You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
335 lines
7.7 KiB
335 lines
7.7 KiB
# history.tcl --
|
|
#
|
|
# Implementation of the history command.
|
|
#
|
|
# Copyright (c) 1997 Sun Microsystems, Inc.
|
|
#
|
|
# See the file "license.terms" for information on usage and redistribution of
|
|
# this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
|
#
|
|
|
|
# The tcl::history array holds the history list and some additional
|
|
# bookkeeping variables.
|
|
#
|
|
# nextid the index used for the next history list item.
|
|
# keep the max size of the history list
|
|
# oldest the index of the oldest item in the history.
|
|
|
|
namespace eval ::tcl {
|
|
variable history
|
|
if {![info exists history]} {
|
|
array set history {
|
|
nextid 0
|
|
keep 20
|
|
oldest -20
|
|
}
|
|
}
|
|
|
|
namespace ensemble create -command ::tcl::history -map {
|
|
add ::tcl::HistAdd
|
|
change ::tcl::HistChange
|
|
clear ::tcl::HistClear
|
|
event ::tcl::HistEvent
|
|
info ::tcl::HistInfo
|
|
keep ::tcl::HistKeep
|
|
nextid ::tcl::HistNextID
|
|
redo ::tcl::HistRedo
|
|
}
|
|
}
|
|
|
|
# history --
|
|
#
|
|
# This is the main history command. See the man page for its interface.
|
|
# This does some argument checking and calls the helper ensemble in the
|
|
# tcl namespace.
|
|
|
|
proc ::history {args} {
|
|
# If no command given, we're doing 'history info'. Can't be done with an
|
|
# ensemble unknown handler, as those don't fire when no subcommand is
|
|
# given at all.
|
|
|
|
if {![llength $args]} {
|
|
set args info
|
|
}
|
|
|
|
# Tricky stuff needed to make stack and errors come out right!
|
|
tailcall apply {arglist {tailcall history {*}$arglist} ::tcl} $args
|
|
}
|
|
|
|
# (unnamed) --
|
|
#
|
|
# Callback when [::history] is destroyed. Destroys the implementation.
|
|
#
|
|
# Parameters:
|
|
# oldName what the command was called.
|
|
# newName what the command is now called (an empty string).
|
|
# op the operation (= delete).
|
|
#
|
|
# Results:
|
|
# none
|
|
#
|
|
# Side Effects:
|
|
# The implementation of the [::history] command ceases to exist.
|
|
|
|
trace add command ::history delete [list apply {{oldName newName op} {
|
|
variable history
|
|
unset -nocomplain history
|
|
foreach c [info procs ::tcl::Hist*] {
|
|
rename $c {}
|
|
}
|
|
rename ::tcl::history {}
|
|
} ::tcl}]
|
|
|
|
# tcl::HistAdd --
|
|
#
|
|
# Add an item to the history, and optionally eval it at the global scope
|
|
#
|
|
# Parameters:
|
|
# event the command to add
|
|
# exec (optional) a substring of "exec" causes the command to
|
|
# be evaled.
|
|
# Results:
|
|
# If executing, then the results of the command are returned
|
|
#
|
|
# Side Effects:
|
|
# Adds to the history list
|
|
|
|
proc ::tcl::HistAdd {event {exec {}}} {
|
|
variable history
|
|
|
|
if {
|
|
[prefix longest {exec {}} $exec] eq ""
|
|
&& [llength [info level 0]] == 3
|
|
} then {
|
|
return -code error "bad argument \"$exec\": should be \"exec\""
|
|
}
|
|
|
|
# Do not add empty commands to the history
|
|
if {[string trim $event] eq ""} {
|
|
return ""
|
|
}
|
|
|
|
# Maintain the history
|
|
set history([incr history(nextid)]) $event
|
|
unset -nocomplain history([incr history(oldest)])
|
|
|
|
# Only execute if 'exec' (or non-empty prefix of it) given
|
|
if {$exec eq ""} {
|
|
return ""
|
|
}
|
|
tailcall eval $event
|
|
}
|
|
|
|
# tcl::HistKeep --
|
|
#
|
|
# Set or query the limit on the length of the history list
|
|
#
|
|
# Parameters:
|
|
# limit (optional) the length of the history list
|
|
#
|
|
# Results:
|
|
# If no limit is specified, the current limit is returned
|
|
#
|
|
# Side Effects:
|
|
# Updates history(keep) if a limit is specified
|
|
|
|
proc ::tcl::HistKeep {{count {}}} {
|
|
variable history
|
|
if {[llength [info level 0]] == 1} {
|
|
return $history(keep)
|
|
}
|
|
if {![string is integer -strict $count] || ($count < 0)} {
|
|
return -code error "illegal keep count \"$count\""
|
|
}
|
|
set oldold $history(oldest)
|
|
set history(oldest) [expr {$history(nextid) - $count}]
|
|
for {} {$oldold <= $history(oldest)} {incr oldold} {
|
|
unset -nocomplain history($oldold)
|
|
}
|
|
set history(keep) $count
|
|
}
|
|
|
|
# tcl::HistClear --
|
|
#
|
|
# Erase the history list
|
|
#
|
|
# Parameters:
|
|
# none
|
|
#
|
|
# Results:
|
|
# none
|
|
#
|
|
# Side Effects:
|
|
# Resets the history array, except for the keep limit
|
|
|
|
proc ::tcl::HistClear {} {
|
|
variable history
|
|
set keep $history(keep)
|
|
unset history
|
|
array set history [list \
|
|
nextid 0 \
|
|
keep $keep \
|
|
oldest -$keep \
|
|
]
|
|
}
|
|
|
|
# tcl::HistInfo --
|
|
#
|
|
# Return a pretty-printed version of the history list
|
|
#
|
|
# Parameters:
|
|
# num (optional) the length of the history list to return
|
|
#
|
|
# Results:
|
|
# A formatted history list
|
|
|
|
proc ::tcl::HistInfo {{count {}}} {
|
|
variable history
|
|
if {[llength [info level 0]] == 1} {
|
|
set count [expr {$history(keep) + 1}]
|
|
} elseif {![string is integer -strict $count]} {
|
|
return -code error "bad integer \"$count\""
|
|
}
|
|
set result {}
|
|
set newline ""
|
|
for {set i [expr {$history(nextid) - $count + 1}]} \
|
|
{$i <= $history(nextid)} {incr i} {
|
|
if {![info exists history($i)]} {
|
|
continue
|
|
}
|
|
set cmd [string map [list \n \n\t] [string trimright $history($i) \ \n]]
|
|
append result $newline[format "%6d %s" $i $cmd]
