create modules

src/markdown/markdown.cpp

@@ -0,0 +1,96 @@
+#include "markdown.hpp"
+#include "utils.hpp"
+#include <ctime>
+#include <fstream>
+#include <iostream>
+#include <map>
+#include <md4c-html.h>
+#include <optional>
+#include <sstream>
+#include <toml++/toml.hpp>
+
+std::optional<Metadata> get_metadata(const std::string &FILE_PATH) {
+  std::fstream file(FILE_PATH);
+  std::stringstream metadata_s;
+  std::string buffer;
+
+  /* if there's no ---, then no metadata in file there is */
+  if (!getline(file, buffer) || buffer != "---") {
+    std::cerr << "File " << FILE_PATH << " does not contain metadata. "
+              << std::endl;
+    return std::nullopt;
+  }
+
+  std::map<std::string, std::string> metadata_map;
+
+  while (getline(file, buffer)) {
+    if (buffer == "---") {
+      break;
+    }
+    metadata_s << buffer << '\n';
+  }
+
+  toml::table toml_table = toml::parse(metadata_s);
+  std::vector<std::string> tags;
+  const auto &toml_tags = toml_table["metadata"]["tags"];
+
+  // translate toml into normal vector of strings
+  if (toml_tags.is_array()) {
+    for (auto iter = toml_tags.as_array()->begin();
+         iter < toml_tags.as_array()->end(); iter++) {
+      tags.emplace_back(static_cast<std::string>(iter->as_string()->get()));
+    }
+  }
+
+  // time
+  auto toml_time = toml_table["metadata"]["date"];
+
+  struct tm t = {};
+  time_t timestamp = time(NULL);
+
+  if (toml_time.is_date()) {
+    toml::date d = toml_time.as_date()->get();
+
+    t.tm_year = d.year - 1900;
+    t.tm_mon = d.month - 1;
+    t.tm_mday = d.day;
+    t.tm_isdst = 0;
+
+    timestamp = mktime(&t);
+  }
+
+  Metadata metadata = {toml_table["metadata"]["author"].value_or(""), timestamp,
+                       toml_table["metadata"]["title"].value_or(""), tags};
+
+  return std::optional(metadata);
+}
+
+static void html_callback(const MD_CHAR *data, MD_SIZE size, void *userdata) {
+  std::string *out = static_cast<std::string *>(userdata);
+  out->append(data, size);
+}
+
+std::string get_html(const std::string &FILE_PATH) {
+  std::fstream file(FILE_PATH);
+  std::string buffer, file_string, out;
+  getline(file, buffer);
+  bool is_metadata = buffer == "---";
+
+  /* skip metadata */
+  if (is_metadata) {
+    while (getline(file, buffer)) {
+      if (buffer == "---") {
+        break;
+      }
+    }
+  } else {
+    file_string += buffer + '\n';
+  }
+
+  while (getline(file, buffer)) {
+    file_string += buffer + '\n';
+  }
+
+  md_html(file_string.c_str(), file_string.size(), html_callback, &out, 0, 0);
+  return out;
+}

src/markdown/markdown.hpp

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+#include <ctime>
+#include <optional>
+#include <string>
+#include <toml++/toml.hpp>
+#include <vector>
+
+struct Metadata {
+  std::string author;
+  time_t date;
+  std::string title;
+  std::vector<std::string> tags;
+};
+
+// Reads the metadata of the markdown file
+// Metadata are in yaml format at the top of the file
+// They are separated from the rest of the file with `---` at the beginning and
+// at the end.
+//
+// Returns nullopt when no metadata is found in the file
+std::optional<Metadata> get_metadata(const std::string &FILE_PATH);
+
+// Reads the markdown file and converts it to html.
+// Return everything in one string
+std::string get_html(const std::string &FILE_PATH);