Add follow_url_fallback config option (#172)

* Add follow_link_fallback config option
* Update README.md
* Rename follow_link_fallback to follow_url_fallback. Change logic of configuring

README.md

@@ -411,6 +411,9 @@ require('telekasten').setup({
     -- "telescope-media-files" if you have telescope-media-files.nvim installed
     -- "catimg-previewer" if you have catimg installed
     media_previewer = "telescope-media-files",
+
+    -- A customizable fallback handler for urls.
+    follow_url_fallback = nil,
 })
 END
 ```
@@ -475,6 +478,7 @@ END
 | `media_previewer` | how to preview media files | default: `telescope-media-files` |
 || - `telescope-media-files` if you have telescope-media-files.nvim installed |
 || - `catimg-previewer` if you have catimg installed |
+| `follow_url_fallback ` | A customizable fallback handler for urls. | default: `nil` |
 
 The calendar support has its own options, contained in `calendar_opts`:
 

doc/telekasten.txt

@@ -418,6 +418,13 @@ telekasten.setup({opts})
 
         Default: `telescope-media-files`
 
+                                    *telekasten.settings.follow_url_fallback*
+    follow_url_fallback:~
+        A customizable fallback handler for urls.
+        When it set to nil, Telekasten will use `xdg-open` or `open`
+
+        Default: `nil`
+        Example: `"call jobstart('firefox --new-window {{url}}')"`
                                                *telekasten.calendar_opts*
     -----------------------------------
     Valid keys for {opts.calendar_opts}

lua/telekasten.lua

@@ -156,6 +156,9 @@ local function defaultConfig(home)
         -- "catimg-previewer" if you have catimg installed
         -- "viu-previewer" if you have viu installed
         media_previewer = "telescope-media-files",
+
+        -- A customizable fallback handler for urls.
+        follow_url_fallback = nil,
     }
     M.Cfg = cfg
     M.note_type_templates = {
@@ -1473,6 +1476,11 @@ local function check_for_link_or_tag()
 end
 
 local function follow_url(url)
+    if M.Cfg.follow_url_fallback then
+        local cmd = string.gsub(M.Cfg.follow_url_fallback, "{{url}}", url)
+        return vim.cmd(cmd)
+    end
+
     -- we just leave it to the OS's handler to deal with what kind of URL it is
     local function format_command(cmd)
         return 'call jobstart(["'