#!/usr/local/bin/tclsh
# -*- tcl -*-
#
# This application is like 'postit', but written in tcl.
# The only package used is 'nntp' from 'tcllib'.
#
# Takes two arguments: 
# 1) The path to the file listing the articles to push
#    into the NNTP network
# 2) The name of the newsserver to push the articles to.
#
# The path to the spool directory is 1 level above the
# article file.

# Check number of arguments

if {[llength $argv] != 2} {
    puts stderr "$argv0: wrong # args, should be \"$argv0 articles newsserver\""
    exit 1
}

# Retrieve arguments

set articlefile [lindex $argv 0]
set newsserver  [lindex $argv 1]

# Validate file

if {![file exists $articlefile]} {
    puts stderr "$argv0: $articlefile does not exist"
    exit 1
}
if {[file isdirectory $articlefile]} {
    puts stderr "$argv0: $articlefile is not a file"
    exit 1
}
if {![file readable $articlefile]} {
    puts stderr "$argv0: $articlefile is not readable"
    exit 1
}

# Get path and article information

set spoolpath [file dirname [file dirname [file join [pwd] $articlefile]]]
set articles  [split [read [set fh [open $articlefile r]]][close $fh] \n]

puts "spooling from $spoolpath"

# Now we are ready to deal with the newsserver

package require nntp ; # from tcllib

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
    }
}

# Introduce us to the server

nntp_cmd 1 {open       } {set news [nntp::nntp $newsserver]}
nntp_cmd 1 {mode reader} {$news mode_reader}

# Iterate over all articles in the file.

set lastgroup {}

foreach article $articles {
    set article [string trim $article]
    if {$article == {}} {continue}

    foreach {msgfile id} [split $article] {break}

    # We have to validate the message files too.
    # Invalid files are skipped.

    set msgpath [file join $spoolpath $msgfile]

    if {![file exists $msgpath]} {
	puts stderr "article error: $msgfile does not exist"
	continue
    }
    if {[file isdirectory $msgpath]} {
	puts stderr "article error: $msgfile is not a file"
	continue
    }
    if {![file readable $msgpath]} {
	puts stderr "article error: $msgfile is not readable"
	continue
    }

    set group [join [file split [file dirname $msgfile]] .]

    if {[string compare $group $lastgroup] != 0} {

	if {![nntp_cmd 0 {set group  } {$news group $group}]} {
	    # Group does not exist or other error.
	    # Skip the article, can't post it.
	    continue
	}

	set lastgroup $group
    }

    # Group of the message is current, the message file itself is valid.
    # Proceed and check for existence of the article on the server.
    #                mode reader
    if {[nntp_cmd 0 {stat       } {$news stat $id} {article is present, skip}]} {
	continue
    }

    #continue

    if {[catch {
	set msg [read [set fh [open $msgpath r]]][close $fh]
    }]} {
	puts stderr "article error: $msgfile was deleted between check and actual posting"
        continue
    }

    puts stdout "post [llength [split $msg \n]] lines $id"

    nntp_cmd 0 {post       } {$news post $msg}
}

nntp_cmd 1 {quit       } {$news quit}
exit
