#!/bin/awk -f
# $Revision$, $Date$
# TODO: "SourceXDownload" support (use given URLs if present instead of cut-down SourceX URLs)

function fixedsub(s1,s2,t,	ind) {
# substitutes fixed strings (not regexps)
	if (ind = index(t,s1)) {
		t = substr(t, 1, ind-1) s2 substr(t, ind+length(s1))
	}
	return t
}

function ispre(s) {
	if ((s~"pre")||(s~"PRE")||(s~"beta")||(s~"BETA")||(s~"alpha")||(s~"ALPHA")||(s~"rc")||(s~"RC")) {
		if (DEBUG) print "pre-version"
		return 1
	} else {
		return 0
	}
}

function compare_ver(v1,v2) {
# compares version numbers
	while (match(v1,/[a-zA-Z][0-9]|[0-9][a-zA-Z]/))
		v1=(substr(v1,1,RSTART) "." substr(v1,RSTART+RLENGTH-1))
	while (match(v2,/[a-zA-Z][0-9]|[0-9][a-zA-Z]/))
		v2=(substr(v2,1,RSTART) "." substr(v2,RSTART+RLENGTH-1))
	sub("^0*","",v1)
	sub("^0*","",v2)
	gsub("\.0*",".",v1)
	gsub("\.0*",".",v2)
	if (DEBUG) print "v1 == " v1
	if (DEBUG) print "v2 == " v2
	count=split(v1,v1a,"\.")
	count2=split(v2,v2a,"\.")

	if (count<count2) mincount=count
	else mincount=count2

	for (i=1; i<=mincount; i++) {
		if (v1a[i]=="") v1a[i]=0
		if (v2a[i]=="") v2a[i]=0
		if (DEBUG) print "i == " i
		if (DEBUG) print "v1[i] == " v1a[i]
		if (DEBUG) print "v2[i] == " v2a[i]
		if ((v1a[i]~/[0-9]/)&&(v2a[i]~/[0-9]/)) {
			if (length(v2a[i])>length(v1a[i]))
				return 1
			else if (v2a[i]>v1a[i])
				return 1
			else if (length(v1a[i])>length(v2a[i]))
				return 0
			else if (v1a[i]>v2a[i])
				return 0
		} else if ((v1a[i]~/[A-Za-z]/)&&(v2a[i]~/[A-Za-z]/)) {
			if (v2a[i]>v1a[i])
				return 1
			else if (v1a[i]>v2a[i])
				return 0
		} else if (ispre(v1a[i]) == 1)
			return 1
		else
			return 0
	}
	if ((count2==mincount)&&(count!=count2)) {
		for (i=count2+1; i<=count; i++)
			if (ispre(v1a[i]) == 1)
				return 1
		return 0
	} else if (count!=count2) {
		for (i=count+1; i<=count2; i++)
			if (ispre(v2a[i]) == 1)
				return 0
		return 1
	}
	return 0
}

function compare_ver_dec(v1,v2) {
# compares version numbers as decimal floats
	while (match(v1,/[0-9][a-zA-Z]/))
		v1=(substr(v1,1,RSTART) "." substr(v1,RSTART+RLENGTH-1))
	while (match(v2,/[0-9][a-zA-Z]/))
		v2=(substr(v2,1,RSTART) "." substr(v2,RSTART+RLENGTH-1))
	sub("^0*","",v1)
	sub("^0*","",v2)
	if (DEBUG) print "v1 == " v1
	if (DEBUG) print "v2 == " v2
	count=split(v1,v1a,"\.")
	count2=split(v2,v2a,"\.")

