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-rw-r--r--kalyptus/kdocUtil.pm189
1 files changed, 189 insertions, 0 deletions
diff --git a/kalyptus/kdocUtil.pm b/kalyptus/kdocUtil.pm
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+
+package kdocUtil;
+
+use strict;
+
+
+=head1 kdocUtil
+
+ General utilities.
+
+=head2 countReg
+
+ Parameters: string, regexp
+
+ Returns the number of times of regexp occurs in string.
+
+=cut
+
+sub countReg
+{
+ my( $str, $regexp ) = @_;
+ my( $count ) = 0;
+
+ while( $str =~ /$regexp/s ) {
+ $count++;
+
+ $str =~ s/$regexp//s;
+ }
+
+ return $count;
+}
+
+=head2 findCommonPrefix
+
+ Parameters: string, string
+
+ Returns the prefix common to both strings. An empty string
+ is returned if the strings have no common prefix.
+
+=cut
+
+sub findCommonPrefix
+{
+ my @s1 = split( "/", $_[0] );
+ my @s2 = split( "/", $_[1] );
+ my $accum = "";
+ my $len = ($#s2 > $#s1 ) ? $#s1 : $#s2;
+
+ for my $i ( 0..$len ) {
+# print "Compare: $i '$s1[$i]', '$s2[$i]'\n";
+ last if $s1[ $i ] ne $s2[ $i ];
+ $accum .= $s1[ $i ]."/";
+ }
+
+ return $accum;
+}
+
+=head2 makeRelativePath
+
+ Parameters: localpath, destpath
+
+ Returns a relative path to the destination from the local path,
+ after removal of any common prefix.
+
+=cut
+
+sub makeRelativePath
+{
+ my ( $from, $to ) = @_;
+
+ # remove prefix
+ $from .= '/' unless $from =~ m#/$#;
+ $to .= '/' unless $to =~ m#/$#;
+
+ my $pfx = findCommonPrefix( $from, $to );
+
+ if ( $pfx ne "" ) {
+ $from =~ s/^$pfx//g;
+ $to =~ s/^$pfx//g;
+ }
+# print "Prefix is '$pfx'\n";
+
+ $from =~ s#/+#/#g;
+ $to =~ s#/+#/#g;
+ $pfx = countReg( $from, '\/' );
+
+ my $rel = "../" x $pfx;
+ $rel .= $to;
+
+ return $rel;
+}
+
+sub hostName
+{
+ my $host = "";
+ my @hostenvs = qw( HOST HOSTNAME COMPUTERNAME );
+
+ # Host name
+ foreach my $evar ( @hostenvs ) {
+ next unless defined $ENV{ $evar };
+
+ $host = $ENV{ $evar };
+ last;
+ }
+
+ if( $host eq "" ) {
+ $host = `uname -n`;
+ chop $host;
+ }
+
+ return $host;
+}
+
+sub userName
+{
+ my $who = "";
+ my @userenvs = qw( USERNAME USER LOGNAME );
+
+ # User name
+ foreach my $evar ( @userenvs ) {
+ next unless defined $ENV{ $evar };
+
+ $who = $ENV{ $evar };
+ last;
+ }
+
+ if( $who eq "" ) {
+ if ( $who = `whoami` ) {
+ chop $who;
+ }
+ elsif ( $who - `who am i` ) {
+ $who = ( split (/ /, $who ) )[0];
+ }
+ }
+
+ return $who;
+}
+
+=head2 splitUnnested
+ Helper to split a list using a delimiter, but looking for
+ nesting with (), {}, [] and <>.
+ Example: splitting int a, QPair<c,b> d, e=","
+ on ',' will give 3 items in the list.
+
+ Parameter: delimiter, string
+ Returns: array, after splitting the string
+
+ Thanks to Ashley Winters
+=cut
+sub splitUnnested($$) {
+ my $delim = shift;
+ my $string = shift;
+ my(%open) = (
+ '[' => ']',
+ '(' => ')',
+ '<' => '>',
+ '{' => '}',
+ );
+ my(%close) = reverse %open;
+ my @ret;
+ my $depth = 0;
+ my $start = 0;
+ my $indoublequotes = 0;
+ while($string =~ /($delim|<<|>>|[][}{)(><\"])/g) {
+ my $c = $1;
+ if(!$depth and !$indoublequotes and $c eq $delim) {
+ my $len = pos($string) - $start - 1;
+ push @ret, substr($string, $start, $len);
+ $start = pos($string);
+ } elsif($open{$c}) {
+ $depth++;
+ } elsif($close{$c}) {
+ $depth--;
+ } elsif($c eq '"') {
+ if ($indoublequotes) {
+ $indoublequotes = 0;
+ } else {
+ $indoublequotes = 1;
+ }
+ }
+ }
+
+ my $subs = substr($string, $start);
+ push @ret, $subs if ($subs);
+ return @ret;
+}
+
+1;
+