Option parsing is hereby implemented.

remwharead.1.adoc

@@ -2,10 +2,9 @@
 :doctype:       manpage
 :Author:        tastytea
 :Email:         tastytea@tastytea.de
-:Date:          2019-05-11
+:Date:          2019-05-12
 :Revision:      0.0.0
 :man source:    remwharead
-:man version:   {revision}
 :man manual:    General Commands Manual
 
 == NAME
@@ -16,7 +15,7 @@ remwharead - Remember what you read, and when
 
 *remwharead* [*-t* _tags_] _URL_
 
-*remwhared* *-e* _format_ [*-f* _file_] [*-s* _start_,_end_]
+*remwharead* *-e* _format_ [*-f* _file_] [*-s* _start_,_end_]
 
 == DESCRIPTION
 
@@ -36,9 +35,13 @@ Save output to _file_. Default is stdout.
 
 *-s* _start_,_end_, *--span*=_start_,_end_::
 Only export entries between _start_ and _end_. _start_ and _end_ are date and
-time representations according to ISO 8601.
+time representations according to ISO 8601. Time zones are ignored at the
+moment.
 
-*--version*::
+*-h*, *--help*::
+Show help message.
+
+*-V*, *--version*::
 Print version, copyright and license.
 
 == EXAMPLES

src/main.cpp

@@ -14,7 +14,18 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-int main()
+#include <iostream>
+#include <string>
+#include "parse_options.hpp"
+
+using std::cout;
+using std::cerr;
+using std::endl;
+using std::string;
+
+int main(int argc, char *argv[])
 {
+    options opts = parse_options(argc, argv);
+
     return 0;
 }

src/parse_options.cpp

@@ -0,0 +1,143 @@
+/*  This file is part of remwharead.
+ *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <iostream>
+#include <exception>
+#include <ctime>
+#include <iomanip>
+#include <sstream>
+#include <popl.hpp>
+#include "version.hpp"
+#include "parse_options.hpp"
+
+using std::cout;
+using std::cerr;
+using std::endl;
+using std::exit;
+
+const system_clock::time_point string_to_timepoint(const string &strtime)
+{
+    std::stringstream sstime(strtime);
+    struct std::tm tm = {};
+    tm.tm_isdst = -1;           // Detect daylight saving time.
+    sstime >> std::get_time(&tm, "%Y-%m-%dT%T");
+    std::time_t time = timelocal(&tm); // Assume time is local.
+    return system_clock::from_time_t(time);
+}
+
+const options parse_options(int argc, char *argv[])
+{
+    string tags;
+    string format;
+    string file;
+    string span;
+    options opts;
+
+    try
+    {
+        popl::OptionParser op("Available options");
+        op.add<popl::Value<string>>
+            ("t", "tags", "Add tags to URL, delimited by commas.", "", &tags);
+        op.add<popl::Value<string>>
+            ("e", "export", "Export to format.", "", &format);
+        op.add<popl::Value<string>>
+            ("f", "file", "Save output to file.", "", &file);
+        op.add<popl::Value<string>>
+            ("s", "span", "Only export entries between YYYY-MM-DD,YYYY-MM-DD.",
+             "", &span);
+        auto option_help = op.add<popl::Switch>
+            ("h", "help", "Show this help message.");
+        auto option_version = op.add<popl::Switch>
+            ("V", "version", "Print version, copyright and license.");
+        op.parse(argc, argv);
+
+        if (option_help->is_set())
+        {
+            cout << "Usage: " << argv[0] << " [-t tags] URL\n";
+            cout << op;
+            exit(0);
+        }
+
+        if (option_version->is_set())
+        {
+            cout << "remwharead " << global::version << endl <<
+    "Copyright (C) 2019 tastytea <tastytea@tastytea.de>\n"
+    "License GPLv3: GNU GPL version 3 "
+    "<https://www.gnu.org/licenses/gpl-3.0.html>.\n"
+    "This program comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
+    "and you are welcome to redistribute it under certain conditions.\n";
+            exit(0);
+        }
+
+        if (!tags.empty())
+        {
+            size_t pos_end = 0;
+            size_t pos_start = 0;
+            while (pos_end != std::string::npos)
+            {
+                pos_end = tags.find(',', pos_start);
+                opts.tags.push_back
+                    (tags.substr(pos_start, pos_end - pos_start));
+                pos_start = pos_end + 1;
+            }
+        }
+
+        if (!format.empty())
+        {
+            if (format == "csv")
+            {
+                opts.format = export_format::csv;
+            }
+            else if (format == "asciidoc")
+            {
+                opts.format = export_format::asciidoc;
+            }
+            else
+            {
+                cerr << "Error: Export format must be csv or asciidoc.\n";
+                exit(1);
+            }
+        }
+
+        opts.file = file;
+
+        if (!span.empty())
+        {
+            size_t pos = span.find(',');
+            if (pos != std::string::npos)
+            {
+                opts.span =
+                    {
+                        string_to_timepoint(span.substr(0, pos)),
+                        string_to_timepoint(span.substr(pos + 1))
+                    };
+            }
+            else
+            {
+                cerr << "Error: Time span must be in format: "
+                    "YYYY-MM-DD,YYYY-MM-DD\n";
+                exit(1);
+            }
+        }
+    }
+    catch (const std::exception &e)
+    {
+        cerr << "Error: " << e.what() << endl;
+        exit(1);
+    }
+
+    return opts;
+}

src/parse_options.hpp

@@ -0,0 +1,52 @@
+/*  This file is part of remwharead.
+ *  Copyright © 2019 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef REMWHAREAD_PARSE_OPTIONS_HPP
+#define REMWHAREAD_PARSE_OPTIONS_HPP
+
+#include <string>
+#include <vector>
+#include <array>
+#include <chrono>
+#include <cstdlib>
+
+using std::string;
+using std::vector;
+using std::array;
+using std::chrono::system_clock;
+using std::uint8_t;
+
+enum class export_format
+{
+    csv,
+    asciidoc
+};
+
+typedef struct options
+{
+    vector<string> tags;
+    export_format format = {};
+    string file;
+    array<system_clock::time_point, 2> span;
+} options;
+
+// Convert ISO 8601 time-string to time_point.
+const system_clock::time_point string_to_timepoint(const string &strtime);
+
+// Parse command-line options.
+const options parse_options(int argc, char *argv[]);
+
+#endif  // REMWHAREAD_PARSE_OPTIONS_HPP