feat: initial statistics implementation

README.md

@@ -48,7 +48,7 @@ have to leave Neovim!
 
 - System-wide
   - curl
-- Optional [can be changed, see config bellow]
+- Optional [can be changed, see config below]
   - jq   (to format JSON output)
   - tidy (to format HTML output)
 - Other plugins
@@ -83,6 +83,9 @@ use {
         show_curl_command = false,
         show_http_info = true,
         show_headers = true,
+        -- table of curl `--write-out` variables or false if disabled
+        -- for more granular control see Statistics Spec
+        show_statistics = false,
         -- executables or functions for formatting response body [optional]
         -- set them to false if you want to disable them
         formatters = {
@@ -154,6 +157,16 @@ To run `rest.nvim` you should map the following commands:
 - `custom_dynamic_variables` allows to extend or overwrite built-in dynamic variable functions
     (default: {})
 
+### Statistics Spec
+
+| Property | Type            | Description                                            |
+| :------- | :-------------- | :----------------------------------------------------- |
+| [1]      | string          | `--write-out` variable name, see `man curl`. Required. |
+| title    | string          | Replaces the variable name in the output if defined.   |
+| type     | string|function | Specifies type transformation for the output value.
+Default transformers are `time` and `byte`. Can also be a function which takes the
+value as a parameter and returns a string. |
+
 ## Usage
 
 Create a new http file or open an existing one and place the cursor over the

lua/rest-nvim/config/init.lua

@@ -14,6 +14,7 @@ local config = {
     show_url = true,
     show_http_info = true,
     show_headers = true,
+    show_statistics = false,
     formatters = {
       json = "jq",
       html = function(body)

lua/rest-nvim/curl/init.lua

@@ -175,6 +175,15 @@ local function create_callback(curl_cmd, opts)
       end
     end
 
+    if config.get("result").show_statistics then
+      -- Statistics, e.g. Total Time: 123.4 ms
+      local statistics
+
+      res.body, statistics = utils.parse_statistics(res.body)
+
+      utils.write_block(res_bufnr, statistics, true)
+    end
+
     --- Add the curl command results into the created buffer
     local formatter = config.get("result").formatters[content_type]
     -- format response body

lua/rest-nvim/init.lua

@@ -158,6 +158,23 @@ rest.run_request = function(req, opts)
     spliced_body = splice_body(result.headers, result.body)
   end
 
+  if config.get("result").show_statistics then
+    local statistics_line = {}
+
+    for _, tbl in ipairs(config.get("result").show_statistics) do
+      if type(tbl) == "string" then
+        tbl = { tbl }
+      end
+
+      table.insert(statistics_line, tbl[1] .. "=%{" .. tbl[1] .. "}")
+    end
+
+    curl_raw_args = vim.tbl_extend("force", curl_raw_args, {
+      "--write-out",
+      "\\n" .. table.concat(statistics_line, "&"),
+    })
+  end
+
   Opts = {
     request_id = vim.loop.now(), -- request id used to correlate RestStartRequest and RestStopRequest events
     method = result.method:lower(),

lua/rest-nvim/utils/init.lua

@@ -508,6 +508,106 @@ M.split_list = function(tbl, index, inclusive)
   return out
 end
 
+--- Default transformers for statistics
+local transform = {
+  time = function(time)
+    time = tonumber(time)
+
+    if time >= 60 then
+      time = string.format("%.2f", time / 60)
+
+      return time .. " min"
+    end
+
+    local units = { "s", "ms", "µs", "ns" }
+    local unit = 1
+
+    while time < 1 and unit <= #units do
+      time = time * 1000
+      unit = unit + 1
+    end
+
+    time = string.format("%.2f", time)
+
+    return time .. " " .. units[unit]
+  end,
+
+  byte = function(bytes)
+    bytes = tonumber(bytes)
+
+    local units = { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB" }
+    local unit = 1
+
+    while bytes >= 1024 and unit <= #units do
+      bytes = bytes / 1024
+      unit = unit + 1
+    end
+
+    bytes = string.format("%.2f", bytes)
+
+    return bytes .. " " .. units[unit]
+  end,
+}
+
+--- Parse statistics line to a table with key, value pairs
+---
+--- @param statistics_line string The statistics line from body
+---
+--- @return string[] statistics
+local get_parsed_statistics = function(statistics_line)
+  local out = {}
+
+  for _, statistics_pair in ipairs(M.split(statistics_line, "&")) do
+    local value = M.split(statistics_pair, "=", 1)
+
+    if #value == 1 then
+      table.insert(out, value[1])
+    else
+      out[value[1]] = value[2]
+    end
+  end
+
+  return out
+end
+
+--- Parse and transform statistics line to a table of strings to be output.
+--- Returns the body without statistics line and a table of statistics lines.
+---
+--- @param body string Response body
+---
+--- @return string body, string[] statistics
+M.parse_statistics = function(body)
+  local _, _, statistics = string.find(body, "[%c%s]+([^%c]*)$")
+  local config_statistics = config.get("result").show_statistics
+
+  body = string.gsub(body, "[%c%s]+([^%c]*)$", "")
+  local out = {}
+
+  statistics = get_parsed_statistics(statistics)
+
+  for _, tbl in ipairs(config_statistics) do
+    if type(tbl) == "string" then
+      tbl = { tbl }
+    end
+
+    local value = statistics[tbl[1]]
+
+    if tbl.type then
+      if type(tbl.type) == "string" then
+        value = transform[tbl.type](value)
+      end
+
+      if type(tbl.type) == "function" then
+        value = tbl.type(value)
+      end
+    end
+
+    table.insert(out, (tbl.title or (tbl[1] .. " ")) .. value)
+  end
+
+  return body, out
+end
+
 -- http_status returns the status code and the meaning, e.g. 200 OK
 -- see https://httpstatuses.com/ for reference
 -- @param code The request status code