Fixing ghmarkdown adding the ability to use a GitHub token (#380)

* Fixing ghmarkdown adding the ability to use a GitHub token

* Updated the manifest.json file

3 files changed, 30 insertions, 5 deletions

diff --git a/README.md b/README.md
index 75d18b2..2b72b7e 100644
--- a/README.md
+++ b/README.md
@@ -89,7 +89,7 @@ but only with a `url` must provide a `checksum` that matches the existing plugin
 | [`fontconfig`](plugins/fontconfig.lua?raw=1)                                                            | Allows users to load fonts with [fontconfig](https://www.freedesktop.org/software/fontconfig/fontconfig-user.html).                                                                                                                                                                                                                                          |
 | [`force_syntax`](plugins/force_syntax.lua?raw=1)                                                        | Change the syntax used for a file.                                                                                                                                                                                                                                                                                                                           |
 | [`formatter`](https://github.com/vincens2005/lite-formatters)\*                                         | formatters for various languages                                                                                                                                                                                                                                                                                                                             |
-| [`ghmarkdown`](plugins/ghmarkdown.lua?raw=1)                                                            | Opens a preview of the current markdown file in a browser window *([screenshot](https://user-images.githubusercontent.com/3920290/82754898-f7394600-9dc7-11ea-8278-2305363ed372.png))* Note: the page content is generated by sending the markdown file to Github's markdown rendering [API](https://docs.github.com/en/rest/markdown?apiVersion=2022-11-28) |
+| [`ghmarkdown`](plugins/ghmarkdown.lua?raw=1)                                                            | Opens a preview of the current markdown file in a browser window *([screenshot](https://user-images.githubusercontent.com/3920290/82754898-f7394600-9dc7-11ea-8278-2305363ed372.png))* Note: the page content is generated by sending the markdown file to Github's markdown rendering [API](https://docs.github.com/en/rest/markdown?apiVersion=2022-11-28). Requires a [GitHub token](https://docs.github.com/en/rest/markdown/markdown?apiVersion=2022-11-28#render-a-markdown-document-in-raw-mode) being provided |
 | [`gitblame`](https://github.com/juliardi/lite-xl-gitblame)\*                                            | Shows "git blame" information of a line *([screenshot](https://raw.githubusercontent.com/juliardi/lite-xl-gitblame/main/screenshot_1.png))*                                                                                                                                                                                                                  |
 | [`gitdiff_highlight`](https://github.com/vincens2005/lite-xl-gitdiff-highlight)\*                       | highlight changed lines from git *([screenshot](https://raw.githubusercontent.com/vincens2005/lite-xl-gitdiff-highlight/master/screenshot.png))*                                                                                                                                                                                                             |
 | [`gitopen`](plugins/gitopen.lua?raw=1)                                                                  | Open project files that are in a git commit (default=HEAD)                                                                                                                                                                                                                                                                                                   |
diff --git a/manifest.json b/manifest.json
index cf8c9f5..f58c0ba 100644
--- a/manifest.json
+++ b/manifest.json
@@ -481,8 +481,8 @@
       "id": "formatter"
     },
     {
-      "description": "Opens a preview of the current markdown file in a browser window *([screenshot](https://user-images.githubusercontent.com/3920290/82754898-f7394600-9dc7-11ea-8278-2305363ed372.png))* Note: the page content is generated by sending the markdown file to Github's markdown rendering [API](https://docs.github.com/en/rest/markdown?apiVersion=2022-11-28)",
-      "version": "0.1",
+      "description": "Opens a preview of the current markdown file in a browser window *([screenshot](https://user-images.githubusercontent.com/3920290/82754898-f7394600-9dc7-11ea-8278-2305363ed372.png))* Note: the page content is generated by sending the markdown file to Github's markdown rendering [API](https://docs.github.com/en/rest/markdown?apiVersion=2022-11-28). Requires a [GitHub token](https://docs.github.com/en/rest/markdown/markdown?apiVersion=2022-11-28#render-a-markdown-document-in-raw-mode) being provided",
+      "version": "0.2",
       "path": "plugins/ghmarkdown.lua",
       "id": "ghmarkdown",
       "mod_version": "3"
diff --git a/plugins/ghmarkdown.lua b/plugins/ghmarkdown.lua
index c7fabdd..03ed08a 100644
--- a/plugins/ghmarkdown.lua
+++ b/plugins/ghmarkdown.lua
@@ -1,8 +1,25 @@
 -- mod-version:3
 local core = require "core"
 local command = require "core.command"
+local common = require "core.common"
+local config = require "core.config"
 local keymap = require "core.keymap"
 
+config.plugins.ghmarkdown = common.merge({
+  -- Find information on how to generate your own token at
+  -- https://docs.github.com/en/rest/markdown/markdown?apiVersion=2022-11-28#render-a-markdown-document-in-raw-mode
+  github_token = "",
+  config_spec = {
+    name = "GHMarkdown",
+    {
+      label = "GitHub token",
+      description = "Enter your personal GitHub token",
+      path = "github_token",
+      type = "string",
+      default = ""
+    }
+  }
+}, config.plugins.ghmarkdown)
 
 local html = [[
 <html>
@@ -31,7 +48,9 @@ local html = [[
     <script>
       var xhr = new XMLHttpRequest;
       xhr.open("POST", "https://api.github.com/markdown/raw");
-      xhr.setRequestHeader("Content-Type", "text/plain");
+      xhr.setRequestHeader("content-type", "text/plain");
+      xhr.setRequestHeader("authorization", "Bearer ${token}");
+      xhr.setRequestHeader("x-github-api-version", "2022-11-28");
       xhr.onload = function() { document.body.innerHTML = xhr.responseText; };
       xhr.send("${content}");
     </script>
@@ -42,11 +61,17 @@ local html = [[
 
 command.add("core.docview!", {
   ["ghmarkdown:show-preview"] = function(dv)
+    if config.plugins.ghmarkdown.github_token == "" then
+      core.error "You need to provide your own GitHub token"
+      return
+    end
+
     local content = dv.doc:get_text(1, 1, math.huge, math.huge)
     local esc = { ['"'] = '\\"', ["\n"] = '\\n' }
     local text = html:gsub("${(.-)}", {
       title = dv:get_name(),
-      content = content:gsub(".", esc)
+      content = content:gsub(".", esc),
+      token = config.plugins.ghmarkdown.github_token
     })
 
     local htmlfile = core.temp_filename(".html")