	if (count<count2) mincount=count
	else mincount=count2

	for (i=1; i<=mincount; i++) {
		if (v1a[i]=="") v1a[i]=0
		if (v2a[i]=="") v2a[i]=0
		if (DEBUG) print "i == " i
		if (DEBUG) print "v1[i] == " v1a[i]
		if (DEBUG) print "v2[i] == " v2a[i]
		if ((v1a[i]~/[0-9]/)&&(v2a[i]~/[0-9]/)) {
			if (i==2) {
				if (0+("." v2a[i])>0+("." v1a[i]))
					return 1
				else if (0+("." v1a[i])>0+("." v2a[i]))
					return 0
			} else {
				if (length(v2a[i])>length(v1a[i]))
					return 1
				else if (v2a[i]>v1a[i])
					return 1
				else if (length(v1a[i])>length(v2a[i]))
					return 0
				else if (v1a[i]>v2a[i])
					return 0
			}
		} else if ((v1a[i]~/[A-Za-z]/)&&(v2a[i]~/[A-Za-z]/)) {
			if (v2a[i]>v1a[i])
				return 1
			else if (v1a[i]>v2a[i])
				return 0
		} else if (ispre(v1a[i]) == 1)
			return 1
		else
			return 0
	}
	if ((count2==mincount)&&(count!=count2)) {
		for (i=count2+1; i<=count; i++)
			if (ispre(v1a[i]) == 1)
				return 1
		return 0
	} else if (count!=count2) {
		for (i=count+1; i<=count2; i++)
			if (ispre(v2a[i]) == 1)
				return 0
		return 1
	}
	return 0
}

function get_links(url,	errno,link,oneline,retval,odp,wholeodp,lowerodp,tmpfile) {
# get all <A HREF=..> tags from specified URL
	"mktemp /tmp/XXXXXX" | getline tmpfile
	close("mktemp /tmp/XXXXXX")

	if (url ~ /^http:\/\/(download|dl).(sf|sourceforge).net\//) {
		gsub("^http://(download|dl).(sf|sourceforge).net/", "", url)
		url = "http://prdownloads.sourceforge.net/" substr(url, 1, 1) "/" substr(url, 1, 2) "/" url
		if (DEBUG) print "sf url, mungled url to: " url
	}

	if (DEBUG) print "Retrieving: " url
	errno=system("wget -O - \"" url "\" -t 3 -T 300 --passive-ftp > " tmpfile " 2>/dev/null" )

	if (errno==0) {
		while (getline oneline < tmpfile)
			wholeodp=(wholeodp " " oneline)
		if ( DEBUG ) print "Response: " wholeodp
	}

	close(tmpfile)
	system("rm -f " tmpfile)
	urldir=url;
	sub(/[^\/]+$/,"",urldir)

	if ( errno==0) {
		while (match(wholeodp, /<([aA]|[fF][rR][aA][mM][eE])[ \t][^>]*>/) > 0) {
			odp=substr(wholeodp,RSTART,RLENGTH);
			wholeodp=substr(wholeodp,RSTART+RLENGTH);

			lowerodp=tolower(odp);
			if (lowerodp ~ /<frame[ \t]/) {
				sub(/[sS][rR][cC]=[ \t]*/,"src=",odp);
				match(odp,/src="[^"]+"/)
				newurl=substr(odp,RSTART+5,RLENGTH-6)
				if (DEBUG) print "Frame: " newurl
				if (newurl !~ /\//) {
					newurl=(urldir newurl)
					if (DEBUG) print "Frame->: " newurl
				}
				retval=(retval " " get_links(newurl))
			} else if (lowerodp ~ /href=[ \t]*"[^"]*"/) {
				sub(/[hH][rR][eE][fF]=[ \t]*"/,"href=\"",odp)
				match(odp,/href="[^"]*"/)
				link=substr(odp,RSTART,RLENGTH)
				odp=substr(odp,1,RSTART) substr(odp,RSTART+RLENGTH)
				link=substr(link,7,length(link)-7)
				retval=(retval " " link)
				if (DEBUG) print "href(\"\"): " link
			} else if (lowerodp ~ /href=[ \t]*'[^']*'/) {
				sub(/[hH][rR][eE][fF]=[ \t]*'/,"href='",odp)
				match(odp,/href='[^']*'/)
				link=substr(odp,RSTART,RLENGTH)
				odp=substr(odp,1,RSTART) substr(odp,RSTART+RLENGTH)
				link=substr(link,7,length(link)-7)
				retval=(retval " " link)
				if (DEBUG) print "href(''): " link
			} else if (lowerodp ~ /href=[ \t]*[^ \t>]*/) {
				sub(/[hH][rR][eE][fF]=[ \t]*/,"href=",odp)
				match(odp,/href=[^ \t>]*/)
				link=substr(odp,RSTART,RLENGTH)
				odp=substr(odp,1,RSTART) substr(odp,RSTART+RLENGTH)
				link=substr(link,6,length(link)-5)
				retval=(retval " " link)
				if (DEBUG) print "href(): " link
			} else {
				# <a ...> but not href - skip
				if (DEBUG) print "skipping <a > without href: " odp
			}
		}
	} else {
		retval=("WGET ERROR: " errno)
	}


