Delphiッこ倶楽部東京出張所: Purgeもどき

仕事で使っているアプリケーションがExeName_YYYYMMDDHHNNSS.Logのような
ログファイルを一杯作るので、消してくれという依頼があった。

ただし、このフォルダには、上記のログを作るファイルがいくつかああって
3世代程度は残してくれという依頼があった。

昔、仕事で触ってたOpenVmsのファイルシステムにはバージョンというのが
あって、古いバージョンのファイルを消すPurgeコマンドがあり
これとにたようなものが欲しいなということで、とりあえず作ってみた。
(本家には似ても似つかぬ、あくまでももどきですが。）

使い方は、

PurgeMock "パージファイルマスク" /D:パージファイルがあるフォルダ /G:残す世代数

で、/R: を指定することで、パージファイルマスクに正規表現が使用できます。

また、ファイルの更新日時を基準に/G:で指定した数だけ残るよう古い日付のものを
削除しますが、 /T:を指定することでファイルの作成日時を基準にPurgeすることが
できます。

なお、パージファイルマスクにより、複数の異なるファイル名のファイルが削除対象
となりえますが、このツールでは、このような場合のことを想定しておりません。
（/G:で指定した数になるようにばっさり消します。）

以下、ソース(delphi Xeがあればコンパイル可能です。)を置いておきます。
ライセンスは、MITライセンスとします。
ソース使用は自由ですが、無保証とします。

まずはメイン。

view plain print ?

program PurgeMock;
{$APPTYPE CONSOLE}
uses
SysUtils,
PurgeMockImp in 'PurgeMockImp.pas',
MidasLib
;
function CreatePurgeMockParams : TPurgeMockParams;
var
PurgeMockParams : TPurgeMockParams;
i : Integer;
begin
PurgeMockParams := TPurgeMockParams.Create;
try
try
PurgeMockParams.Init(Paramstr(0));
for i := 1 to ParamCount -1 do
begin
PurgeMockParams.SetPurgeParam(Paramstr(i));
end;
except
PurgeMockParams.Free;
PurgeMockParams := nil;
end;
finally
Result := PurgeMockParams;
end;
end;
var
PurgeMockParams : TPurgeMockParams;
DoPurgeMock : TPuregMock;
Ret : Integer;
begin
try
{ TODO -oUser -cConsole メイン : ここにコードを記述してください }
PurgeMockParams := CreatePurgeMockParams;
if Assigned(PurgeMockParams) then
begin
DoPurgeMock := TPuregMock.Create(PurgeMockParams);
try
Ret := DoPurgeMock.Purge;
finally
DoPurgeMock.Free;
end;
PurgeMockParams.Free;
end;
except
on E: Exception do
Writeln(E.ClassName, ': ', E.Message);
end;
end.

program PurgeMock;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  PurgeMockImp in 'PurgeMockImp.pas',
  MidasLib
  ;

function CreatePurgeMockParams : TPurgeMockParams;
var
  PurgeMockParams : TPurgeMockParams;
 i : Integer;
begin

  PurgeMockParams := TPurgeMockParams.Create;
  try
    try
   PurgeMockParams.Init(Paramstr(0));
   for i := 1 to ParamCount -1 do
      begin
       PurgeMockParams.SetPurgeParam(Paramstr(i));
      end;
    except
      PurgeMockParams.Free;
      PurgeMockParams := nil;
    end;

  finally
    Result := PurgeMockParams;
  end;

end;

var
  PurgeMockParams : TPurgeMockParams;
  DoPurgeMock     : TPuregMock;
  Ret : Integer;

begin
  try
    { TODO -oUser -cConsole メイン : ここにコードを記述してください }
    PurgeMockParams := CreatePurgeMockParams;
    if Assigned(PurgeMockParams) then
    begin
      DoPurgeMock := TPuregMock.Create(PurgeMockParams);
      try
        Ret := DoPurgeMock.Purge;
      finally
        DoPurgeMock.Free;
      end;
      PurgeMockParams.Free;
    end;


  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
end.

