biawebdocumenttree.hpp

   1 #ifndef __BIAWEBDOCUMENTTREE__
   2 #define __BIAWEBDOCUMENTTREE__
   3 #include <memory>
   4 #include <list>
   5 #include <iostream>
   6 #include <filesystem>
   7 #include <sys/stat.h>
   8 #include "biawebdocument.hpp"
   9 #include "biawebstrings.hpp"
  10 #include "biawebutil.hpp"
  11 #include "biawebdoclist.hpp"
  12
  13 // class to implement a document tree - both with or without subtrees
  14 namespace biaweb {
  15     class DocumentTree {
  16       protected:
  17         // the pointer to the parent tree if there is one or nullptr
  18         DocumentTree* parent;
  19         // child trees
  20         std::list<DocumentTree> children;
  21         // title of this tree
  22         std::string title;
  23         // summary for this tree - this is displayed in the index.html file of
  24         // this tree before the list of articles in the tree
  25         std::string summary;
  26         // file stub of this tree
  27         std::string stub;
  28         // list of documents in this tree
  29         std::list<Document> docs;
  30         // set the parent - protected function as this has to be
  31         // called only by add_child
  32         void set_parent (DocumentTree *parent) {
  33             this->parent = parent;
  34         }
  35
  36       public:
  37         // method to build a document tree from a path
  38         void document_tree_builder (std::string srcpath);
  39
  40         // create new top level document tree
  41         DocumentTree (std::string title, std::string stub = "") {
  42             this->title = escape_html (title);
  43             // if stub is not empty set it
  44             if (stub != "")
  45                 this->stub = stub;
  46             // make the stub from the title
  47             else
  48                 this->stub = convert_title (title);
  49             this->parent = nullptr;
  50         }
  51
  52         // set the summary for this tree
  53         void set_summary (std::string summary) {
  54             this->summary = summary;
  55         }
  56
  57         // set the summary for this tree as markdown text
  58         void set_markdown_summary (std::string summary) {
  59             this->summary = convert_to_markdown (summary);
  60         }
  61
  62         std::string get_summary () {
  63             return this->summary;
  64         }
  65
  66         // sort the documents as per creation time from latest to oldest
  67         void sort_documents_creation_time () {
  68             this->docs.sort ([] (Document &a, Document &b)
  69                     {return (a.get_creation_date() > b.get_creation_date()); });
  70         }
  71
  72         // create the document index for this tree
  73         void create_tree_html (std::string templatedir, std::string destdir);
  74
  75         // set the title
  76         void set_title (std::string title) {
  77             this->title = escape_html (title);
  78             // if no stub is set
  79             if (this->stub == "")
  80                 this->stub = convert_title (title);
  81         }
  82
  83         void set_stub (std::string stub) {
  84             this->stub = stub;
  85         }
  86
  87         std::string get_title () {
  88             return this->title;
  89         }
  90
  91         std::string get_stub () {
  92             return this->stub;
  93         }
  94
  95         // get the child level of this tree
  96         unsigned int get_level ();
  97
  98         // get the stub hierarchy
  99         std::string stub_hierarchy ();
 100
 101         // add a child tree to this tree
 102         void add_child (DocumentTree *child) {
 103             child->set_parent (this);
 104             this->children.push_back (*child);
 105         }
 106
 107         // add a document to this tree
 108         void add_document (Document *doc) {
 109             this->docs.push_back (*doc);
 110         }
 111
 112         // print a visual representation of this tree with levels
 113         void visualize_tree ();
 114
 115         // get a pointer to the parent of this tree
 116         DocumentTree *get_parent () {
 117             return this->parent;
 118         }
 119     };
 120
 121     // get the tree level - 0 if top level
 122     unsigned int DocumentTree::get_level () {
 123             unsigned int lev = 0;
 124             DocumentTree *par = this->get_parent ();
 125             while (par != nullptr) {
 126                 lev ++;
 127                 par = par->get_parent ();
 128             }
 129             return lev;
 130     }
 131
 132     // get the stub hierarchy for this tree
 133     std::string DocumentTree::stub_hierarchy () {
 134             std::list<std::string> levels;
 135             DocumentTree *par = this->get_parent();
 136             while (par!= nullptr) {
 137                 levels.push_front (par->get_stub());
 138                 par = par->get_parent ();
 139             }
 140             std::string stub_str;
 141             for (std::string level : levels) {
 142                 // if stub is empty, don't append a /
 143                 if (level != "")
 144                     stub_str += level + "/";
 145             }
 146             return stub_str;
 147     }
 148
 149     // print the representation of this tree
 150     void DocumentTree::visualize_tree () {
 151             // print the tree level
 152             std::cout << std::setw(3) << std::left << this->get_level ();
 153             // indent as per the level
 154             for (unsigned int i = 0; i < this->get_level(); i ++)
 155                 std::cout <<  "+--";
 156             // print the title of this tree
 157             std::cout << this->title << std::endl;
 158             // recurse through the child trees if any and so on
 159             for (DocumentTree child : children)
 160                 child.visualize_tree ();
 161     }
 162
 163     // create the tree - the index file for this tree and all the documents and
 164     // the child trees recursively - using the template specified
 165     void DocumentTree::create_tree_html (std::string templatedir, std::string destdir) {
 166         // create a document to represent the index of the tree.
