Merge pull request #137 from cloos/dependencies

Dependencies
Thanks @cloos 

This solution is nicer than the way I try to do it :)

mysqltuner.pl

@@ -36,14 +36,20 @@
 # http://forge.mysql.com/projects/view.php?id=44
 #
 package main;
+
+use 5.005;
 use strict;
 use warnings;
+
 use diagnostics;
 use File::Spec;
 use Getopt::Long;
 use File::Basename;
 use Cwd 'abs_path';
 
+use Data::Dumper;
+$Data::Dumper::Pair = " : ";
+
 # Set up a few variables for use in the script
 my $tunerversion = "1.6.1";
 my ( @adjvars, @generalrec );
@@ -365,23 +371,23 @@ sub validate_tuner_version {
   chomp($httpcli);
   if ( 1 != 1 and defined($httpcli) and -e "$httpcli" ) {
     debugprint "$httpcli is available.";
-    
+
     debugprint "$httpcli --connect-timeout 5 -silent '$url' 2>/dev/null | grep 'my \$tunerversion'| cut -d\\\" -f2";
     $update = `$httpcli --connect-timeout 5 -silent '$url' 2>/dev/null | grep 'my \$tunerversion'| cut -d\\\" -f2`;
     chomp($update);
     debugprint "VERSION: $update";
-    
+
-    
+
     compare_tuner_version($update);
     return;
   }
 
-  
+
   $httpcli=`which wget`;
   chomp($httpcli);
   if ( defined($httpcli) and -e "$httpcli" ) {
     debugprint "$httpcli is available.";
-    
+
     debugprint "$httpcli -e timestamping=off -T 5 -O - '$url' 2>$devnull| grep 'my \$tunerversion'| cut -d\\\" -f2";
     $update = `$httpcli -e timestamping=off -T 5 -O - '$url' 2>$devnull| grep 'my \$tunerversion'| cut -d\\\" -f2`;
     chomp($update);
@@ -639,19 +645,6 @@ sub mysql_setup {
     }
 }
 
-sub try_load {
-  my $mod = shift;
-
-  eval("use $mod");
-
-  if ($@) {
-    #print "\$@ = $@\n";
-    return(0);
-  } else {
-    return(1);
-  }
-}
-
 # MySQL Request Array
 sub select_array {
     my $req = shift;
@@ -1132,7 +1125,7 @@ sub check_storage_engines {
             chomp($db);
             if (   $db eq "information_schema"
                 or $db eq "performance_schema"
-                or $db eq "mysql" 
+                or $db eq "mysql"
                 or $db eq "lost+found" )
             {
                 next;
@@ -1687,7 +1680,7 @@ sub mysql_stats {
 
         if ( defined $myvar{'query_cache_type'} ) {
             infoprint "Query Cache Buffers";
-            infoprint " +-- Query Cache: " 
+            infoprint " +-- Query Cache: "
               . $myvar{'query_cache_type'} . " - "
               . (
                 $myvar{'query_cache_type'} eq 0 |
@@ -2161,7 +2154,7 @@ sub mysql_myisam {
           . " used / "
           . hr_num( $myvar{'key_buffer_size'} )
           . " cache)";
-    } 
+    }
 
     # Key buffer
     if ( !defined( $mycalc{'total_myisam_indexes'} ) and $doremote == 1 ) {
@@ -2639,7 +2632,7 @@ FROM INFORMATION_SCHEMA.STATISTICS s
   ON s.TABLE_SCHEMA = t.TABLE_SCHEMA
   AND s.TABLE_NAME = t.TABLE_NAME
  INNER JOIN (
-  SELECT 
+  SELECT
      TABLE_SCHEMA
    , TABLE_NAME
    , INDEX_NAME
@@ -2688,12 +2681,12 @@ ENDSQL
         and $myvar{'performance_schema'} eq 'ON' );
 
     $selIdxReq = <<'ENDSQL';
-SELECT CONCAT(CONCAT(object_schema,'.'),object_name) AS 'table', index_name 
+SELECT CONCAT(CONCAT(object_schema,'.'),object_name) AS 'table', index_name
 FROM performance_schema.table_io_waits_summary_by_index_usage
 WHERE index_name IS NOT NULL
-AND count_star =0  
+AND count_star =0
-AND index_name <> 'PRIMARY' 
+AND index_name <> 'PRIMARY'
-AND object_schema != 'mysql' 
+AND object_schema != 'mysql'
 ORDER BY count_star, object_schema, object_name;
 ENDSQL
     @idxinfo = select_array($selIdxReq);
@@ -2792,34 +2785,26 @@ END_TEMPLATE
 }
 sub dump_result {
     if ($opt{'debug'}) {
-      
-      if (try_load('Data::Dumper')) {
-          badprint "Data::Dumper Module is needed.";
-          exit 1;
-      }
-
-      use Data::Dumper qw/Dumper/;
-      $Data::Dumper::Pair = " : ";
       debugprint Dumper( \%result );
     }
 
     debugprint "HTML REPORT: $opt{'reportfile'}";
+
     if ($opt{'reportfile'} ne 0 ) {
-      if (try_load('Text::Template')) {
+      eval "{ use Text::Template }";
+      if ($@) {
           badprint "Text::Template Module is needed.";
           exit 1;
       }
-      if (try_load('Data::Dumper')) {
+
-          badprint "Data::Dumper Module is needed.";
-          exit 1;
-      }
-      use Text::Template;
-      use Data::Dumper qw/Dumper/;
-      $Data::Dumper::Pair = " : ";
       my $vars= {'data' => Dumper( \%result ) };
 
-      my $template = Text::Template->new(TYPE => 'STRING', PREPEND => q{;}, SOURCE => $templateModel)
+      my $template;
-      or die "Couldn't construct template: $Text::Template::ERROR";
+      {
+        no warnings 'once';
+        $template = Text::Template->new(TYPE => 'STRING', PREPEND => q{;}, SOURCE => $templateModel)
+        or die "Couldn't construct template: $Text::Template::ERROR";
+      }
       open my $fh, q(>), $opt{'reportfile'}
       or die "Unable to open $opt{'reportfile'} in write mode. please check permissions for this file or directory";
       $template->fill_in(HASH =>$vars, OUTPUT=>$fh );
@@ -2893,7 +2878,7 @@ You must provide the remote server's total memory when connecting to other serve
  --forcemem <size>    Amount of RAM installed in megabytes
  --forceswap <size>   Amount of swap memory configured in megabytes
  --passwordfile <path>Path to a password file list(one password by line)
- 
+
 =head1 OUTPUT OPTIONS
  --silent             Don't output anything on screen
  --nogood             Remove OK responses