次に、パージコマンドの本体

view plain print ?

unit PurgeMockImp;
interface
uses
SysUtils
,DB
,DBClient
;
type
TPurgeTimeStamp = (ptCreate, ptUpdate);
TPurgeMockParams = class
private
FTargetDir: String;
FUseRegularExpression: Boolean;
FFileMask: String;
FLeavingGenerations: Integer;
FPurgeTimeStamp: TPurgeTimeStamp;
procedure SetTargetDir(val: String);
procedure SetUseRegularExpression(val: Boolean);
procedure SetFileMask(val: String);
procedure SetLeavingGenerations(val: Integer);
procedure SetPurgeTimeStamp(val: TPurgeTimeStamp);
public
property TargetDir: String read FTargetDir write SetTargetDir;
property UseRegularExpression: Boolean read FUseRegularExpression
write SetUseRegularExpression;
property FileMask: String read FFileMask write SetFileMask;
property LeavingGenerations: Integer read FLeavingGenerations
write SetLeavingGenerations;
property PurgeTimeStamp: TPurgeTimeStamp read FPurgeTimeStamp
write SetPurgeTimeStamp;
procedure Init(ExePath: String);
procedure SetPurgeParam(PurgeParam : String);
end;
TPuregMock = class
public
constructor Create(Params: TPurgeMockParams);
function Purge: Integer;
destructor Destroy; override;
strict private
FPurgeMockParams: TPurgeMockParams;
FPurgeMockDataSet : TClientDataSet;
function MakePurgeFileList: Integer;
function ExecPurge: Integer;
function CreatePurgeDataSet : TClientDataSet;
end;
function TryParseCmdLineSw(ParameterString : String; Sw : Array of String; var ParamValue : String; IgnoreCase: Boolean = true) : boolean;
implementation
Uses
StrUtils
,IOUtils
,Types
,RegularExpressionsCore
;
procedure TPurgeMockParams.SetTargetDir(val: String);
begin
FTargetDir := val;
end;
procedure TPurgeMockParams.SetUseRegularExpression(val: Boolean);
begin
FUseRegularExpression := val;
end;
procedure TPurgeMockParams.Init(ExePath: String);
begin
FTargetDir := ExtractFileDir(ExePath);
FUseRegularExpression := false;
FileMask := '*.*';
FLeavingGenerations := 1;
FPurgeTimeStamp := ptUpdate;
end;
procedure TPurgeMockParams.SetFileMask(val: String);
begin
FFileMask := val
end;
procedure TPurgeMockParams.SetLeavingGenerations(val: Integer);
begin
if Val >= 0 then
begin
FLeavingGenerations := val;
end
else
begin
FLeavingGenerations := 0;
end;
end;
procedure TPurgeMockParams.SetPurgeParam(PurgeParam: String);
var
ValueStr : String;
begin
if TryParseCmdLineSw(PurgeParam,['/D:','-D:'],ValueStr) then
begin
FTargetDir := ValueStr;
Exit;
end;
if TryParseCmdLineSw(PurgeParam,['/U:','-U:'],ValueStr) then
begin
FUseRegularExpression := true;
Exit;
end;
if TryParseCmdLineSw(PurgeParam,['/G:','-G:'],ValueStr) then
begin
LeavingGenerations := StrToIntDef(ValueStr,1);
Exit;
end;
if TryParseCmdLineSw(PurgeParam,['/T:','-T:'],ValueStr) then
begin
FPurgeTimeStamp := ptCreate;
Exit;
end;
if TryParseCmdLineSw(PurgeParam,[],ValueStr) then
begin
FFileMask := ValueStr;
Exit;
end;
end;
procedure TPurgeMockParams.SetPurgeTimeStamp(val: TPurgeTimeStamp);
begin
FPurgeTimeStamp := val;
end;
constructor TPuregMock.Create(Params: TPurgeMockParams);
begin
inherited Create;
FPurgeMockParams := Params;
end;
function TPuregMock.Purge: Integer;
begin
Result := -1;
FPurgeMockDataSet := CreatePurgeDataSet;
if Assigned(FPurgeMockDataSet) then
begin
if MakePurgeFileList > 0 then
begin
Result := ExecPurge;
end;
FPurgeMockDataSet.EmptyDataSet;
FPurgeMockDataSet.Active := false;
FPurgeMockDataSet.Free;
end;
end;
function TPuregMock.CreatePurgeDataSet: TClientDataSet;
