MODULE DelOlder;


IMPORT Diagnostics;

IMPORT BigSets;
IMPORT Drectory;
IMPORT EnvironUtils;
IMPORT ErrorManager;
IMPORT HandleIO;
IMPORT KbdInput;
IMPORT M2Strings;
IMPORT PosUtils;
IMPORT StrConv;
IMPORT StrEdit;
IMPORT StringIO;


VAR
  exiting, BatchMode : BOOLEAN;
  PrimaryFileSpec, SecondaryFileSpec, PrimaryDirName, SecondaryDirName,
      PrimaryFileSpecPart, SecondaryFileSpecPart: ARRAY [0..79] OF CHAR;

  PrimaryDrive, SecondaryDrive: CHAR;


PROCEDURE Ask( question: ARRAY OF CHAR; VAR answer: ARRAY OF CHAR );
  VAR
    tmpstr: ARRAY [0..79] OF CHAR;
  BEGIN
    StringIO.WriteStr( StringIO.outp, question );
    IF answer[0] # 0C THEN
      (* There is a default. *)
      StringIO.WriteStr( StringIO.outp, ' <' );
      StringIO.WriteStr( StringIO.outp, answer );
      StringIO.WriteStr( StringIO.outp, '> ' );
    END;
    StringIO.ReadStr( StringIO.inp, tmpstr );
    IF tmpstr[0] = 0C THEN
      RETURN;
    END;
    IF (( CAP(tmpstr[0]) = 'Q' ) OR (tmpstr[0] = CHR(27)))
        AND (M2Strings.Length(tmpstr) = 1) THEN
      ErrorManager.StraightToDOS('');
    END;
    M2Strings.Assign( tmpstr, answer );
  END Ask;


  PROCEDURE FirstIsOlder( VAR First, Second: Drectory.FileInfoRec ): BOOLEAN;
    BEGIN
      IF First.year < Second.year THEN
        RETURN TRUE;
      ELSIF First.year > Second.year THEN
        RETURN FALSE;
      END;
      IF First.month < Second.month THEN
        RETURN TRUE;
      ELSIF First.month > Second.month THEN
        RETURN FALSE;
      END;
      IF First.day < Second.day THEN
        RETURN TRUE;
      ELSIF First.day > Second.day THEN
        RETURN FALSE;
      END;
      IF First.hour < Second.hour THEN
        RETURN TRUE;
      ELSIF First.hour > Second.hour THEN
        RETURN FALSE;
      END;
      IF First.minute < Second.minute THEN
        RETURN TRUE;
      ELSIF First.minute > Second.minute THEN
        RETURN FALSE;
      END;
      IF First.second < Second.second THEN
        RETURN TRUE;
      ELSE
        RETURN FALSE;
      END;
    END FirstIsOlder;


  PROCEDURE SameTimeStamp( VAR First, Second: Drectory.FileInfoRec ): BOOLEAN;
    BEGIN
      IF (First.year = Second.year) AND
      (First.month = Second.month) AND
      (First.day = Second.day) AND
      (First.hour = Second.hour) AND
      (First.minute = Second.minute) AND
      (First.second = Second.second) THEN
        RETURN TRUE;
      ELSE
        RETURN FALSE;
      END;
    END SameTimeStamp;


  PROCEDURE MakeInfoStr( FileInfo: Drectory.FileInfoRec; VAR TheStr: ARRAY
      OF CHAR );
    VAR
      dumstr: ARRAY [0..79] OF CHAR;
    BEGIN
      StrEdit.AssignStr( FileInfo.name, TheStr );
      WHILE M2Strings.Length(TheStr) < 12 DO
        StrEdit.Append( TheStr, ' ' );
      END;
      IF Drectory.SubdirectoryFile IN FileInfo.attribute THEN
        StrEdit.Append( TheStr, '   <DIR>' );
      ELSE
        StrConv.LongIntegerToStr( FileInfo.size, 8, dumstr );
        StrEdit.Append( TheStr, dumstr );
      END;
      StrConv.DateToStr( FileInfo.month, FileInfo.day, FileInfo.year,
          dumstr );
      StrEdit.Append( TheStr, '  ' );
      StrEdit.Append( TheStr, dumstr );
      StrConv.TimeToStr( FileInfo.hour, FileInfo.minute, FileInfo.second,
          FileInfo.second, dumstr );
      M2Strings.Delete( dumstr, M2Strings.Length(dumstr) - 7, 6 );
      StrEdit.Append( TheStr, '  ' );
      StrEdit.Append( TheStr, dumstr );
    END MakeInfoStr;

