
# includes deleting aliases when supplying a value.
emulate -L zsh
setopt extendedglob cbases
local opt quiet base value alias delete arg match mbegin mend fd array
integer stat index
while getopts "qd" opt; do
case $opt in
(q) quiet=1
;;
(d) delete=1
;;
(*) return 1
;;
esac
done
(( OPTIND > 1 )) && shift $(( OPTIND - 1 ))
if (( ! $# )); then
if (( ${#tcp_aliases} )); then
for fd value in ${(kv)tcp_aliases}; do
for alias in ${=value}; do
print -r - \
"${alias}: alias for session ${tcp_by_fd[$fd]:-unnamed fd $fd}"
done
done
fi
return 0
fi
for arg in $*; do
if [[ $arg = (#b)([^=]##)=(*) ]]; then
if [[ -n $delete ]]; then
print "$0: value given with deletion command." >&2
stat=1
continue
fi
alias=$match[1]
base=$match[2]
if [[ -z $base ]]; then
# hmm, this is very nearly a syntax error...
[[ -z $quiet ]] && print "$0: empty value for alias $alias" >&2
stat=1
continue
fi
if [[ ${+tcp_by_name} -eq 0 || -z ${tcp_by_name[$base]} ]]; then
[[ -z $quiet ]] && print "$0: no base session \`$base' for alias"
stat=1
continue
fi
if [[ -n ${tcp_by_name[$alias]} ]]; then
# already exists, OK if this is an alias...
fd=${tcp_by_name[$alias]}
array=(${=tcp_aliases[$fd]})
if [[ -n ${array[(r)$alias]} ]]; then
# yes, we're OK; delete the old alias.
unset "tcp_by_name[$alias]"
index=${array[(i)$alias]}
array=(${array[1,index-1]} ${array[index+1,-1]})
if [[ -z "$array" ]]; then
unset "tcp_aliases[$fd]"
else
tcp_aliases[$fd]="$array"
fi
else
# oops
if [[ -z $quiet ]]; then
print "$0: \`$alias' is already a session name." >&2
fi
stat=1
continue
fi
fi
(( ! ${+tcp_aliases} )) && typeset -gA tcp_aliases
fd=${tcp_by_name[$base]}
if [[ -n ${tcp_aliases[$fd]} ]]; then
tcp_aliases[$fd]+=" $alias"
else
tcp_aliases[$fd]=$alias
fi
tcp_by_name[$alias]=$fd
if zmodload -i zsh/parameter; then
if (( ${+functions[tcp_on_alias]} )); then
tcp_on_alias $alias $fd
fi
fi
else
alias=$arg
fd=${tcp_by_name[$alias]}
if [[ -z $fd ]]; then
print "$0: no such alias \`$alias'" >&2
stat=1
continue
fi
# OK if this is an alias...
array=(${=tcp_aliases[$fd]})
if [[ -n ${array[(r)$alias]} ]]; then
# yes, we're OK
if [[ -n $delete ]]; then
unset "tcp_by_name[$alias]"
index=${array[(i)$alias]}
array=(${array[1,index-1]} ${array[index+1,-1]})
if [[ -z "$array" ]]; then
unset "tcp_aliases[$fd]"
else
tcp_aliases[$fd]="$array"
fi
if zmodload -i zsh/parameter; then
if (( ${+functions[tcp_on_unalias]} )); then
tcp_on_unalias $alias $fd
fi
fi
else
print -r - \
"${alias}: alias for session ${tcp_by_fd[$fd]:-unnamed fd $fd}"
fi
else
# oops
if [[ -z $quiet ]]; then
print "$0: \`$alias' is a session name." >&2
fi
stat=1
continue
fi
fi
done
return $stat
|
