From c9327f2af541e4a17a6e2e05682122f8c8455d29 Mon Sep 17 00:00:00 2001
From: Steven Arcangeli <stevearc@stevearc.com>
Date: Tue, 29 Aug 2023 19:08:37 -0700
Subject: feat: display last few lines of the log file in :ConformInfo

---
 lua/conform/health.lua | 18 +++++++++++++++++-
 lua/conform/runner.lua | 16 +++++++++-------
 2 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/lua/conform/health.lua b/lua/conform/health.lua
index f285011..195a331 100644
--- a/lua/conform/health.lua
+++ b/lua/conform/health.lua
@@ -43,7 +43,21 @@ M.show_window = function()
   local lines = {}
   local highlights = {}
   local log = require("conform.log")
-  table.insert(lines, string.format("Log file: %s", log.get_logfile()))
+  local logfile = log.get_logfile()
+  table.insert(lines, string.format("Log file: %s", logfile))
+  table.insert(highlights, { "Title", #lines, 0, 10 })
+  if vim.fn.filereadable(logfile) == 1 then
+    local f = io.open(logfile, "r")
+    if f then
+      f:seek("end", -1024)
+      local text = f:read("*a")
+      f:close()
+      local log_lines = vim.split(text, "\n", { plain = true, trimempty = true })
+      for i = 2, #log_lines do
+        table.insert(lines, string.rep(" ", 10) .. log_lines[i])
+      end
+    end
+  end
   table.insert(lines, "")
 
   ---@param formatters conform.FormatterInfo[]
@@ -69,6 +83,7 @@ M.show_window = function()
   end
 
   table.insert(lines, "Formatters for this buffer:")
+  table.insert(highlights, { "Title", #lines, 0, -1 })
   local seen = {}
   local buf_formatters = conform.list_formatters_for_buffer()
   for _, formatter in ipairs(buf_formatters) do
@@ -78,6 +93,7 @@ M.show_window = function()
 
   table.insert(lines, "")
   table.insert(lines, "Other formatters:")
+  table.insert(highlights, { "Title", #lines, 0, -1 })
   local all_formatters = vim.tbl_filter(function(f)
     return not seen[f.name]
   end, conform.list_all_formatters())
diff --git a/lua/conform/runner.lua b/lua/conform/runner.lua
index d546a41..8c2bfaf 100644
--- a/lua/conform/runner.lua
+++ b/lua/conform/runner.lua
@@ -160,14 +160,16 @@ local function run_formatter(bufnr, formatter, config, ctx, input_lines, callbac
         log.debug("%s exited with code %d", formatter.name, code)
         callback(nil, output)
       else
-        log.error("%s exited with code %d", formatter.name, code)
-        log.warn("%s stdout: %s", formatter.name, stdout)
-        log.warn("%s stderr: %s", formatter.name, stderr)
-        local stderr_str
-        if stderr then
-          stderr_str = table.concat(stderr, "\n")
+        log.info("%s exited with code %d", formatter.name, code)
+        log.debug("%s stdout: %s", formatter.name, stdout)
+        log.debug("%s stderr: %s", formatter.name, stderr)
+        local err_str
+        if stderr and not vim.tbl_isempty(stderr) then
+          err_str = table.concat(stderr, "\n")
+        elseif stdout and not vim.tbl_isempty(stdout) then
+          err_str = table.concat(stdout, "\n")
         end
-        callback(string.format("Formatter '%s' error: %s", formatter.name, stderr_str))
+        callback(string.format("Formatter '%s' error: %s", formatter.name, err_str))
       end
     end,
   })
-- 
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