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# history.tcl --
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#
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# Implementation of the history command.
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#
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# Copyright (c) 1997 Sun Microsystems, Inc.
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#
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# See the file "license.terms" for information on usage and redistribution of
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# this file, and for a DISCLAIMER OF ALL WARRANTIES.
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#
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# The tcl::history array holds the history list and some additional
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# bookkeeping variables.
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#
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# nextid the index used for the next history list item.
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# keep the max size of the history list
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# oldest the index of the oldest item in the history.
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namespace eval ::tcl {
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variable history
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if {![info exists history]} {
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array set history {
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nextid 0
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keep 20
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oldest -20
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}
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}
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namespace ensemble create -command ::tcl::history -map {
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add ::tcl::HistAdd
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change ::tcl::HistChange
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clear ::tcl::HistClear
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event ::tcl::HistEvent
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info ::tcl::HistInfo
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keep ::tcl::HistKeep
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nextid ::tcl::HistNextID
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redo ::tcl::HistRedo
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}
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}
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# history --
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#
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# This is the main history command. See the man page for its interface.
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# This does some argument checking and calls the helper ensemble in the
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# tcl namespace.
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proc ::history {args} {
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# If no command given, we're doing 'history info'. Can't be done with an
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# ensemble unknown handler, as those don't fire when no subcommand is
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# given at all.
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if {![llength $args]} {
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set args info
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}
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# Tricky stuff needed to make stack and errors come out right!
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tailcall apply {arglist {tailcall history {*}$arglist} ::tcl} $args
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}
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# (unnamed) --
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#
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# Callback when [::history] is destroyed. Destroys the implementation.
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#
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# Parameters:
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# oldName what the command was called.
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# newName what the command is now called (an empty string).
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# op the operation (= delete).
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#
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# Results:
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# none
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#
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# Side Effects:
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# The implementation of the [::history] command ceases to exist.
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trace add command ::history delete [list apply {{oldName newName op} {
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variable history
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unset -nocomplain history
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foreach c [info procs ::tcl::Hist*] {
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rename $c {}
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}
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rename ::tcl::history {}
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} ::tcl}]
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# tcl::HistAdd --
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#
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# Add an item to the history, and optionally eval it at the global scope
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#
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# Parameters:
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# event the command to add
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# exec (optional) a substring of "exec" causes the command to
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# be evaled.
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# Results:
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# If executing, then the results of the command are returned
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#
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# Side Effects:
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# Adds to the history list
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proc ::tcl::HistAdd {event {exec {}}} {
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variable history
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if {
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[prefix longest {exec {}} $exec] eq ""
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&& [llength [info level 0]] == 3
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} then {
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return -code error "bad argument \"$exec\": should be \"exec\""
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}
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# Do not add empty commands to the history
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if {[string trim $event] eq ""} {
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return ""
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}
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# Maintain the history
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set history([incr history(nextid)]) $event
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unset -nocomplain history([incr history(oldest)])
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# Only execute if 'exec' (or non-empty prefix of it) given
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if {$exec eq ""} {
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return ""
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}
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tailcall eval $event
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}
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# tcl::HistKeep --
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#
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# Set or query the limit on the length of the history list
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#
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# Parameters:
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# limit (optional) the length of the history list
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#
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# Results:
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# If no limit is specified, the current limit is returned
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#
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# Side Effects:
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# Updates history(keep) if a limit is specified
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proc ::tcl::HistKeep {{count {}}} {
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variable history
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if {[llength [info level 0]] == 1} {
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return $history(keep)
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}
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if {![string is integer -strict $count] || ($count < 0)} {
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return -code error "illegal keep count \"$count\""
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}
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set oldold $history(oldest)
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set history(oldest) [expr {$history(nextid) - $count}]
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for {} {$oldold <= $history(oldest)} {incr oldold} {
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unset -nocomplain history($oldold)
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}
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set history(keep) $count
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}
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# tcl::HistClear --
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#
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# Erase the history list
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#
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# Parameters:
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# none
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#
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# Results:
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# none
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#
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# Side Effects:
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# Resets the history array, except for the keep limit
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proc ::tcl::HistClear {} {
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variable history
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set keep $history(keep)
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unset history
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array set history [list \
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nextid 0 \
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keep $keep \
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oldest -$keep \
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]
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}
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# tcl::HistInfo --
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#
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# Return a pretty-printed version of the history list
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#
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# Parameters:
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# num (optional) the length of the history list to return
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#
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# Results:
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# A formatted history list
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proc ::tcl::HistInfo {{count {}}} {
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variable history
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if {[llength [info level 0]] == 1} {
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set count [expr {$history(keep) + 1}]
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} elseif {![string is integer -strict $count]} {
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return -code error "bad integer \"$count\""
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}
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set result {}
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set newline ""
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for {set i [expr {$history(nextid) - $count + 1}]} \
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{$i <= $history(nextid)} {incr i} {
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if {![info exists history($i)]} {
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continue
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}
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set cmd [string map [list \n \n\t] [string trimright $history($i) \ \n]]
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append result $newline[format "%6d %s" $i $cmd]
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set newline \n
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}
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return $result
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}
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# tcl::HistRedo --
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#
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# Fetch the previous or specified event, execute it, and then replace
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# the current history item with that event.
