Core.tcl
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	#
	# TCL helpers
	#

	#Determines if $proc exists
	proc proc_exists {proc} {
	expr {[info procs $proc] == $proc}
	}

	#
	# Trivial procs
	#

	#Determines if $v is a number
	proc isnumber {v} {
	return [expr {! [catch {expr {int($v)}}]}]
	}

	#Returns "s" if $count implies a plural
	#TODO: keep this method for French (ie NOT adjusting values for English)
	# and grab the plural proc from wiki.tcl.tk for English.
	proc s {count} {
	if {$count >= 2 \|\| $count <= 2} {return "s"}
	}

	#
	# Strings
	#

	#Completes $text by spaces or $char so the returned text length is $len
	proc completestring {text len {char " "}} {
	set curlen [string length $text]
	if {$curlen >= $len} {
	return $text
	}
	if {[string length $char] < 2} {
	append text [string repeat $char [expr $len - $curlen]]
	} {
	while {[string length $text] < $len} {
	append text $char
	}
	string range $text 0 $len+1
	}
	}

	proc completestringright {text len {char " "}} {
	set curlen [string length $text]
	if {$curlen >= $len} {
	return $text
	}
	set completedtext [string range [completestring $text $len $char] $curlen end]
	append completedtext $text
	}

	## Prepends 0s to a number
	##
	## @param $number The number to zerofill
	## @param $digits The number length
	## @return The zerofilled number
	proc zerofill {number digits} {
	format "%0${digits}d" $number
	}

	#
	# SQL
	#

	#Reconnects to the sql & sql2 server
	proc sqlrehash {} {
	global sql
	catch {
	sql disconnect
	sql2 disconnect
	}
	sql connect $sql(host) $sql(user) $sql(pass)
	sql2 connect $sql(host) $sql(user) $sql(pass)
	sql selectdb $sql(database)
	sql2 selectdb $sql(database)
	}

	#Escape a string to use as sql query parameter
	proc sqlescape {data} {
	#\ -> \\
	#' -> \'
	string map {"\\" "\\\\" "'" "\\'"} $data

	}

	#Gets the first item of the first row of a sql query (scalar results)
	proc sqlscalar {sql} {
	lindex [lindex [sql $sql] 0] 0
	}

	#Adds specified data to specified SQL table
	proc sqladd {table {data1 ""} {data2 ""}} {
	if {$data1 == ""} {
	set fields ""
	#Prints field to fill
	foreach row [sql "SHOW COLUMNS FROM $table"] {
	lappend fields [lindex $row 0]
	}
	return $fields
	}

	if {$data2 == ""} {
	set sql "INSERT INTO $table VALUES ("
	set data $data1
	} {
	set sql "INSERT INTO $table (`[join $data1 "`, `"]`) VALUES ("
	set data $data2
	}
	set first 1
	foreach value $data {
	if {$first == 1} {set first 0} {append sql ", "}
	append sql "'[sqlescape $value]'"
	}
	append sql ")"
	sql $sql
	}

	# Gets the value of the AUTOINCREMENT column for the last INSERT
	#
	# @return the last value of the primary key
	proc sqllastinsertid {} {
	sql "SELECT LAST_INSERT_ID()"
	}

	#
	# Registry
	#

	#Gets, sets, deletes or increments a registry value
	proc registry {command key {value ""}} {
	switch -- $command {
	"add" {
	sqladd registry "data value" [list $key $value]
	}

	"get" {
	sqlscalar "SELECT value FROM registry WHERE `data` = '$key'"
	}

	"set" {
	sqlreplace registry "data value" [list $key $value]
	}

	"del" {
	registry delete $key $value
	}

	"delete" {
	set sql "DELETE FROM registry WHERE `data` = '$key'"
	putdebug $sql
	sql $sql
	}

	"incr" {
	set current [registry get $key]
	if {$value == ""} {set term 1}
	if {$current == ""} {
	registry set $key $term
	} {
	registry set $key [incr current $term]
	}
	}

	default {
	error "unknown subcommand: must be add, get, set, incr or delete"
	}
	}
	}

	#
	# Users information
	#

	#Gets user_id from a username, idx or user_id
	proc getuserid {data} {
	if {$data == ""} {
	return
	} elseif {![isnumber $data]} {
	#username -> user_id
	sql "SELECT user_id FROM users WHERE username = '[sqlescape $data]'"
	} elseif {$data < 1000} {
	#idx -> user_id
	getuserid [idx2hand $data]
	} else {
	#user_id -> user_id (or "" if not existing)
	sql "SELECT user_id FROM users WHERE user_id = $data"
	}
	}

	#
	# Text parsing
	#

	proc geturls {text} {
	#Finds the first url position
	set pos -1
	foreach needle "http:// https:// www. youtu.be" {
	set pos1 [string first $needle $text]
	if {$pos1 != -1 && ($pos == -1 \|\| $pos1 < $pos)} {
	set pos $pos1
	}
	}

	#No URL found
	if {$pos == -1} {return}

	#URL found
	set pos2 [string first " " $text $pos]
	if {$pos2 == -1} {
	#Last URL to be found
	string range $text $pos end
	} {
	#Recursive call to get other URLs
	concat [string range $text $pos $pos2-1] [geturls [string range $text $pos2+1 end]]
	}
	}

	#Reads specified URL and returns content
	proc geturltext {url {trim 1}} {
	package require http
	if {[string range [string tolower $url] 0 5] == "https:"} {
	package require tls
	http::register https 443 tls::socket
	}

	set fd [http::geturl $url]
	set text [http::data $fd]
	http::cleanup $fd
	if $trim {
	string trim $text
	} {
	return $text
	}
	}

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