feat: ConformInfo command for debugging formatter status

2 files changed, 104 insertions, 14 deletions

diff --git a/lua/conform/health.lua b/lua/conform/health.lua
index 76309be..f285011 100644
--- a/lua/conform/health.lua
+++ b/lua/conform/health.lua
@@ -1,5 +1,21 @@
 local M = {}
 
+---@param name string
+---@return string[]
+local function get_formatter_filetypes(name)
+  local conform = require("conform")
+  local filetypes = {}
+  for filetype, formatters in pairs(conform.formatters_by_ft) do
+    if not vim.tbl_islist(formatters) then
+      formatters = formatters.formatters
+    end
+    if vim.tbl_contains(formatters, name) then
+      table.insert(filetypes, filetype)
+    end
+  end
+  return filetypes
+end
+
 M.check = function()
   local conform = require("conform")
   vim.health.report_start("conform.nvim report")
@@ -14,16 +30,7 @@ M.check = function()
         string.format("%s unavailable: %s", formatter.name, formatter.available_msg)
       )
     else
-      local filetypes = {}
-      for filetype, formatters in pairs(conform.formatters_by_ft) do
-        if not vim.tbl_islist(formatters) then
-          formatters = formatters.formatters
-        end
-        if vim.tbl_contains(formatters, formatter.name) then
-          table.insert(filetypes, filetype)
-        end
-      end
-
+      local filetypes = get_formatter_filetypes(formatter.name)
       vim.health.report_ok(
         string.format("%s ready (%s)", formatter.name, table.concat(filetypes, ", "))
       )
@@ -31,4 +38,82 @@ M.check = function()
   end
 end
 
+M.show_window = function()
+  local conform = require("conform")
+  local lines = {}
+  local highlights = {}
+  local log = require("conform.log")
+  table.insert(lines, string.format("Log file: %s", log.get_logfile()))
+  table.insert(lines, "")
+
+  ---@param formatters conform.FormatterInfo[]
+  local function append_formatters(formatters)
+    for _, formatter in ipairs(formatters) do
+      if not formatter.available then
+        local line = string.format("%s unavailable: %s", formatter.name, formatter.available_msg)
+        table.insert(lines, line)
+        table.insert(
+          highlights,
+          { "DiagnosticWarn", #lines, formatter.name:len(), formatter.name:len() + 12 }
+        )
+      else
+        local filetypes = get_formatter_filetypes(formatter.name)
+        local line = string.format("%s ready (%s)", formatter.name, table.concat(filetypes, ", "))
+        table.insert(lines, line)
+        table.insert(
+          highlights,
+          { "DiagnosticInfo", #lines, formatter.name:len(), formatter.name:len() + 6 }
+        )
+      end
+    end
+  end
+
+  table.insert(lines, "Formatters for this buffer:")
+  local seen = {}
+  local buf_formatters = conform.list_formatters_for_buffer()
+  for _, formatter in ipairs(buf_formatters) do
+    seen[formatter.name] = true
+  end
+  append_formatters(buf_formatters)
+
+  table.insert(lines, "")
+  table.insert(lines, "Other formatters:")
+  local all_formatters = vim.tbl_filter(function(f)
+    return not seen[f.name]
+  end, conform.list_all_formatters())
+  append_formatters(all_formatters)
+
+  local bufnr = vim.api.nvim_create_buf(false, true)
+  local winid = vim.api.nvim_open_win(bufnr, true, {
+    relative = "editor",
+    border = "rounded",
+    width = vim.o.columns - 6,
+    height = vim.o.lines - 6,
+    col = 2,
+    row = 2,
+    style = "minimal",
+  })
+  vim.api.nvim_buf_set_lines(bufnr, 0, -1, true, lines)
+  vim.bo[bufnr].modifiable = false
+  vim.bo[bufnr].modified = false
+  vim.bo[bufnr].bufhidden = "wipe"
+  vim.keymap.set("n", "q", "<cmd>close<cr>", { buffer = bufnr })
+  vim.keymap.set("n", "<C-c>", "<cmd>close<cr>", { buffer = bufnr })
+  vim.api.nvim_create_autocmd("BufLeave", {
+    desc = "Close info window when leaving buffer",
+    buffer = bufnr,
+    once = true,
+    nested = true,
+    callback = function()
+      if vim.api.nvim_win_is_valid(winid) then
+        vim.api.nvim_win_close(winid, true)
+      end
+    end,
+  })
+  local ns = vim.api.nvim_create_namespace("conform")
+  for _, hl in ipairs(highlights) do
+    vim.api.nvim_buf_add_highlight(bufnr, ns, hl[1], hl[2] - 1, hl[3], hl[4])
+  end
+end
+
 return M
diff --git a/lua/conform/init.lua b/lua/conform/init.lua
index 9ba56bb..b2c3d31 100644
--- a/lua/conform/init.lua
+++ b/lua/conform/init.lua
@@ -90,6 +90,10 @@ M.setup = function(opts)
     })
   end
 
+  vim.api.nvim_create_user_command("ConformInfo", function()
+    require("conform.health").show_window()
+  end, { desc = "Show information about Conform formatters" })
+
   ---@diagnostic disable-next-line: duplicate-set-field
   vim.lsp.handlers["textDocument/formatting"] = function(_, result, ctx, _)
     if not result then
@@ -115,10 +119,11 @@ local function supports_lsp_format(bufnr)
   return false
 end
 
+---@private
 ---@param bufnr? integer
 ---@return conform.FormatterInfo[]
 ---@return conform.RunOptions
-local function list_formatters_for_buffer(bufnr)
+M.list_formatters_for_buffer = function(bufnr)
   if not bufnr or bufnr == 0 then
     bufnr = vim.api.nvim_get_current_buf()
   end
@@ -249,7 +254,7 @@ M.format = function(opts)
     end
   else
     local run_info
-    formatters, run_info = list_formatters_for_buffer(opts.bufnr)
+    formatters, run_info = M.list_formatters_for_buffer(opts.bufnr)
     any_formatters_configured = not vim.tbl_isempty(formatters)
     formatters = filter_formatters(formatters, run_info)
   end
@@ -284,7 +289,7 @@ M.format = function(opts)
       restore()
     end
   elseif any_formatters_configured and not opts.quiet then
-    vim.notify("No formatters found for buffer. See :checkhealth conform", vim.log.levels.WARN)
+    vim.notify("No formatters found for buffer. See :ConformInfo", vim.log.levels.WARN)
   else
     log.debug("No formatters found for %s", vim.api.nvim_buf_get_name(opts.bufnr))
   end
@@ -296,7 +301,7 @@ end
 ---@param bufnr? integer
 ---@return conform.FormatterInfo[]
 M.list_formatters = function(bufnr)
-  local formatters, run_options = list_formatters_for_buffer(bufnr)
+  local formatters, run_options = M.list_formatters_for_buffer(bufnr)
   return filter_formatters(formatters, run_options)
 end