 167         std::unique_ptr<Document> index (new Document (this->title));
 168         index.get()->set_index ();
 169         // set the file name path
 170         std::string filepath = destdir + "/" + this->stub_hierarchy () + this->stub;
 171         // set the url path - this should not have destdir as it is not part
 172         // of the site tree
 173         std::string urlpath = this->stub_hierarchy () + this->stub;
 174         // if urlpath is not empty then append a / to the end of the URL. This
 175         // is so that the base URL is not absolute
 176         if (urlpath != "")
 177             urlpath += "/";
 178
 179         // create the sidebars
 180         // First sidebar
 181         // Create a link to the index page and
 182         // If this tree has a parent, create a sidebar link to the level up
 183         std::unique_ptr<SideBar> bar1 (new SideBar());
 184         SideBarItem item0;
 185         item0.set_sidebar_text (INDEX);
 186         item0.set_sidebar_url (urlpath + "index.html");
 187         bar1.get()->add_sidebar_item (item0);
 188         if (this->get_parent() != nullptr) {
 189             SideBarItem item1;
 190             item1.set_sidebar_text (GO_UP);
 191             item1.set_sidebar_url (this->stub_hierarchy() + "index.html");
 192             bar1.get()->add_sidebar_item (item1);
 193         }
 194         index.get()->add_side_bar (*bar1.get());
 195
 196         // create a sidebar for the child levels if there are children
 197         std::unique_ptr<SideBar> bar2 (new SideBar ());
 198         bar2.get()->set_title (SUB_CAT + this->title);
 199         for (DocumentTree tree : this->children) {
 200             // we use site relative URLs that rely on the base href tag
 201             // so for biaweb generated sites, the base href tag should be
 202             // used in the main template
 203             SideBarItem item (tree.get_title(), urlpath +
 204                                             tree.stub + "/" + "index.html");
 205             bar2.get()->add_sidebar_item (item);
 206         }
 207         index.get()->add_side_bar (*bar2.get());
 208
 209         // create the path and then the index file
 210         std::filesystem::create_directories (filepath);
 211
 212         // Create the list of documents in this tree with links
 213         std::unique_ptr<DocList> article_list (new DocList ());
 214         article_list.get()->set_title (this->title + ": " + ART_LIST);
 215         // sort the documents as per creation time and then add the document
 216         // links - newest documents should appear above older ones.
 217         sort_documents_creation_time ();
 218         for (Document doc : this->docs) {
 219             DocListItem item (doc.get_title(),
 220                             urlpath + doc.get_filename() + ".html",
 221                             doc.get_creation_date(), doc.get_modified_date ());
 222             article_list.get()->add_document_item (item);
 223             // output the document also, add the side bars
 224             doc.add_side_bar (*bar1.get());
 225             doc.add_side_bar (*bar2.get());
 226             doc.output_to_html (templatedir, filepath);
 227         }
 228         // index should contain the summary followed by the article list
 229         index.get()->set_content (this->summary + article_list.get()->to_html(templatedir));
 230
 231         // output the index file
 232         index.get()->output_to_html (templatedir, filepath);
 233
 234         // recursively create index for children
 235         for (DocumentTree tree : this->children)
 236             tree.create_tree_html (templatedir, destdir);
 237     }
 238
 239     // build a document tree from a filesystem path recursively
 240     void DocumentTree::document_tree_builder (std::string srcpath_str) {
 241         std::filesystem::path srcpath (srcpath_str);
 242         this->title = srcpath.stem().string ();
 243
 244         // Get the directories to this child and add them as sub document
 245         // trees
 246         try {
 247             for (auto fsitem : std::filesystem::directory_iterator (srcpath) )
 248             {
 249                 // if it is a directory then build the tree for that directory
 250                 if (fsitem.is_directory ()) {
 251                     std::shared_ptr <DocumentTree> doctree
 252                                     (new DocumentTree (fsitem.path().filename().string()));
 253
 254                     this->add_child (doctree.get());
 255                 }
 256                 // add the regular files as documents in the tree
 257                 else if (fsitem.is_regular_file ()) {
 258                     // if it is an index file (specially named as index
 259                     // or index.md or whatever) directly add
 260                     // the contents to the summary of the Doctree
 261                     if (fsitem.path().stem().string() == "index")
 262                     {
 263                         std::ifstream infile (fsitem.path());
 264                         std::string infilestr ( (std::istreambuf_iterator<char> (infile)),
 265                                                 (std::istreambuf_iterator<char> ()) );
 266                         this->set_markdown_summary (infilestr);
 267                     }
 268                     // else it is a non-index file-
 269                     // create a Document and add it to the tree
 270                     else {
 271                         std::ifstream infile (fsitem.path ());
 272                         std::shared_ptr<Document> doc
 273                                 (new Document (infile));
 274                         infile.close ();
 275
 276                         // file modified date from system
 277                         struct stat buf;
 278                         if (stat (fsitem.path().string().c_str(), &buf) == 0)
 279                             doc.get()->set_modified_date (buf.st_mtim.tv_sec);
 280
 281                         this->add_document (doc.get());
 282                     }
 283                 }
 284             }
 285         }
 286         catch (std::filesystem::filesystem_error) {
 287             std::cout << "No such path! Specify an existing file path" << std::endl;
 288         }
 289
 290         // add the trees for the children recursively
 291         for (DocumentTree &child : this->children)
 292             child.document_tree_builder (srcpath_str + "/" + child.title);
 293     }
 294 }
 295
 296 #endif