  PROCEDURE yes() : BOOLEAN;
    VAR
      choice : CARDINAL;
    BEGIN
      (*yes*)
      IF BatchMode THEN
        StringIO.WriteStr( StringIO.outp, 'yes');
        RETURN TRUE;
      END;
      choice := KbdInput.KeyHit( KbdInput.YorN );
      IF KbdInput.CAPkey(choice) = ORD('Y') THEN
        StringIO.WriteStr( StringIO.outp, 'yes');
        RETURN TRUE;
      ELSE
        StringIO.WriteStr( StringIO.outp, 'no');
        IF KbdInput.CAPkey(choice) = ORD('Q') THEN
          exiting := TRUE;
        END;
        RETURN FALSE;
      END;
    END yes;


PROCEDURE Processor1(info : Drectory.FileInfoRec) : BOOLEAN;
  VAR
    TmpPrimaryFile, TmpSecondaryFile, PrimaryInfoStr, SecondaryInfoStr:
        ARRAY [0..79] OF CHAR;
    DirHandle: CARDINAL;
    tmpinfo: Drectory.FileInfoRec;
  BEGIN
    IF PosUtils.Equal( '..', info.name ) OR
        PosUtils.Equal( '.', info.name ) THEN
      RETURN TRUE;
    END;

    M2Strings.Concat( PrimaryDirName, info.name, TmpPrimaryFile );
    M2Strings.Concat( SecondaryDirName, info.name, TmpSecondaryFile );

    M2Strings.Insert( ':', TmpPrimaryFile, 0 );
    M2Strings.Insert( PrimaryDrive, TmpPrimaryFile, 0 );
    M2Strings.Insert( ':', TmpSecondaryFile, 0 );
    M2Strings.Insert( SecondaryDrive, TmpSecondaryFile, 0 );

    IF HandleIO.FileExists( TmpSecondaryFile ) THEN
      MakeInfoStr( info, PrimaryInfoStr );
      DirHandle := 0FFFFH;
      StringIO.PrintMessage( Drectory.FindFirstFile( TmpSecondaryFile,
          DirHandle, tmpinfo ) );
      MakeInfoStr( tmpinfo, SecondaryInfoStr );
      IF ((M2Strings.CompareStr( PrimaryInfoStr, SecondaryInfoStr ) = 0) OR
          FirstIsOlder( tmpinfo, info ) OR SameTimeStamp( tmpinfo, info) ) AND
          (NOT PosUtils.Present('<DIR>', PrimaryInfoStr) ) THEN
        M2Strings.Insert( PrimaryDirName, PrimaryInfoStr, 0 );
        M2Strings.Insert( ':', PrimaryInfoStr, 0 );
        M2Strings.Insert( PrimaryDrive, PrimaryInfoStr, 0 );
        M2Strings.Insert( SecondaryDirName, SecondaryInfoStr, 0 );
        M2Strings.Insert( ':', SecondaryInfoStr, 0 );
        M2Strings.Insert( SecondaryDrive, SecondaryInfoStr, 0 );
        StrEdit.Append( SecondaryInfoStr, '  ' );
        StringIO.WriteEol( StringIO.outp, '' );
        StringIO.WriteStr( StringIO.outp, 'Keeping ' );
        StringIO.WriteEol( StringIO.outp, PrimaryInfoStr );
        StringIO.WriteStr( StringIO.outp, 'Delete? ' );
        StringIO.WriteStr( StringIO.outp, SecondaryInfoStr );
        IF yes() THEN
          StringIO.PrintMessage( Drectory.DeleteFile( TmpSecondaryFile ) );
        END;
        IF exiting THEN
          RETURN FALSE;
        END;
      END;
    END;
    RETURN TRUE;
  END Processor1;



