src/generic/helpext.cpp

   1 /*-*- c++ -*-********************************************************
   2  * wxexthlp.cpp - an external help controller for wxWindows         *
   3  *                                                                  *
   4  * (C) 1998 by Karsten Ballüder (Ballueder@usa.net)                 *
   5  *                                                                  *
   6  * $Id$
   7  *******************************************************************/
   8 #ifdef __GNUG__
   9 #   pragma implementation "wxexthlp.h"
  10 #endif
  11
  12 #include   "wx/setup.h"
  13 #include   "wx/helpbase.h"
  14 #include   "wx/generic/helpext.h"
  15 #include   "wx/string.h"
  16 #include   "wx/utils.h"
  17 #include   "wx/list.h"
  18 #include   <stdio.h>
  19 #include   <ctype.h>
  20 #include   <sys/stat.h>
  21 #include   <unistd.h>
  22
  23
  24
  25 class wxExtHelpMapEntry : public wxObject
  26 {
  27 public:
  28    int      id;
  29    wxString url;
  30    wxString doc;
  31    wxExtHelpMapEntry(int iid, wxString const &iurl, wxString const &idoc)
  32       { id = iid; url = iurl; doc = idoc; }
  33 };
  34
  35
  36 struct wxBusyCursor
  37 {
  38    wxBusyCursor() { wxBeginBusyCursor(); }
  39    ~wxBusyCursor() { wxEndBusyCursor(); }
  40 };
  41
  42 IMPLEMENT_CLASS(wxExtHelpController, wxHelpControllerBase)
  43
  44 /**
  45    This class implements help via an external browser.
  46    It requires the name of a directory containing the documentation
  47    and a file mapping numerical Section numbers to relative URLS.
  48 */
  49
  50 wxExtHelpController::wxExtHelpController(void)
  51 {
  52    m_MapList = (wxList*) NULL;
  53    m_BrowserName = WXEXTHELP_DEFAULTBROWSER;
  54    m_BrowserIsNetscape = WXEXTHELP_DEFAULTBROWSER_IS_NETSCAPE;
  55    m_NumOfEntries = 0;
  56
  57    char *browser = getenv(WXEXTHELP_ENVVAR_BROWSER);
  58    if(browser)
  59    {
  60       m_BrowserName = browser;
  61       browser = getenv(WXEXTHELP_ENVVAR_BROWSERISNETSCAPE);
  62       m_BrowserIsNetscape = browser && (atoi(browser) != 0);
  63    }
  64 }
  65
  66 void
  67 wxExtHelpController::DeleteList(void)
  68 {
  69    if(m_MapList)
  70    {
  71       wxNode *node = m_MapList->First();
  72       while (node)
  73       {
  74          delete (wxExtHelpMapEntry *)node->Data();
  75          delete node;
  76          node = m_MapList->First();
  77       }
  78       delete m_MapList;
  79       m_MapList = (wxList*) NULL;
  80    }
  81 }
  82
  83 wxExtHelpController::~wxExtHelpController(void)
  84 {
  85    DeleteList();
  86 }
  87
  88 void
  89 wxExtHelpController::SetBrowser(wxString const & browsername, bool isNetscape)
  90 {
  91    m_BrowserName = browsername;
  92    m_BrowserIsNetscape = isNetscape;
  93 }
  94
  95 /** This must be called to tell the controller where to find the
  96     documentation.
  97     @param file - NOT a filename, but a directory name.
  98     @return true on success
  99 */
 100 bool
 101 wxExtHelpController::Initialize(const wxString& file)
 102 {
 103    return LoadFile(file);
 104 }
 105
 106
 107 bool
 108 wxExtHelpController::LoadFile(const wxString& ifile)
 109 {
 110    wxString mapFile, file, url, doc;
 111    int id,i,len;
 112    char buffer[WXEXTHELP_BUFLEN];
 113
 114    wxBusyCursor b; // display a busy cursor
 115
 116    if(! ifile.IsEmpty())
 117    {
 118       file = ifile;
 119       if(! wxIsAbsolutePath(file))
 120       {
 121          char* f = wxGetWorkingDirectory();
 122          file = f;
 123          delete[] f; // wxGetWorkingDirectory returns new memory
 124          file << WXEXTHELP_SEPARATOR << ifile;
 125       }
 126       else
 127          file = ifile;
 128
 129       if(! wxDirExists(file))
 130          return FALSE;
 131
 132       mapFile << file << WXEXTHELP_SEPARATOR << WXEXTHELP_MAPFILE;
 133    }
 134    else // try to reload old file
 135       mapFile = m_MapFile;
 136
 137    if(! wxFileExists(mapFile))
 138       return FALSE;
 139
 140    DeleteList();
 141    m_MapList = new wxList;
 142    m_NumOfEntries = 0;
 143
 144    FILE *input = fopen(mapFile.c_str(),"rt");
 145    if(! input)
 146       return FALSE;
 147    do
 148    {
 149       if(fgets(buffer,WXEXTHELP_BUFLEN,input) && *buffer != WXEXTHELP_COMMENTCHAR)
 150       {
 151          len = strlen(buffer);
 152          if(buffer[len-1] == '\n')
 153             buffer[len-1] = '\0'; // cut of trailing newline
 154          if(sscanf(buffer,"%d", &id) != 1)
 155             break; // error
 156          for(i=0; isdigit(buffer[i])||isspace(buffer[i])||buffer[i]=='-'; i++)
 157             ; // find begin of URL
 158          url = "";
 159          while(buffer[i] && ! isspace(buffer[i]) && buffer[i] !=