var
PurgeDataSet : TClientDataSet;
FD : TFieldDef;
begin
PurgeDataSet := TClientDataSet.Create(nil);
try
try
FD := PurgeDataSet.FieldDefs.AddFieldDef;
FD.Name := 'FileName';
FD.DataType := ftString;
FD.Size := 1024;
FD := PurgeDataSet.FieldDefs.AddFieldDef;
FD.Name := 'TimeStamp';
FD.DataType := ftDatetime;
PurgeDataSet.CreateDataSet;
PurgeDataSet.AddIndex('Purge_Idx','TimeStamp;FileName',[]);
PurgeDataSet.IndexName := 'Purge_Idx';
Except
if Assigned(PurgeDataSet) then PurgeDataSet.Free;
PurgeDataSet := nil;
end;
finally
Result := PurgeDataSet;
end;
end;
destructor TPuregMock.Destroy;
begin
if Assigned(FPurgeMockParams) then
begin
FPurgeMockParams := nil;
end;
inherited Destroy;
end;
function TPuregMock.MakePurgeFileList: Integer;
var
SearchOption: TSearchOption;
SearchDir : TDirectory;
SearchFileMask : String;
LList: TStringDynArray;
FileFullName,FileName : String;
CanAddList : Boolean;
PerlRegEx: TPerlRegEx;
PurgeFile : TFile;
begin
Result := 0;
//使っても使わなくても正規表現用のクラスをオープンしておく。
PerlRegEx:= TPerlRegEx.Create;
try
SearchOption := TSearchOption.soTopDirectoryOnly;
SearchFileMask := FPurgeMockParams.FileMask;
if FPurgeMockParams.UseRegularExpression then
begin
PerlRegEx.RegEx := SearchFileMask;
SearchFileMask := '*.*';
end;
try
LList := SearchDir.GetFiles(FPurgeMockParams.FTargetDir,SearchFileMask, SearchOption);
FPurgeMockDataSet.Active := true;
for FileFullName in LList do
begin
CanAddList := true;
if FPurgeMockParams.UseRegularExpression then
begin
FileName := ExtractFileName(FileFullName);
PerlRegEx.Subject := FileName;
CanAddList := PerlRegEx.Match;
end;
if CanAddList then
begin
//パージ対象リストに追加
FPurgeMockDataSet.Append;
FPurgeMockDataSet.FieldByName('FileName').AsString := FileFullName;
if FPurgeMockParams.FPurgeTimeStamp = ptCreate then
begin
FPurgeMockDataSet.FieldByName('TimeStamp').AsDateTime := PurgeFile.GetCreationTime(FileFullName);
end
else
begin
FPurgeMockDataSet.FieldByName('TimeStamp').AsDateTime := PurgeFile.GetLastAccessTime(FileFullName);
end;
FPurgeMockDataSet.Post;
end;
end;
Result := FPurgeMockDataSet.RecordCount;
except
Result := -1;
end;
finally
if Assigned(PerlRegEx) then PerlRegEx.Free;
end;
end;
function TPuregMock.ExecPurge: Integer;
var
DeleteCount : integer;
DeleteFileName : string;
PurgeFile : TFile;
begin
DeleteCount := 0;
try
FPurgeMockDataSet.Active := true;
FPurgeMockDataSet.First;
while not(FPurgeMockDataSet.Eof) do
begin
DeleteFileName := FPurgeMockDataSet.FieldByName('FileName').AsString;
PurgeFile.Delete(DeleteFileName);
inc(DeleteCount);
//レコードをDeleteした場合は、Next不要なので注意
FPurgeMockDataSet.Delete;
if FPurgeMockDataSet.RecordCount <= FPurgeMockParams.LeavingGenerations then Break;
end;
Result := DeleteCount;
Except
Result := -1;
end;
end;
function TryParseCmdLineSw(ParameterString : String;
Sw : Array of String;
var ParamValue : String;
IgnoreCase: Boolean) : boolean;
var
i : integer;
begin
Result := false;
if Length(Sw) = 0 then
begin
//SW指定がない場合はそのままの文字列を返す
ParamValue := ParameterString;
Result := true;
end
else
begin
for i := low(Sw) to high(Sw) do
begin
if IgnoreCase then
begin
if StartsText(Sw[i],ParameterString) then
begin
Result := true;
ParamValue := ReplaceText(ParameterString,Sw[i],'');
Break;
end;
end
else
begin
if StartsStr(Sw[i],ParameterString) then
begin
Result := true;
ParamValue := ReplaceStr(ParameterString,Sw[i],'');
Break;
end;
end;
end;
end;
end;
end.