BEGIN
  IF NOT EnvironUtils.ParsedParam( 1, PrimaryFileSpec ) THEN
    StringIO.WriteEol( StringIO.outp, '' );
    StringIO.WriteEol( StringIO.outp,
        'DelOlder expects two wildcard specifications of files in different' );
    StringIO.WriteEol( StringIO.outp,
        'directories.  It deletes all files in the second directory with ' );
    StringIO.WriteEol( StringIO.outp,
        'names that match those of files in the first directory if the ' );
    StringIO.WriteEol( StringIO.outp,
        'secondary files are identical to or older than the primary files.  A ' );
    StringIO.WriteEol( StringIO.outp,
        'trailing /p makes it pause for confirmation before deleting each file.' );
    StringIO.WriteEol( StringIO.outp, '' );
    PrimaryFileSpec := '';
    Ask( 'Primary file specification? (These files will survive.)  ',
        PrimaryFileSpec );
  END;
  IF NOT EnvironUtils.ParsedParam( 2, SecondaryFileSpec ) THEN
    SecondaryFileSpec := '';
    Ask( 'Secondary file specification? (These files may be deleted.)  ',
        SecondaryFileSpec );
  END;

  StrEdit.CrunchBlanks( PrimaryFileSpec );
  StrEdit.CrunchBlanks( SecondaryFileSpec );
  IF SecondaryFileSpec[M2Strings.Length(SecondaryFileSpec)-2]='/' THEN
    IF CAP( SecondaryFileSpec[M2Strings.Length(SecondaryFileSpec)-1] ) = 'P' THEN
      M2Strings.Delete(SecondaryFileSpec, M2Strings.Length(SecondaryFileSpec)-2, 2);
      StrEdit.CutTrailingChars( ' ', SecondaryFileSpec);
      BatchMode := FALSE;
    ELSE
      BatchMode := TRUE;
    END;
  ELSE
    BatchMode := TRUE;
  END;

  BigSets.AppendSet( KbdInput.YorN, "{'q', 'Q'}" );

  Drectory.GetDrivePathAndName( SecondaryFileSpec, SecondaryDrive,
      SecondaryDirName, SecondaryFileSpecPart );
  Drectory.GetDrivePathAndName( PrimaryFileSpec, PrimaryDrive,
      PrimaryDirName, PrimaryFileSpecPart );

  IF PosUtils.Equal( PrimaryFileSpecPart, '.' ) THEN
    StringIO.PrintMessage( Drectory.GetCurrentDir( Drectory.GetDefaultDrive(),
        PrimaryDirName ) );
  END;
  IF PosUtils.Equal( SecondaryFileSpecPart, '.' ) THEN
    StringIO.PrintMessage( Drectory.GetCurrentDir( Drectory.GetDefaultDrive(),
        SecondaryDirName ) );
  END;

  IF PrimaryFileSpecPart[0] = 0C THEN
    PrimaryFileSpecPart := '*.*';
  END;
  IF SecondaryFileSpecPart[0] = 0C THEN
    SecondaryFileSpecPart := '*.*';
  END;

  StrEdit.CutTrailingChars( '\', PrimaryDirName );
  StrEdit.CutTrailingChars( '\', SecondaryDirName );
  StrEdit.Append( PrimaryDirName, '\' );
  StrEdit.Append( SecondaryDirName, '\' );

  exiting := FALSE;

  StringIO.PrintMessage(Drectory.FindFiles( PrimaryFileSpec, Processor1 ));

END DelOlder.