	if (DEBUG) print "Returning: " retval
	return retval
}

function subst_defines(var,defs) {
# substitute all possible RPM macros
	while ((var ~ /%{.*}/) || (var ~ /%[A-Za-z0-9_]+/)) {
		oldvar=var
		for (j in defs) {
			gsub("%{" j "}", defs[j], var)
			gsub("%" j , defs[j], var)
		}
		if (var==oldvar) {
			if ( DEBUG ) for (i in defs) print i " == " defs[i]
			return var
		}
	}
	return var
}

function find_mirror(url) {

	while (succ = (getline line < "mirrors")) {
	    if (succ==-1) { return url }
		nf=split(line,fields,"|")
		if (nf>1){
			origin=fields[1]
			mirror=fields[2]
			mname=fields[3]
			prefix=substr(url,1,length(origin))
			if (prefix==origin){
				if ( DEBUG ) print "Mirror fount at " mname
				close("mirrors")
				return mirror substr(url,length(origin)+1)
			}
		}
	}

	return url
}

function process_source(number,lurl,name,version) {
# fetches file list, and compares version numbers
	if ( DEBUG ) print "Processing " lurl

	if ( index(lurl,version)==0 ) {
		if (DEBUG) print "There is no version number."
		return 0
	}

	sub("://",":",lurl)
	sub("/",":/",lurl)
	gsub("[^/]*$",":&",lurl)
	split(lurl,url,":")
	acc=url[1]
	host=url[2]
	dir=url[3]
	filename=url[4]

	if (index(dir,version)) {
		dir=substr(dir,1,index(dir,version)-1)
		sub("[^/]*$","",dir)
		sub("(\.tar\.(bz|bz2|gz)|zip)$","",filename)
		if ( DEBUG ) print "Will check a directory: " dir
		if ( DEBUG ) print "and a file: " filename
	}

	filenameexp=filename
	gsub("\+","\\+",filenameexp)
	sub(version,"[A-Za-z0-9.]+",filenameexp)
	gsub("\.","\\.",filenameexp)
	if ( DEBUG ) print "Expression: " filenameexp
	match(filename,version)
	prever=substr(filename,1,RSTART-1)
	postver=substr(filename,RSTART+RLENGTH)
	if ( DEBUG ) print "Before number: " prever
	if ( DEBUG ) print "and after: " postver
	newurl=find_mirror(acc "://" host dir)
	#print acc "://" host dir
	#newurl=url[1]"://"url[2]url[3]url[4]
	#newurl=acc "://" host dir filename
	if ( DEBUG ) print "Looking at " newurl

