(* Creating photomontage of all pictures *)

(* Requires:
  montagepics - collection of pictures
  filemont - file for montage
  thsize = 50 or ...
  columns = 30 or ...
  ifRefreshMont = True - use to force refreshing
   Output:
  rows
   *)
maintainMontage := Module[{dirmontage, filemontage, filesdel, mf, d0, nf, sth, cline, nomontage},
rows = Ceiling[Length[montagepics]/columns]; 
(* Temporary directory for executing montage *.jpg *)
dirmontage = ToFileName[{dirtemp, "montage"}];
If[FileType[dirmontage] =!= Directory, CreateDirectory[dirmontage]];
filemontage = "montage.jpg"; 
If[FileType[dirmontage] =!= Directory, 
   Print["Fatal error: temporary directory for using montage - ", dirmontage, " was not found and cannot be created. Exiting ..."];
   Exit[];
   ];
SetDirectory[dirmontage];
filesdel = FileNames[{RegularExpression["\\d{6,6}[.]jpg"], "montage*.jpg"}];  
mf = Length[filesdel];
If[mf > 0,
  Print["maintainMontage: Deleting previously copied ", mf, " files: ", Short[filesdel, 2], " from temporary directory ", dirmontage];
  DeleteFile /@ filesdel;
  ];
checkfile /@ montagepics;
(* Deciding whether to update montage *)
If[FileType[filemont] === File && !ifRefreshMont === True,
d0 = AbsoluteTime[FileDate[filemont]];
If[And @@ ((AbsoluteTime[FileDate[#]] < d0)& /@ montagepics), Goto[nomontage]];
];
sth = ToString[thsize];
Print["Creating photomontage from ", Length[montagepics], " pictures: ", Short[montagepics, 2],
 ". Reduced thumbnails: " <> sth <>"x" <> sth <> "."(* <> " Size " <> width <> "x" <> height *)];
nf = 0;
Do[nf++;
  filecopy = ToString[PaddedForm[nf, 5, NumberPadding -> "0"]] <> ".jpg";
  CopyFile[fileorig, filecopy], {fileorig, montagepics}];
cline = "montage -quality 80 -background grey -bordercolor grey -geometry " <> 
   sth <> "x" <> sth <> "+1+1 -tile " <> ToString[columns] <> "x" <> ToString[rows] <> 
   " \"*.jpg\" "<> filemontage; 
(* Print[cline]; *)
(* Running command *)
Run[cline];
If[FileType[filemont] === File, 
   Print["Deleting previous montage file: ", filemont];
   DeleteFile[filemont];
   ];
CopyFile[filemontage, filemont];
Label[nomontage];
ResetDirectory[];
];