/usr/bin/expect_tknewsbiff is in expect 5.45-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# -*- tcl -*-
# The next line is executed by /bin/sh, but not tcl \
exec tclsh8.6 "$0" ${1+"$@"}
package require Expect
package require Tk
# Name: tknewsbiff
# Author: Don Libes
# Version: 1.2b
# Written: January 1, 1994
# Description: When unread news appears in your favorite groups, pop up
# a little window describing which newsgroups and how many articles.
# Go away when articles are no longer unread.
# Optionally, run a UNIX program (to play a sound, read news, etc.)
# Default config file in ~/.tknewsbiff[-host]
# These two procedures are needed because Tk provides no command to undo
# the "wm unmap" command. You must remember whether it was iconic or not.
# PUBLIC
proc unmapwindow {} {
global _window_open
switch [wm state .] \
iconic {
set _window_open 0
} normal {
set _window_open 1
}
wm withdraw .
}
unmapwindow
# window state starts out as "iconic" before it is mapped, Tk bug?
# make sure that when we map it, it will be open (i.e., "normal")
set _window_open 1
# PUBLIC
proc mapwindow {} {
global _window_open
if {$_window_open} {
wm deiconify .
} else {
wm iconify .
}
}
proc _abort {msg} {
global argv0
puts "$argv0: $msg"
exit 1
}
if {[info exists env(DOTDIR)]} {
set home $env(DOTDIR)
} else {
set home [glob ~]
}
set delay 60
set width 27
set height 10
set _default_config_file $home/.tknewsbiff
set _config_file $_default_config_file
set _default_server news
set server $_default_server
set server_timeout 60
log_user 0
listbox .list -yscroll ".scrollbar set" -font "*-m-*" -setgrid 1
scrollbar .scrollbar -command ".list yview" -relief raised
.list config -highlightthickness 0 -border 0
.scrollbar config -highlightthickness 0
pack .scrollbar -side left -fill y
pack .list -side left -fill both -expand 1
while {[llength $argv]>0} {
set arg [lindex $argv 0]
if {[file readable $arg]} {
if {0==[string compare active [file tail $arg]]} {
set active_file $arg
set argv [lrange $argv 1 end]
} else {
# must be a config file
set _config_file $arg
set argv [lrange $argv 1 end]
}
} elseif {[file readable $_config_file-$arg]} {
# maybe it's a hostname suffix for a newsrc file?
set _config_file $_default_config_file-$arg
set argv [lrange $argv 1 end]
} else {
# maybe it's just a hostname for regular newsrc file?
set server $arg
set argv [lrange $argv 1 end]
}
}
proc _read_config_file {} {
global _config_file argv0 watch_list ignore_list
# remove previous user-provided proc in case user simply
# deleted it from config file
proc user {} {}
set watch_list {}
set ignore_list {}
if {[file exists $_config_file]} {
# uplevel allows user to set global variables
if {[catch {uplevel source $_config_file} msg]} {
_abort "error reading $_config_file\n$msg"
}
}
if {[llength $watch_list]==0} {
watch *
}
}
# PUBLIC
proc watch {args} {
global watch_list
lappend watch_list $args
}
# PUBLIC
proc ignore {ng} {
global ignore_list
lappend ignore_list $ng
}
# get time and server
_read_config_file
# if user didn't set newsrc, try ~/.newsrc-server convention.
# if that fails, fall back to just plain ~/.newsrc
if {![info exists newsrc]} {
set newsrc $home/.newsrc-$server
if {![file readable $newsrc]} {
set newsrc $home/.newsrc
if {![file readable $newsrc]} {
_abort "cannot tell what newgroups you read
found neither $home/.newsrc-$server nor $home/.newsrc"
}
}
}
# PRIVATE
proc _read_newsrc {} {
global db newsrc
if {[catch {set file [open $newsrc]} msg]} {
_abort $msg
}
while {-1 != [gets $file buf]} {
if {[regexp "!" $buf]} continue
if {[regexp "(\[^:]*):.*\[-, ](\[0-9]+)" $buf dummy ng seen]} {
set db($ng,seen) $seen
}
# only way 2nd regexp can fail is on lines
# that have a : but no number
}
close $file
}
proc _unknown_host {} {
global server _default_server
if {0==[string compare $_default_server $server]} {
puts "tknewsbiff: default server <$server> is not known"
} else {
puts "tknewsbiff: server <$server> is not known"
}
puts "Give tknewsbiff an argument - either the name of your news server
or active file. I.e.,
tknewsbiff news.nist.gov
tknewsbiff /usr/news/lib/active
If you have a correctly defined configuration file (.tknewsbiff),
an argument is not required. See the man page for more info."