|
|
set newline \n
|
|
}
|
|
return $result
|
|
}
|
|
|
|
# tcl::HistRedo --
|
|
#
|
|
# Fetch the previous or specified event, execute it, and then replace
|
|
# the current history item with that event.
|
|
#
|
|
# Parameters:
|
|
# event (optional) index of history item to redo. Defaults to -1,
|
|
# which means the previous event.
|
|
#
|
|
# Results:
|
|
# Those of the command being redone.
|
|
#
|
|
# Side Effects:
|
|
# Replaces the current history list item with the one being redone.
|
|
|
|
proc ::tcl::HistRedo {{event -1}} {
|
|
variable history
|
|
|
|
set i [HistIndex $event]
|
|
if {$i == $history(nextid)} {
|
|
return -code error "cannot redo the current event"
|
|
}
|
|
set cmd $history($i)
|
|
HistChange $cmd 0
|
|
tailcall eval $cmd
|
|
}
|
|
|
|
# tcl::HistIndex --
|
|
#
|
|
# Map from an event specifier to an index in the history list.
|
|
#
|
|
# Parameters:
|
|
# event index of history item to redo.
|
|
# If this is a positive number, it is used directly.
|
|
# If it is a negative number, then it counts back to a previous
|
|
# event, where -1 is the most recent event.
|
|
# A string can be matched, either by being the prefix of a
|
|
# command or by matching a command with string match.
|
|
#
|
|
# Results:
|
|
# The index into history, or an error if the index didn't match.
|
|
|
|
proc ::tcl::HistIndex {event} {
|
|
variable history
|
|
if {![string is integer -strict $event]} {
|
|
for {set i [expr {$history(nextid)-1}]} {[info exists history($i)]} \
|
|
{incr i -1} {
|
|
if {[string match $event* $history($i)]} {
|
|
return $i
|
|
}
|
|
if {[string match $event $history($i)]} {
|
|
return $i
|
|
}
|
|
}
|
|
return -code error "no event matches \"$event\""
|
|
} elseif {$event <= 0} {
|
|
set i [expr {$history(nextid) + $event}]
|
|
} else {
|
|
set i $event
|
|
}
|
|
if {$i <= $history(oldest)} {
|
|
return -code error "event \"$event\" is too far in the past"
|
|
}
|
|
if {$i > $history(nextid)} {
|
|
return -code error "event \"$event\" hasn't occured yet"
|
|
}
|
|
return $i
|
|
}
|
|
|
|
# tcl::HistEvent --
|
|
#
|
|
# Map from an event specifier to the value in the history list.
|
|
#
|
|
# Parameters:
|
|
# event index of history item to redo. See index for a description of
|
|
# possible event patterns.
|
|
#
|
|
# Results:
|
|
# The value from the history list.
|
|
|
|
proc ::tcl::HistEvent {{event -1}} {
|
|
variable history
|
|
set i [HistIndex $event]
|
|
if {![info exists history($i)]} {
|
|
return ""
|
|
}
|
|
return [string trimright $history($i) \ \n]
|
|
}
|
|
|
|
# tcl::HistChange --
|
|
#
|
|
# Replace a value in the history list.
|
|
#
|
|
# Parameters:
|
|
# newValue The new value to put into the history list.
|
|
# event (optional) index of history item to redo. See index for a
|
|
# description of possible event patterns. This defaults to 0,
|
|
# which specifies the current event.
|
|
#
|
|
# Side Effects:
|
|
# Changes the history list.
|
|
|
|
proc ::tcl::HistChange {newValue {event 0}} {
|
|
variable history
|
|
set i [HistIndex $event]
|
|
set history($i) $newValue
|
|
}
|
|
|
|
# tcl::HistNextID --
|
|
#
|
|
# Returns the number of the next history event.
|
|
#
|
|
# Parameters:
|
|
# None.
|
|
#
|
|
# Side Effects:
|
|
# None.
|
|
|
|
proc ::tcl::HistNextID {} {
|
|
variable history
|
|
return [expr {$history(nextid) + 1}]
|
|
}
|
|
|
|
return
|
|
|
|
# Local Variables:
|
|
# mode: tcl
|
|
# fill-column: 78
|
|
# End:
|
|
|