	references=0
	finished=0
	oldversion=version
	odp=get_links(newurl)
	if( odp ~ "ERROR: ") {
		print name "(" number ") " odp
	} else {
		if (DEBUG) print "WebPage downloaded"
		c=split(odp,linki)
		for (nr=1; nr<=c; nr++) {
			addr=linki[nr]
			if (DEBUG) print "Found link: " addr
			if ((addr ~ filenameexp) && !(addr ~ "[-_.0-9A-Za-z~]" filenameexp)) {
				match(addr,filenameexp)
				newfilename=substr(addr,RSTART,RLENGTH)
				if (DEBUG) print "Hypothetical new: " newfilename
				newfilename=fixedsub(prever,"",newfilename)
				newfilename=fixedsub(postver,"",newfilename)
				if (DEBUG) print "Version: " newfilename
				if (newfilename ~ /\.(pkg|bin|binary|built)$/) continue
				if (NUMERIC) {
					if ( compare_ver_dec(version, newfilename)==1 ) {
						if (DEBUG) print "Yes, there is new one"
						version=newfilename
						finished=1
					}
				} else if ( compare_ver(version, newfilename)==1 ) {
					if (DEBUG) print "Yes, there is new one"
					version=newfilename
					finished=1
				}
			}
		}
		if (finished==0)
			print name "(" number ") seems ok: " oldversion
		else
			print name "(" number ") [OLD] " oldversion " [NEW] " version
	}
}

# upgrade check for pear package using PEAR CLI
function pear_upgrade(name, ver) {
	pname = name;
	sub(/^php-pear-/, "", pname);

	pearcmd = "pear remote-info " pname " | awk '/^Latest/{print $NF}'"
	if (DEBUG) {
		print "pearcmd: " pearcmd
	}
	pearcmd | getline nver
	close(pearcmd)

	if (compare_ver(ver, nver)) {
		print name " [OLD] " ver " [NEW] " nver
	} else {
		print name " seems ok: " ver
	}

	return
}

function process_data(name,ver,rel,src) {
	if (name ~ /^php-pear-/) {
		return pear_upgrade(name, ver);
	}

# this function checks if substitutions were valid, and if true:
# processes each URL and tries to get current file list
	for (i in src) {
		if ( src[i] !~ /%{.*}/ && src[i] !~ /%[A-Za-z0-9_]/ )  {
			if ( DEBUG ) print "Source: " src[i]
			process_source(i,src[i],name,ver)
		} else {
			print FNAME ":" i ": impossible substitution: " src[i]
		}
	}
}

BEGIN {
	# if U want to use DEBUG, run script with "-v DEBUG=1"
	# or uncomment the line below
	# DEBUG = 1

	errno=system("wget --help > /dev/null 2>&1")
	if (errno) {
		print "No wget installed!"
		exit 1
	}
	if (ARGC>=3 && ARGV[2]=="-n") {
		NUMERIC=1
		for (i=3; i<ARGC; i++) ARGV[i-1]=ARGV[i]
		ARGC=ARGC-1
	}
}

FNR==1 {
	if ( ARGIND != 1 ) {
		process_data(NAME,VER,REL,SRC)
		NAME="" ; VER="" ; REL=""
		for (i in DEFS) delete DEFS[i]
		for (i in SRC) delete SRC[i]
	}
	FNAME=FILENAME
}

/^[Uu][Rr][Ll]:/&&(URL=="") { URL=subst_defines($2,DEFS) ; DEFS["url"]=URL }
/^[Nn]ame:/&&(NAME=="") { NAME=subst_defines($2,DEFS) ; DEFS["name"]=NAME }
/^[Vv]ersion:/&&(VER=="") { VER=subst_defines($2,DEFS) ; DEFS["version"]=VER }
/^[Rr]elease:/&&(REL=="") { REL=subst_defines($2,DEFS) ; DEFS["release"]=REL }
/^[Ss]ource[0-9]*:/ { if (/(ftp|http):\/\//) SRC[FNR]=subst_defines($2,DEFS) }
/%define/ { DEFS[$2]=subst_defines($3,DEFS) }

END {
	process_data(NAME,VER,REL,SRC)
}