unit PurgeMockImp;

interface

uses
  SysUtils
 ,DB
  ,DBClient
  ;

type
  TPurgeTimeStamp = (ptCreate, ptUpdate);

  TPurgeMockParams = class
  private
    FTargetDir: String;
    FUseRegularExpression: Boolean;
    FFileMask: String;
    FLeavingGenerations: Integer;
    FPurgeTimeStamp: TPurgeTimeStamp;
    procedure SetTargetDir(val: String);
    procedure SetUseRegularExpression(val: Boolean);
    procedure SetFileMask(val: String);
    procedure SetLeavingGenerations(val: Integer);
    procedure SetPurgeTimeStamp(val: TPurgeTimeStamp);
  public
    property TargetDir: String read FTargetDir write SetTargetDir;
    property UseRegularExpression: Boolean read FUseRegularExpression
      write SetUseRegularExpression;
    property FileMask: String read FFileMask write SetFileMask;
    property LeavingGenerations: Integer read FLeavingGenerations
      write SetLeavingGenerations;
    property PurgeTimeStamp: TPurgeTimeStamp read FPurgeTimeStamp
      write SetPurgeTimeStamp;
    procedure Init(ExePath: String);
  procedure SetPurgeParam(PurgeParam : String);
  end;

  TPuregMock = class
  public
    constructor Create(Params: TPurgeMockParams);
    function Purge: Integer;
    destructor Destroy; override;
  strict private
    FPurgeMockParams: TPurgeMockParams;
    FPurgeMockDataSet : TClientDataSet;
    function MakePurgeFileList: Integer;
    function ExecPurge: Integer;
    function CreatePurgeDataSet : TClientDataSet;
  end;

  function TryParseCmdLineSw(ParameterString : String; Sw : Array of String; var ParamValue : String; IgnoreCase: Boolean = true) : boolean;

implementation

Uses
   StrUtils
  ,IOUtils
  ,Types
  ,RegularExpressionsCore
  ;

procedure TPurgeMockParams.SetTargetDir(val: String);
begin
  FTargetDir := val;
end;

procedure TPurgeMockParams.SetUseRegularExpression(val: Boolean);
begin
  FUseRegularExpression := val;
end;

procedure TPurgeMockParams.Init(ExePath: String);
begin

 FTargetDir := ExtractFileDir(ExePath);
 FUseRegularExpression := false;
 FileMask := '*.*';
 FLeavingGenerations := 1;
 FPurgeTimeStamp := ptUpdate;

end;

procedure TPurgeMockParams.SetFileMask(val: String);
begin
  FFileMask := val
end;

procedure TPurgeMockParams.SetLeavingGenerations(val: Integer);
begin
 if Val >= 0 then
  begin
   FLeavingGenerations := val;
  end
  else
  begin
   FLeavingGenerations := 0;
  end;
end;

procedure TPurgeMockParams.SetPurgeParam(PurgeParam: String);
var
  ValueStr : String;
begin

 if TryParseCmdLineSw(PurgeParam,['/D:','-D:'],ValueStr) then
  begin
   FTargetDir := ValueStr;
    Exit;
  end;

 if TryParseCmdLineSw(PurgeParam,['/U:','-U:'],ValueStr) then
  begin
   FUseRegularExpression := true;
    Exit;
  end;

 if TryParseCmdLineSw(PurgeParam,['/G:','-G:'],ValueStr) then
  begin
   LeavingGenerations := StrToIntDef(ValueStr,1);
    Exit;
  end;

 if TryParseCmdLineSw(PurgeParam,['/T:','-T:'],ValueStr) then
  begin
   FPurgeTimeStamp := ptCreate;
    Exit;
  end;

 if TryParseCmdLineSw(PurgeParam,[],ValueStr) then
  begin
    FFileMask := ValueStr;
    Exit;
  end;

end;

procedure TPurgeMockParams.SetPurgeTimeStamp(val: TPurgeTimeStamp);
begin
  FPurgeTimeStamp := val;
end;

constructor TPuregMock.Create(Params: TPurgeMockParams);
begin
  inherited Create;
  FPurgeMockParams := Params;
end;

function TPuregMock.Purge: Integer;
begin

  Result := -1;

 FPurgeMockDataSet := CreatePurgeDataSet;
  if Assigned(FPurgeMockDataSet) then
  begin
    if MakePurgeFileList > 0 then
    begin
      Result := ExecPurge;
    end;
    FPurgeMockDataSet.EmptyDataSet;
    FPurgeMockDataSet.Active := false;
    FPurgeMockDataSet.Free;
  end;

end;

function TPuregMock.CreatePurgeDataSet: TClientDataSet;
var
 PurgeDataSet : TClientDataSet;
 FD : TFieldDef;
begin
 PurgeDataSet := TClientDataSet.Create(nil);
  try
    try
   FD := PurgeDataSet.FieldDefs.AddFieldDef;
      FD.Name := 'FileName';
      FD.DataType := ftString;
      FD.Size := 1024;

   FD := PurgeDataSet.FieldDefs.AddFieldDef;
      FD.Name := 'TimeStamp';
      FD.DataType := ftDatetime;