exit 1
}
# read active file
# PRIVATE
proc _read_active {} {
global db server active_list active_file
upvar #0 server_timeout timeout
set active_list {}
if {[info exists active_file]} {
spawn -open [open $active_file]
} else {
spawn telnet $server nntp
expect {
"20*\n" {
# should get 200 or 201
} "NNTP server*\n" {
puts "tknewsbiff: unexpected response from server:"
puts "$expect_out(buffer)"
return 1
} "unknown host" {
_unknown_host
} timeout {
close
wait
return 1
} eof {
# loadav too high probably
wait
return 1
}
}
exp_send "list\r"
expect "list\r\n" ;# ignore echo of "list" command
expect -re "215\[^\n]*\n" ;# skip "Newsgroups in form" line
}
expect {
-re "(\[^ ]*) 0*(\[^ ]+) \[^\n]*\n" {
set ng $expect_out(1,string)
set hi $expect_out(2,string)
lappend active_list $ng
set db($ng,hi) $hi
exp_continue
}
".\r\n" close
".\r\r\n" close
timeout close
eof
}
wait
return 0
}
# test in various ways for good newsgroups
# return 1 if good, 0 if not good
# PRIVATE
proc _isgood {ng threshold} {
global db seen_list ignore_list
# skip if we don't subscribe to it
if {![info exists db($ng,seen)]} {return 0}
# skip if the threshold isn't exceeded
if {$db($ng,hi) - $db($ng,seen) < $threshold} {return 0}
# skip if it matches an ignore command
foreach igpat $ignore_list {
if {[string match $igpat $ng]} {return 0}
}
# skip if we've seen it before
if {[lsearch -exact $seen_list $ng]!=-1} {return 0}
# passed all tests, so remember that we've seen it
lappend seen_list $ng
return 1
}
# return 1 if not seen on previous turn
# PRIVATE
proc _isnew {ng} {
global previous_seen_list
if {[lsearch -exact $previous_seen_list $ng]==-1} {
return 1
} else {
return 0
}
}
# schedule display of newsgroup in global variable "newsgroup"
# PUBLIC
proc display {} {
global display_list newsgroup
lappend display_list $newsgroup
}
# PRIVATE
proc _update_ngs {} {
global watch_list active_list newsgroup
foreach watch $watch_list {
set threshold 1
set display display
set new {}
set ngpat [lindex $watch 0]
set watch [lrange $watch 1 end]
while {[llength $watch] > 0} {
switch -- [lindex $watch 0] \
-threshold {
set threshold [lindex $watch 1]
set watch [lrange $watch 2 end]
} -display {
set display [lindex $watch 1]
set watch [lrange $watch 2 end]
} -new {
set new [lindex $watch 1]
set watch [lrange $watch 2 end]
} default {
_abort "watch: expecting -threshold -display or -new but found: [lindex $watch 0]"
}
}
foreach ng $active_list {
if {[string match $ngpat $ng]} {
if {[_isgood $ng $threshold]} {
if {[llength $display]} {
set newsgroup $ng
uplevel $display
}
if {[_isnew $ng]} {
if {[llength $new]} {
set newsgroup $ng
uplevel $new
}
}
}
}
}
}
}
# initialize display
set min_reasonable_width 8
wm minsize . $min_reasonable_width 1
wm maxsize . 999 999
if {0 == [info exists active_file] &&
0 != [string compare $server $_default_server]} {
wm title . "news@$server"
wm iconname . "news@$server"
}
# PRIVATE
proc _update_window {} {
global server display_list height width min_reasonable_width
if {0 == [llength $display_list]} {
unmapwindow
return
}
# make height correspond to length of display_list or
# user's requested max height, whichever is smaller
if {[llength $display_list] < $height} {
set current_height [llength $display_list]
} else {
set current_height $height
}
# force reasonable min width
if {$width < $min_reasonable_width} {