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#
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# Parameters:
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# event (optional) index of history item to redo. Defaults to -1,
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# which means the previous event.
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#
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# Results:
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# Those of the command being redone.
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#
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# Side Effects:
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# Replaces the current history list item with the one being redone.
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proc ::tcl::HistRedo {{event -1}} {
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variable history
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set i [HistIndex $event]
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if {$i == $history(nextid)} {
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return -code error "cannot redo the current event"
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}
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set cmd $history($i)
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HistChange $cmd 0
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tailcall eval $cmd
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}
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# tcl::HistIndex --
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#
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# Map from an event specifier to an index in the history list.
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#
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# Parameters:
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# event index of history item to redo.
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# If this is a positive number, it is used directly.
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# If it is a negative number, then it counts back to a previous
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# event, where -1 is the most recent event.
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# A string can be matched, either by being the prefix of a
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# command or by matching a command with string match.
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#
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# Results:
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# The index into history, or an error if the index didn't match.
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proc ::tcl::HistIndex {event} {
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variable history
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if {![string is integer -strict $event]} {
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for {set i [expr {$history(nextid)-1}]} {[info exists history($i)]} \
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{incr i -1} {
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if {[string match $event* $history($i)]} {
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return $i
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}
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if {[string match $event $history($i)]} {
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return $i
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}
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}
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return -code error "no event matches \"$event\""
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} elseif {$event <= 0} {
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set i [expr {$history(nextid) + $event}]
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} else {
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set i $event
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}
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if {$i <= $history(oldest)} {
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return -code error "event \"$event\" is too far in the past"
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}
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if {$i > $history(nextid)} {
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return -code error "event \"$event\" hasn't occured yet"
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}
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return $i
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}
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# tcl::HistEvent --
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#
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# Map from an event specifier to the value in the history list.
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#
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# Parameters:
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# event index of history item to redo. See index for a description of
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# possible event patterns.
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#
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# Results:
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# The value from the history list.
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proc ::tcl::HistEvent {{event -1}} {
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variable history
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set i [HistIndex $event]
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if {![info exists history($i)]} {
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return ""
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}
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return [string trimright $history($i) \ \n]
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}
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# tcl::HistChange --
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#
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# Replace a value in the history list.
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#
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# Parameters:
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# newValue The new value to put into the history list.
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# event (optional) index of history item to redo. See index for a
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# description of possible event patterns. This defaults to 0,
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# which specifies the current event.
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#
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# Side Effects:
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# Changes the history list.
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proc ::tcl::HistChange {newValue {event 0}} {
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variable history
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set i [HistIndex $event]
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set history($i) $newValue
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}
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# tcl::HistNextID --
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#
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# Returns the number of the next history event.
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#
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# Parameters:
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# None.
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#
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# Side Effects:
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# None.
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proc ::tcl::HistNextID {} {
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variable history
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return [expr {$history(nextid) + 1}]
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}
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return
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# Local Variables:
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# mode: tcl
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# fill-column: 78
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# End:
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