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-
-
- namespace eval tcl {
- variable history
- if {![info exists history]} {
- array set history {
- nextid 0
- keep 20
- oldest -20
- }
- }
- }
-
-
- proc history {args} {
- set len [llength $args]
- if {$len == 0} {
- return [tcl::HistInfo]
- }
- set key [lindex $args 0]
- set options "add, change, clear, event, info, keep, nextid, or redo"
- switch -glob -- $key {
- a* { # history add
-
- if {$len > 3} {
- return -code error "wrong # args: should be \"history add event ?exec?\""
- }
- if {![string match $key* add]} {
- return -code error "bad option \"$key\": must be $options"
- }
- if {$len == 3} {
- set arg [lindex $args 2]
- if {! ([string match e* $arg] && [string match $arg* exec])} {
- return -code error "bad argument \"$arg\": should be \"exec\""
- }
- }
- return [tcl::HistAdd [lindex $args 1] [lindex $args 2]]
- }
- ch* { # history change
-
- if {($len > 3) || ($len < 2)} {
- return -code error "wrong # args: should be \"history change newValue ?event?\""
- }
- if {![string match $key* change]} {
- return -code error "bad option \"$key\": must be $options"
- }
- if {$len == 2} {
- set event 0
- } else {
- set event [lindex $args 2]
- }
-
- return [tcl::HistChange [lindex $args 1] $event]
- }
- cl* { # history clear
-
- if {($len > 1)} {
- return -code error "wrong # args: should be \"history clear\""
- }
- if {![string match $key* clear]} {
- return -code error "bad option \"$key\": must be $options"
- }
- return [tcl::HistClear]
- }
- e* { # history event
-
- if {$len > 2} {
- return -code error "wrong # args: should be \"history event ?event?\""
- }
- if {![string match $key* event]} {
- return -code error "bad option \"$key\": must be $options"
- }
- if {$len == 1} {
- set event -1
- } else {
- set event [lindex $args 1]
- }
- return [tcl::HistEvent $event]
- }
- i* { # history info
-
- if {$len > 2} {
- return -code error "wrong # args: should be \"history info ?count?\""
- }
- if {![string match $key* info]} {
- return -code error "bad option \"$key\": must be $options"
- }
- return [tcl::HistInfo [lindex $args 1]]
- }
- k* { # history keep
-
- if {$len > 2} {
- return -code error "wrong # args: should be \"history keep ?count?\""
- }
- if {$len == 1} {
- return [tcl::HistKeep]
- } else {
- set limit [lindex $args 1]
- if {[catch {expr {~$limit}}] || ($limit < 0)} {
- return -code error "illegal keep count \"$limit\""
- }
- return [tcl::HistKeep $limit]
- }
- }
- n* { # history nextid
-
- if {$len > 1} {
- return -code error "wrong # args: should be \"history nextid\""
- }
- if {![string match $key* nextid]} {
- return -code error "bad option \"$key\": must be $options"
- }
- return [expr {$tcl::history(nextid) + 1}]
- }
- r* { # history redo
-
- if {$len > 2} {
- return -code error "wrong # args: should be \"history redo ?event?\""
- }
- if {![string match $key* redo]} {
- return -code error "bad option \"$key\": must be $options"
- }
- return [tcl::HistRedo [lindex $args 1]]
- }
- default {
- return -code error "bad option \"$key\": must be $options"
- }
- }
- }
-
-
- proc tcl::HistAdd {command {exec {}}} {
- variable history
-
- if {[string trim $command] eq ""} {
- return ""
- }
-
- set i [incr history(nextid)]
- set history($i) $command
- set j [incr history(oldest)]
- unset -nocomplain history($j)
- if {[string match e* $exec]} {
- return [uplevel #0 $command]
- } else {
- return {}
- }
- }
-
-
- proc tcl::HistKeep {{limit {}}} {
- variable history
- if {$limit eq ""} {
- return $history(keep)
- } else {
- set oldold $history(oldest)
- set history(oldest) [expr {$history(nextid) - $limit}]
- for {} {$oldold <= $history(oldest)} {incr oldold} {
- unset -nocomplain history($oldold)
- }
- set history(keep) $limit
- }
- }
-
-
- proc tcl::HistClear {} {
- variable history
- set keep $history(keep)
- unset history
- array set history [list nextid 0 keep $keep oldest -$keep ]
- }
-
-
- proc tcl::HistInfo {{num {}}} {
- variable history
- if {$num eq ""} {
- set num [expr {$history(keep) + 1}]
- }
- set result {}
- set newline ""
- for {set i [expr {$history(nextid) - $num + 1}]} {$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 $result
- }
-
-
- proc tcl::HistRedo {{event -1}} {
- variable history
- if {$event eq ""} {
- set event -1
- }
- set i [HistIndex $event]
- if {$i == $history(nextid)} {
- return -code error "cannot redo the current event"
- }
- set cmd $history($i)
- HistChange $cmd 0
- uplevel #0 $cmd
- }
-
-
- proc tcl::HistIndex {event} {
- variable history
- if {[catch {expr {~$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
- }
-
-
- proc tcl::HistEvent {event} {
- variable history
- set i [HistIndex $event]
- if {[info exists history($i)]} {
- return [string trimright $history($i) \ \n]
- } else {
- return "";
- }
- }
-
-
- proc tcl::HistChange {cmd {event 0}} {
- variable history
- set i [HistIndex $event]
- set history($i) $cmd
- }
-