From 48d6a7408f2371c5b66482cc68ec2b801d444700 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Fri, 18 Sep 2020 15:40:36 +0200
Subject: started work on latex render command

---
 include/SimpleHandlers.hpp |  2 ++
 src/SimpleHandlers.cpp     | 30 ++++++++++++++++++++++++++++++
 src/main.cpp               |  4 ++++
 3 files changed, 36 insertions(+)

diff --git a/include/SimpleHandlers.hpp b/include/SimpleHandlers.hpp
index aef2372..1121685 100644
--- a/include/SimpleHandlers.hpp
+++ b/include/SimpleHandlers.hpp
@@ -11,5 +11,7 @@ namespace Handler {
 
     json wikiHandler(std::string const &arguments, std::string const &session, void *payload);
 
+    json latexRenderHandler(std::string const &arguments, std::string const &session, void *payload);
+
     json klingerHandler(std::string const &arguments, std::string const &session, void *payload);
 }
\ No newline at end of file
diff --git a/src/SimpleHandlers.cpp b/src/SimpleHandlers.cpp
index ee801d4..0a4bdb1 100644
--- a/src/SimpleHandlers.cpp
+++ b/src/SimpleHandlers.cpp
@@ -2,7 +2,11 @@
 
 #include "Response.hpp"
 
+#include <cctype>
+#include <string>
 #include <fstream>
+#include <iomanip>
+#include <sstream>
 
 using namespace Response;
 
@@ -87,3 +91,29 @@ json Handler::sayHandler(const std::string &arguments, const std::string &sessio
     (void) payload;
     return simple_response(arguments, session, true);
 }
+
+std::string url_encode(std::string const &value) {
+    std::ostringstream escaped;
+    escaped.fill('0');
+    escaped << std::hex;
+
+    for (char c : value) {
+        // Keep alphanumeric and other accepted characters intact
+        if (isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~') {
+            escaped << c;
+            continue;
+        }
+
+        // Any other characters are percent-encoded
+        escaped << std::uppercase;
+        escaped << '%' << std::setw(2) << int((unsigned char) c);
+        escaped << std::nouppercase;
+    }
+
+    return escaped.str();
+}
+
+json Handler::latexRenderHandler(std::string const &arguments, std::string const &session, void *payload) {
+    (void) payload;
+    return simple_response("https://latex.codecogs.com/png.latex?" + url_encode(arguments), session, true);
+}
diff --git a/src/main.cpp b/src/main.cpp
index 948bc1d..2e215cd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -39,6 +39,10 @@ int main() {
                 return createPlainDescriptionFromText(
                         "{adlershof, nord, sued} Shows the daily menu of the mensa at various places.");
             }});
+    Handler::CommandHandler{"latex", Handler::latexRenderHandler [createPlainDescriptionFromText]() {
+                return createPlainDescriptionFromText(
+                        "Renders the given string to a png");
+            }});
     regular_commands.emplace_back(
             Handler::CommandHandler{"klinger", Handler::klingerHandler, [createPlainDescriptionFromText]() {
                 return createPlainDescriptionFromText("Greats in french. Bonjour!");
-- 
cgit v1.2.3-54-g00ecf