{*******************************************************}
{                                                       }
{       Methods of Sting                                }
{                                                       }
{       版权所有 (C) 2020 KngStr                        }
{                                                       }
{*******************************************************}

unit ksString;

interface

/// <summary>
/// 创建空白文件
/// </summary>
function CreateBlankFile(S: string): Boolean;
/// <summary>
/// 自动为已存在文件名加数字
/// </summary>
function AutoRenameFileName(AFile: string): string;
/// <summary>
/// 自动替换文件名中的非法字符为
/// </summary>
procedure ReplaceInvalidFileNameChars(var FileName: string; AChar: Char = '_');

/// <summary>
/// 格式化秒为时间，冒号分割
/// </summary>
function FormatSeconds(const AValue: Int64): string; overload;
/// <summary>
/// 格式化秒为时间，冒号分割
/// </summary>
function FormatSeconds(const AValue: Integer): string; overload;
/// <summary>
/// 格式化秒为时间，冒号分割
/// </summary>
function FormatSeconds(const AValue: Double): string; overload;

implementation

uses
  System.Classes, System.SysUtils, System.IOUtils;

function CreateBlankFile(S: string): Boolean;
var
  FStrm: TFileStream;
begin
  Result := False;
  try
    FStrm := TFileStream.Create(S, fmCreate);
    if FStrm = nil then
      Exit;
    Result := True;
    FreeAndNil(FStrm);
  except
    FStrm := nil;
  end;
end;

function AutoRenameFileName(AFile: string): string;
var
  I: Integer;
  sPath, sExt: string;
begin
  Result := AFile;
  I := 0;
  sPath := ChangeFileExt(Result, '');
  sExt := ExtractFileExt(Result);
  while FileExists(Result) do begin
    Inc(I);
    Result := Format('%s(%d)%s', [sPath, I, sExt]);
  end;
end;

procedure ReplaceInvalidFileNameChars(var FileName: string; AChar: Char);
var
  PFileName: PChar;
  FileNameLen: Integer;
  Ch: Char;
  I: Integer;
begin
  I := 0;
  PFileName := PChar(FileName);
  FileNameLen := Length(FileName);
  while I < FileNameLen do begin
    Ch := PFileName[I];

    if not TPath.IsValidFileNameChar(Ch) then
      PFileName[I] := AChar
    else
      Inc(I);
  end;
end;

function FormatSeconds(const AValue: Double): string; overload;
var
  h, m, s, ms: Integer;
begin
  ms := Trunc(Frac(AValue) * 1000);
  s := Trunc(AValue);
  m := s div 60;
  h := m div 60;
  if h > 0 then
    Result := Format('%.2d:%.2d:%.2d.%.3d', [h, m mod 60, s mod 60, ms])
  else
    Result := Format('%.2d:%.2d.%.3d', [m, s mod 60, ms]);
end;

function FormatSeconds(const AValue: Int64): string;
var
  h, m, s: Integer;
begin
  s := AValue;
  m := s div 60;
  h := m div 60;
  if h > 0 then
    Result := Format('%.2d:%.2d:%.2d', [h, m mod 60, s mod 60])
  else
    Result := Format('%.2d:%.2d', [m, s mod 60]);
end;

function FormatSeconds(const AValue: Integer): string; overload;
begin
  FormatSeconds(Int64(AValue));
end;

end.