feat: dont display binary output in answer

I was testing an API that returned a zip file and it was getting out of
hand so I added an is_binary_content_type to control whether to display
the content type.
Ideally I would have liked the display to be a default postprocess step so
that it gets more generic and let the user more control but this needs
deeper refactoring.

lua/rest-nvim/curl/init.lua

@@ -63,7 +63,7 @@ local function create_callback(method, url, script_str)
     -- get content type
     for _, header in ipairs(res.headers) do
       if string.lower(header):find("^content%-type") then
-        content_type = header:match("application/(%l+)") or header:match("text/(%l+)")
+        content_type = header:match("application/([-a-z]+)") or header:match("text/(%l+)")
         break
       end
     end
@@ -150,9 +150,15 @@ local function create_callback(method, url, script_str)
     end
 
     -- append response container
-    res.body = "#+RESPONSE\n" .. res.body .. "\n#+END"
+    local buf_content = "#+RESPONSE\n"
+    if utils.is_binary_content_type(content_type) then
+      buf_content = buf_content .. "Binary answer"
+    else
+      buf_content = buf_content .. res.body
+    end
+    buf_content = buf_content .. "\n#+END"
 
-    local lines = utils.split(res.body, "\n")
+    local lines = utils.split(buf_content, "\n")
     local line_count = vim.api.nvim_buf_line_count(res_bufnr) - 1
     vim.api.nvim_buf_set_lines(res_bufnr, line_count, line_count + #lines, false, lines)
 

lua/rest-nvim/request/init.lua

@@ -21,7 +21,7 @@ local function get_importfile_name(bufnr, start_line, stop_line)
     local fileimport_spliced
     fileimport_line = vim.api.nvim_buf_get_lines(bufnr, import_line - 1, import_line, false)
     fileimport_string =
-    string.gsub(fileimport_line[1], "<", "", 1):gsub("^%s+", ""):gsub("%s+$", "")
+      string.gsub(fileimport_line[1], "<", "", 1):gsub("^%s+", ""):gsub("%s+$", "")
     fileimport_spliced = utils.replace_vars(fileimport_string)
     if path:new(fileimport_spliced):is_absolute() then
       return fileimport_spliced
@@ -89,7 +89,6 @@ local function get_body(bufnr, start_line, stop_line, has_json)
     end
   end
 
-
   return body
 end
 

lua/rest-nvim/utils/init.lua

@@ -5,6 +5,14 @@ math.randomseed(os.time())
 
 local M = {}
 
+M.binary_content_types = {
+  "octet-stream",
+}
+
+M.is_binary_content_type = function(content_type)
+  return vim.tbl_contains(M.binary_content_types, content_type)
+end
+
 -- move_cursor moves the cursor to the desired position in the provided buffer
 -- @param bufnr Buffer number, a.k.a id
 -- @param line the desired line