#-----------------------------------------------------------------------------
# This file implements a LogBook facility for SICS. 
# Usage:
# LogBook             - lists the current status
# LogBook  filename   - sets the logbook file name
# LogBook  on         - starts logging, creates new file
# LogBook  off        - closes log file
#
# Mark Koennecke, June 1997, initially developed for SANS
# works using one procedure and an array for data. All internal procedures 
# start with cli 
#----------------------------------------------------------------------------

set  cliArray(file) default.log
set  cliArray(status) off
set  cliArray(number) 0
#---------------------------------------------------------------------------
proc cliList { } {
     global cliArray
#     ClientPut [format " LogBook file: %s\n" $cliArray(file)] 
#     ClientPut [format " Logging: %s "  $cliArray(status)] ]
      append res [format " LogBook file: %s\n" $cliArray(file)] \
             [format " Logging: %s "  $cliArray(status)] 
      return $res
}
#-------------------------------------------------------------------------
proc cliLogOn { } {
     global cliArray
     set cmd [list config File $cliArray(file)]
     set ret [catch {eval $cmd} msg]
     if { $ret != 0 } {
       error $msg
     } else {
      set l [ split $msg = ]
      set cliArray(number) [lindex $l 1]
      set cliArray(status) on
     }
}
#--------------------------------------------------------------------------
proc cliLogOff { } {
     global cliArray
     set cmd [list config close $cliArray(number)]
     set ret [catch {eval $cmd} msg]
     if { $ret != 0 } {
       error $msg
     } else {
       set cliArray(status) off
     }
}
#-------------------------------------------------------------------------
proc logbook args { 
     global cliArray
#---- first case: a listing
     if { [llength $args] == 0} {
        return  [cliList] 
     }
#---- there must be an argument
     set argument [lindex $args 0]
#---- on/ off
     if {[string compare "on" $argument] == 0} {
        set ret [catch {cliLogOn} msg]
        if { $ret != 0 } {
           error $msg
        } else {
           ClientPut OK
        }
     } elseif {[string compare "off" $argument] == 0} {
        set ret [catch {cliLogOff} msg]
        if { $ret != 0 } {
          error $msg
        } else {
           ClientPut OK
        }
    } elseif {[string compare "file" $argument] >= 0} {
      if {[llength $args] < 1} {
        error "ERROR: nor filename specified for LogBook"
      } 
      set cliArray(file) [lindex $args 1]
    } elseif {[string compare "no" $argument] == 0} {
      ClientPut $cliArray(number)
    } else {
      error [format "ERROR: unknown argument %s to LogBook" $argument]
    }
}