 160                WXEXTHELP_COMMENTCHAR)
 161             url << buffer[i++];
 162          while(buffer[i] && buffer[i] != WXEXTHELP_COMMENTCHAR)
 163             i++;
 164          doc = "";
 165          if(buffer[i])
 166             doc = (buffer + i + 1); // skip the comment character
 167          m_MapList->Append(new wxExtHelpMapEntry(id,url,doc));
 168          m_NumOfEntries++;
 169       }
 170    }while(! feof(input));
 171    fclose(input);
 172
 173    m_MapFile = file; // now it's valid
 174    return TRUE;
 175 }
 176
 177 bool
 178 wxExtHelpController::CallBrowser(wxString const &relativeURL)
 179 {
 180    wxBusyCursor b; // display a busy cursor
 181    wxString command;
 182
 183    if(m_BrowserIsNetscape) // try re-loading first
 184    {
 185       wxString lockfile;
 186       wxGetHomeDir(&lockfile);
 187       lockfile << WXEXTHELP_SEPARATOR << ".netscape/lock";
 188       struct stat statbuf;
 189       if(lstat(lockfile.c_str(), &statbuf) == 0)
 190       // cannot use wxFileExists, because it's a link pointing to a
 191       // non-existing location      if(wxFileExists(lockfile))
 192       {
 193          long success;
 194          command << m_BrowserName << " -remote openURL("
 195                  << "file://" << m_MapFile
 196                  << WXEXTHELP_SEPARATOR << relativeURL << ")";
 197          success = wxExecute(command);
 198          if(success != 0 ) // returns PID on success
 199             return TRUE;
 200       }
 201    }
 202    command = m_BrowserName;
 203    command << " file://"
 204            << m_MapFile << WXEXTHELP_SEPARATOR << relativeURL;
 205    return wxExecute(command) != 0;
 206 }
 207
 208 bool
 209 wxExtHelpController::DisplayContents(void)
 210 {
 211    if(! m_NumOfEntries)
 212       return FALSE;
 213    wxBusyCursor b; // display a busy cursor
 214    return KeywordSearch("");
 215 }
 216
 217 bool
 218 wxExtHelpController::DisplaySection(int sectionNo)
 219 {
 220    if(! m_NumOfEntries)
 221       return FALSE;
 222
 223    wxBusyCursor b; // display a busy cursor
 224    wxNode *node = m_MapList->First();
 225    wxExtHelpMapEntry *entry;
 226    while(node)
 227    {
 228       entry = (wxExtHelpMapEntry *)node->Data();
 229       if(entry->id == sectionNo)
 230          return CallBrowser(entry->url);
 231       node = node->Next();
 232    }
 233    return FALSE;
 234 }
 235
 236 bool
 237 wxExtHelpController::DisplayBlock(long blockNo)
 238 {
 239    return DisplaySection((int)blockNo);
 240 }
 241
 242 bool
 243 wxExtHelpController::KeywordSearch(const wxString& k)
 244 {
 245    if(! m_NumOfEntries)
 246       return FALSE;
 247
 248    wxBusyCursor b; // display a busy cursor
 249    wxString     *choices = new wxString[m_NumOfEntries];
 250    wxString     *urls = new wxString[m_NumOfEntries];
 251    wxString compA, compB;
 252
 253    int          idx = 0, j;
 254    bool         rc;
 255    bool         showAll = k.IsEmpty();
 256    wxNode       *node = m_MapList->First();
 257    wxExtHelpMapEntry *entry;
 258
 259    compA = k; compA.LowerCase(); // we compare case insensitive
 260    while(node)
 261    {
 262       entry = (wxExtHelpMapEntry *)node->Data();
 263       compB = entry->doc; compB.LowerCase();
 264       if((showAll || compB.Contains(k)) && ! compB.IsEmpty())
 265       {
 266          urls[idx] = entry->url;
 267          // doesn't work:
 268          // choices[idx] = (**i).doc.Contains((**i).doc.Before(WXEXTHELP_COMMENTCHAR));
 269          //if(choices[idx].IsEmpty()) // didn't contain the ';'
 270          //   choices[idx] = (**i).doc;
 271          choices[idx] = "";
 272          for(j=0;entry->doc.c_str()[j]
 273                 && entry->doc.c_str()[j] != WXEXTHELP_COMMENTCHAR; j++)
 274             choices[idx] << entry->doc.c_str()[j];
 275          idx++;
 276       }
 277       node = node->Next();
 278    }
 279
 280    if(idx == 1)
 281       rc = CallBrowser(urls[0]);
 282    else if(idx == 0)
 283    {
 284       wxMessageBox(_("No entries found."));
 285       rc = FALSE;
 286    }
 287    else
 288    {
 289       idx = wxGetSingleChoiceIndex(showAll ? _("Help Index") : _("Relevant entries:"),
 290                                    showAll ? _("Help Index") : _("Entries found"),
 291                                    idx,choices);
 292       if(idx != -1)
 293          rc = CallBrowser(urls[idx]);
 294       else
 295          rc = FALSE;
 296    }
 297    delete[] urls;
 298    delete[] choices;
 299
 300    return rc;
 301 }
 302
 303
 304 bool
 305 wxExtHelpController::Quit(void)
 306 {
 307    return TRUE;
 308 }
 309
 310 void
 311 wxExtHelpController::OnQuit(void)
 312 {
 313 }
 314