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|
#!/usr/bin/env tclsh
## -*- tcl -*-
package require Tcl 8.5
package require nntp
package require fileutil
# This application connects to an nntp server and retrieves all
# messages it currently has for a named group. Both are specified as
# command line arguments. All retrieved messages are fed into the
# command specified as the third and further arguments, via a pipe.
# That command is responsible for storing the message as it sees fit.
# Signature (syntax) of the storage command:
#
# (1) <cmd> last => Returns last id processed.
# (2) <cmd> save <id> => Take message through stdin, and save, mark <id> as last.
proc main {} {
if {![cmdline]} usage
pullmessages
}
proc cmdline {} {
global argv newsserver newsgroup user password storecommand
if {[lindex $argv 0] eq "-via"} {
if {[llength $argv] < 5} {return 0}
set argv [lassign $argv _ accountfile]
lassign [split [validatefile {account file} $accountfile] \n] user password
}
if {[llength $argv] < 3} {return 0}
# Retrieve arguments
set storecommand [lassign $argv newsserver newsgroup]
if {![llength $storecommand]} { return 0 }
return 1
}
proc validatefile {which path} {
if {![file exists $path]} { stop "$which does not exist: $path" }
if {![file isfile $path]} { stop "$which not a file: $path" }
if {![file readable $path]} { stop "$which not readable: $path" }
return [fileutil::cat $path]
}
proc usage {} {
global argv0
puts stderr "$argv0: wrong # args, should be \"$argv0 ?-via accountfile? server group cmd...\""
exit 1
}
proc stop {text} {
global argv0
puts stderr "$argv0: $text"
exit 1
}
proc pullmessages {} {
global newsserver newsgroup user password
nntp_cmd 1 {open } {set news [nntp::nntp $newsserver]}
nntp_cmd 1 {mode reader} {$news mode_reader}
if {[info exists user]} {
nntp_cmd 1 {authinfo } {$news authinfo $user $password}
}
nntp_cmd 1 {group info } {
set info [$news group $newsgroup]
}
lassign $info total firstid lastid _
set n [string length $lastid]
# TODO: iterate over all messages we have no seen yet.
set lasthandled [store_cmd {} last]
if {$lasthandled eq {}} {
set lasthandled $firstid
incr lasthandled -1
}
while {$lasthandled < $lastid} {
incr lasthandled
if {![nntp_cmd 0 "get [format %${n}d $lasthandled]" {
set lines [$news article $lasthandled]
set x ok
}]} continue
store_cmd [join $lines \n] save $lasthandled
}
nntp_cmd 1 {quit } {$news quit}
return
}
proc store_cmd {si args} {
global storecommand
if {$si ne {}} {
return [exec << $si {*}$storecommand {*}$args]
} else {
return [exec {*}$storecommand {*}$args]
}
}
proc nntp_cmd {exit title cmd {oktitle {}}} {
global argv0
puts -nonewline stdout $title
flush stdout
if {[catch {
set res [uplevel 1 $cmd]
} msg]} {
puts stdout " error: $msg"
#puts stderr "$argv0: nntp error: $msg"
if {$exit} {
exit 1
}
return 0
} else {
if {$oktitle != {}} {
puts stdout " $res $oktitle"
} else {
puts stdout " $res"
}
return 1
}
}
main
exit
|