set width $min_reasonable_width
}
wm geometry . ${width}x$current_height
wm maxsize . 999 [llength $display_list]
_display_ngs $width
if {[string compare [wm state .] withdrawn]==0} {
mapwindow
}
}
# actually write all newsgroups to the window
# PRIVATE
proc _display_ngs {width} {
global db display_list
set str_width [expr $width-7]
.list delete 0 end
foreach ng $display_list {
.list insert end [format \
"%-$str_width.${str_width}s %5d" $ng \
[expr $db($ng,hi) - $db($ng,seen)]]
}
}
# PUBLIC
proc help {} {
catch {destroy .help}
toplevel .help
message .help.text -aspect 400 -text \
{tknewsbiff - written by Don Libes, NIST, 1/1/94
tknewsbiff displays newsgroups with unread articles based on your .newsrc\
and your .tknewsbiff files.\
If no articles are unread, no window is displayed.
Click mouse button 1 for this help,\
button 2 to force display to query news server immediately,\
and button 3 to remove window from screen until the next update.
Example .tknewsbiff file:}
message .help.sample -font "*-r-normal-*-m-*" \
-relief raised -aspect 10000 -text \
{set width 30 ;# max width, defaults to 27
set height 17 ;# max height, defaults to 10
set delay 120 ;# in seconds, defaults to 60
set server news.nist.gov ;# defaults to "news"
set server_timeout 60 ;# in seconds, defaults to 60
set newsrc ~/.newsrc ;# defaults to ~/.newsrc
;# after trying ~/.newsrc-$server
# Groups to watch.
watch comp.lang.tcl
watch dc.dining -new "play yumyum"
watch nist.security -new "exec red-alert"
watch nist.*
watch dc.general -threshold 5
watch *.sources.* -threshold 20
watch alt.howard-stern -threshold 100 -new "play robin"
# Groups to ignore (but which match patterns above).
# Note: newsgroups that you don't read are ignored automatically.
ignore *.d
ignore nist.security
ignore nist.sport
# Change background color of newsgroup list
.list config -bg honeydew1
# Play a sound file
proc play {sound} {
exec play /usr/local/lib/sounds/$sound.au
}}
message .help.end -aspect 10000 -text \
"Other customizations are possible. See man page for more information."
button .help.ok -text "ok" -command {destroy .help}
pack .help.text
pack .help.sample
pack .help.end -anchor w
pack .help.ok -fill x -padx 2 -pady 2
}
spawn cat -u; set _cat_spawn_id $spawn_id
set _update_flag 0
# PUBLIC
proc update-now {} {
global _update_flag _cat_spawn_id
if {$_update_flag} return ;# already set, do nothing
set _update_flag 1
exp_send -i $_cat_spawn_id "\r"
}
bind .list <1> help
bind .list <2> update-now
bind .list <3> unmapwindow
bind .list <Configure> {
scan [wm geometry .] "%%dx%%d" w h
_display_ngs $w
}
# PRIVATE
proc _sleep {timeout} {
global _cat_spawn_id _update_flag
set _update_flag 0
# restore to idle cursor
.list config -cursor ""; update
# sleep for a little while, subject to click from "update" button
expect -i $_cat_spawn_id -re "...." ;# two crlfs
# change to busy cursor
.list config -cursor watch; update
}
set previous_seen_list {}
set seen_list {}
# PRIVATE
proc _init_ngs {} {
global display_list db
global seen_list previous_seen_list
set previous_seen_list $seen_list
set display_list {}
set seen_list {}
catch {unset db}
}
for {} {1} {_sleep $delay} {
_init_ngs
_read_newsrc
if {[_read_active]} continue
_read_config_file
_update_ngs
user
_update_window
}
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