From f146a6a7bcf0a70937be6c7715be43d7da4b838d Mon Sep 17 00:00:00 2001
From: Relintai <relintai@gmail.com>
Date: Mon, 28 Dec 2020 23:13:54 +0100
Subject: [PATCH] Added 2 pagination helpers to Utils.

---
 core/utils.cpp | 166 ++++++++++++++++++++++++++++++++++++++++++++++++-
 core/utils.h   |  16 +++--
 2 files changed, 173 insertions(+), 9 deletions(-)

diff --git a/core/utils.cpp b/core/utils.cpp
index dc7a953..25165fa 100644
--- a/core/utils.cpp
+++ b/core/utils.cpp
@@ -1,8 +1,10 @@
 #include "utils.h"
 
-#include <sstream>
-#include <memory>
+#include "html_builder.h"
 #include <maddy/parser.h>
+#include <memory>
+#include <sstream>
+#include <string>
 
 void Utils::newline_to_br(std::string *str) {
 	str_replace(str, "\r\n", "<br>");
@@ -11,7 +13,7 @@ void Utils::newline_to_br(std::string *str) {
 
 void Utils::markdown_to_html(std::string *str) {
 	std::shared_ptr<maddy::ParserConfig> config = std::make_shared<maddy::ParserConfig>();
-	config->isEmphasizedParserEnabled = true; 
+	config->isEmphasizedParserEnabled = true;
 	config->isHTMLWrappedInParagraph = true;
 
 	std::shared_ptr<maddy::Parser> parser = std::make_shared<maddy::Parser>(config);
@@ -23,6 +25,164 @@ void Utils::markdown_to_html(std::string *str) {
 	(*str) = htmlOutput;
 }
 
+std::string Utils::get_pagination(const std::string base_url, const uint32_t max, const uint32_t current_index, const uint32_t max_visible_links) {
+	std::string s = base_url;
+	if (s.size() > 0 && s[s.size() - 1] != '/') {
+		s += '/';
+	}
+
+	int starti = current_index - max_visible_links / 2;
+	int toi = current_index + max_visible_links / 2;
+
+	if (starti < 0) {
+		toi += -starti;
+		starti = 0;
+	}
+
+	if (toi > max) {
+		starti -= toi - max;
+		toi = max;
+
+		if (starti < 0) {
+			starti = 0;
+		}
+	}
+
+	//int toi = max > max_visible_links ? max_visible_links : max;
+
+	HTMLBuilder b;
+
+	b.ul()->cls("pagination");
+
+	if (max != 0 && current_index != 0) {
+		b.li();
+		b.a()->href(s + std::to_string(current_index - 1));
+		b.w("previous");
+		b.ca();
+		b.cli();
+	} else {
+		b.li()->cls("disabled");
+		b.w("previous");
+		b.cli();
+	}
+
+	if (starti != toi) {
+		for (uint32_t i = starti; i < toi; ++i) {
+			if (i != current_index) {
+				b.li();
+				b.a()->href(s + std::to_string(i + 1));
+				b.w(std::to_string(i + 1));
+				b.ca();
+				b.cli();
+			} else {
+				b.li()->cls("disabled");
+				b.w(std::to_string(i + 1));
+				b.cli();
+			}
+		}
+	} else {
+		b.li()->cls("disabled");
+		b.w(std::to_string(1));
+		b.cli();
+	}
+
+	if (max != 0 && current_index < max - 1) {
+		b.li();
+		b.a()->href(s + std::to_string(current_index + 2));
+		b.w("next");
+		b.ca();
+		b.cli();
+	} else {
+		b.li()->cls("disabled");
+		b.w("next");
+		b.cli();
+	}
+
+	b.cul();
+
+	return b.result;
+}
+
+std::string Utils::get_pagination_links(const std::string base_url, const std::vector<std::string> &links, const uint32_t current_index, const uint32_t max_visible_links) {
+	std::string s = base_url;
+	if (s.size() > 0 && s[s.size() - 1] != '/') {
+		s += '/';
+	}
+
+	uint32_t max = links.size();
+
+	int starti = current_index - max_visible_links / 2;
+	int toi = current_index + max_visible_links / 2;
+
+	if (starti < 0) {
+		toi += -starti;
+		starti = 0;
+	}
+
+	if (toi > max) {
+		starti -= toi - max;
+		toi = max;
+
+		if (starti < 0) {
+			starti = 0;
+		}
+	}
+
+	//int toi = max > max_visible_links ? max_visible_links : max;
+
+	HTMLBuilder b;
+
+	b.ul()->cls("pagination");
+
+	if (max != 0 && current_index != 0) {
+		b.li();
+		b.a()->href(s + links[current_index - 1]);
+		b.w("previous");
+		b.ca();
+		b.cli();
+	} else {
+		b.li()->cls("disabled");
+		b.w("previous");
+		b.cli();
+	}
+
+	if (starti != toi) {
+		for (uint32_t i = starti; i < toi; ++i) {
+			if (i != current_index) {
+				b.li();
+				b.a()->href(s + links[i]);
+				b.w(std::to_string(i + 1));
+				b.ca();
+				b.cli();
+			} else {
+				b.li()->cls("disabled");
+				b.w(std::to_string(i + 1));
+				b.cli();
+			}
+		}
+	} else {
+		b.li()->cls("disabled");
+		b.w(std::to_string(1));
+		b.cli();
+	}
+
+	if (max != 0 && current_index < max - 1) {
+		b.li();
+		b.a()->href(s + links[current_index + 1]);
+		b.w("next");
+		b.ca();
+		b.cli();
+	} else {
+		b.li()->cls("disabled");
+		b.w("next");
+		b.cli();
+	}
+
+	b.cul();
+
+	return b.result;
+}
+
 void Utils::str_replace(std::string *str, const std::string &from, const std::string &to) {
 	if (from.empty())
 		return;
diff --git a/core/utils.h b/core/utils.h
index bcba648..2971ec2 100644
--- a/core/utils.h
+++ b/core/utils.h
@@ -2,17 +2,21 @@
 #define UTILS_H
 
 #include <string>
+#include <vector>
 
 class Utils {
-    public:
-    static void newline_to_br(std::string *str);
-    //htmlspecialchars
+public:
+	static void newline_to_br(std::string *str);
+	//htmlspecialchars
 
-    static void markdown_to_html(std::string *str);
+	static void markdown_to_html(std::string *str);
+
+	static std::string get_pagination(const std::string base_url, const uint32_t max, const uint32_t current_index, const uint32_t max_visible_links = 10);
+	static std::string get_pagination_links(const std::string base_url, const std::vector<std::string> &links, const uint32_t current_index, const uint32_t max_visible_links = 10);
+
+	static void str_replace(std::string *str, const std::string &from, const std::string &to);
 
-    static void str_replace(std::string *str, const std::string& from, const std::string& to);
 protected:
 };
 
-
 #endif
\ No newline at end of file