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unit dvHelpers;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, fpg_base;
const
OWN_HELP_MARKER = '[DOCVIEWHELP]';
function GetOwnHelpFileName: String;
// Given a filename, which may or may not contain a path or extension,
// finds the actual file. This can involve searching
// the help and bookshelf paths.
function FindHelpFile(const AFilename: TfpgString): TfpgString;
function SearchHelpPaths( const Filename: TfpgString; var ResultFilename: TfpgString; const IncludeAppDir: boolean ): boolean;
function GetApplicationDir: TfpgString;
function SearchPath( PathEnvVar: TfpgString; Filename: TfpgString; var FilenameFound: string ): boolean;
implementation
uses
fpg_utils
,dvConstants
,nvUtilities
;
function GetOwnHelpFileName: String;
begin
{ TODO -oGraeme -cown help : Maybe later we will have different language versions }
result := fpgExtractFilePath(ParamStr(0)) + cDocViewHelpFile;
if not fpgFileExists(Result) then
begin
Result := FindHelpFile(cDocViewHelpFile);
end;
end;
// Given a "filename" which may include a path, find it in various paths and extensions
function FindHelpFile(const AFilename: TfpgString): TfpgString;
var
AlternativeFileName: TfpgString;
lFilename: TfpgString;
begin
lFilename := AFilename;
if lFileName = OWN_HELP_MARKER then
begin
Result := GetOwnHelpFileName;
exit;
end;
Result := '';
AlternativeFileName := '';
if fpgExtractFileExt( lFilename ) = '' then
begin
lFilename := fpgChangeFileExt(lFilename, '.inf');
AlternativeFileName := fpgChangeFileExt(lFilename, '.hlp');
end;
if fpgExtractFilePath( lFileName ) <> '' then
begin
// Path specified; just see if it exists
// expand out relative paths
lFilename := fpgExpandFileName( lFileName );
AlternativeFilename := fpgExpandFileName( AlternativeFilename );
if fpgFileExists( lFilename ) then
Result := lFilename
else if fpgFileExists( AlternativeFilename ) then
Result := AlternativeFilename;
end
else
begin
// Path not specified; search current
if fpgFileExists( fpgExpandFileName( lFileName ) ) then
begin
Result := fpgExpandFileName( lFileName );
exit;
end;
if (AlternativeFilename <> '') and fpgFileExists(fpgExpandFileName(AlternativeFilename)) then
begin
Result := fpgExpandFileName( AlternativeFilename );
exit;
end;
// Search help paths
if not SearchHelpPaths( lFileName,
Result,
false // don't search our app dir
) then
begin
// Didn't find as specified or as .inf, try .hlp
if AlternativeFilename <> '' then
begin
if not SearchHelpPaths( AlternativeFileName,
Result,
false // don't search our app dir
) then
begin
Result := '';
end;
end;
end;
end;
// Result := AFileName;
end;
Function SearchHelpPaths( const Filename: TfpgString;
var ResultFilename: TfpgString;
const IncludeAppDir: boolean ): boolean;
begin
Result := SearchPath( HelpPathEnvironmentVar,
FileName,
ResultFilename );
if not Result then
Result := SearchPath( BookshelfEnvironmentVar,
FileName,
ResultFilename );
if ( not Result ) and IncludeAppDir then
begin
ResultFilename := fpgAppendPathDelim(GetApplicationDir)
+ Filename;
Result := fpgFileExists( ResultFilename );
if not Result then
ResultFilename := '';
end;
end;
function GetApplicationDir: TfpgString;
begin
Result := fpgExtractFilePath(ParamStr(0));
end;
function SearchPath( PathEnvVar: TfpgString; Filename: TfpgString; var FilenameFound: string ): boolean;
var
lFilename: string;
lDir: TfpgString;
fl: TStrings;
i: integer;
begin
Result := False;
FilenameFound := '';
lDir := GetEnvironmentVariable(PathEnvVar);
fl := TStringList.Create;
ListFilesInDirectory(lDir, AllFilesMask, True, fl);
TStringList(fl).Sort;
for i := 0 to fl.Count-1 do
begin
lFilename := fpgExtractFileName(fl[i]);
if SameText(lFilename, Filename) then
begin
FilenameFound := fl[i];
Result := True;
Exit;
end;
end;
end;
end.
|