      PurgeDataSet.CreateDataSet;
      PurgeDataSet.AddIndex('Purge_Idx','TimeStamp;FileName',[]);
      PurgeDataSet.IndexName := 'Purge_Idx';

    Except
     if Assigned(PurgeDataSet) then PurgeDataSet.Free;
      PurgeDataSet := nil;
    end;
  finally
   Result := PurgeDataSet;
  end;
end;

destructor TPuregMock.Destroy;
begin
  if Assigned(FPurgeMockParams) then
  begin
    FPurgeMockParams := nil;
  end;

  inherited Destroy;
end;

function TPuregMock.MakePurgeFileList: Integer;
var
 SearchOption: TSearchOption;
 SearchDir : TDirectory;
  SearchFileMask : String;
  LList: TStringDynArray;
  FileFullName,FileName : String;
  CanAddList : Boolean;
  PerlRegEx: TPerlRegEx;
  PurgeFile : TFile;

begin

  Result := 0;

  //使っても使わなくても正規表現用のクラスをオープンしておく。
  PerlRegEx:= TPerlRegEx.Create;
  try
    SearchOption := TSearchOption.soTopDirectoryOnly;
    SearchFileMask := FPurgeMockParams.FileMask;


    if FPurgeMockParams.UseRegularExpression then
    begin
      PerlRegEx.RegEx := SearchFileMask;
      SearchFileMask := '*.*';
    end;

    try
      LList := SearchDir.GetFiles(FPurgeMockParams.FTargetDir,SearchFileMask, SearchOption);
      FPurgeMockDataSet.Active := true;
      for FileFullName in LList do
      begin
        CanAddList := true;
        if FPurgeMockParams.UseRegularExpression then
        begin
          FileName := ExtractFileName(FileFullName);
          PerlRegEx.Subject := FileName;
          CanAddList := PerlRegEx.Match;
        end;

        if CanAddList then
        begin
          //パージ対象リストに追加
          FPurgeMockDataSet.Append;
          FPurgeMockDataSet.FieldByName('FileName').AsString := FileFullName;
          if FPurgeMockParams.FPurgeTimeStamp = ptCreate then
          begin
           FPurgeMockDataSet.FieldByName('TimeStamp').AsDateTime := PurgeFile.GetCreationTime(FileFullName);
          end
          else
          begin
           FPurgeMockDataSet.FieldByName('TimeStamp').AsDateTime := PurgeFile.GetLastAccessTime(FileFullName);
          end;
          FPurgeMockDataSet.Post;
        end;
      end;
      Result := FPurgeMockDataSet.RecordCount;

    except
      Result := -1;
    end;
  finally
  if Assigned(PerlRegEx) then PerlRegEx.Free;

  end;
end;

function TPuregMock.ExecPurge: Integer;
var
 DeleteCount : integer;
  DeleteFileName : string;
  PurgeFile : TFile;
begin
  DeleteCount := 0;

  try
    FPurgeMockDataSet.Active := true;
    FPurgeMockDataSet.First;

    while not(FPurgeMockDataSet.Eof) do
    begin
      DeleteFileName := FPurgeMockDataSet.FieldByName('FileName').AsString;
      PurgeFile.Delete(DeleteFileName);
      inc(DeleteCount);

      //レコードをDeleteした場合は、Next不要なので注意
      FPurgeMockDataSet.Delete;
      if FPurgeMockDataSet.RecordCount <= FPurgeMockParams.LeavingGenerations then Break;
    end;
   Result := DeleteCount;

  Except
   Result := -1;
  end;
end;

function TryParseCmdLineSw(ParameterString : String;
                           Sw : Array of String;
                           var ParamValue : String;
                           IgnoreCase: Boolean) : boolean;
var
 i : integer;
begin

 Result := false;

  if Length(Sw) = 0 then
  begin
   //SW指定がない場合はそのままの文字列を返す
   ParamValue := ParameterString;
    Result := true;
  end
  else
  begin
   for i := low(Sw) to high(Sw) do
    begin
      if IgnoreCase then
      begin
        if StartsText(Sw[i],ParameterString) then
        begin
          Result := true;
          ParamValue := ReplaceText(ParameterString,Sw[i],'');
          Break;
        end;
      end
      else
      begin
        if StartsStr(Sw[i],ParameterString) then
        begin
          Result := true;
          ParamValue := ReplaceStr(ParameterString,Sw[i],'');
          Break;
        end;
      end;
    end;
  end;

end;

end.

Delphiッこ倶楽部東京出張所

2010年11月3日水曜日

Purgeもどき

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