Add AsciiDoc preview functionality

1 files changed, 84 insertions, 0 deletions

diff --git a/nvim/dot-config/nvim/lua/asciidoc-preview/init.lua b/nvim/dot-config/nvim/lua/asciidoc-preview/init.lua
new file mode 100644
index 0000000..9061888
--- /dev/null
+++ b/nvim/dot-config/nvim/lua/asciidoc-preview/init.lua
@@ -0,0 +1,84 @@
+local api = vim.api
+local fn = vim.fn
+
+local augroup = api.nvim_create_augroup('AsciiDocPreview', { clear = true })
+
+local config = {
+  convert_cmd = 'asciidoctor -o %html %adoc',
+  preview_cmd = 'xdg-open %html',
+  refresh_interval = 2000,
+}
+
+local function get_html_path()
+  return fn.expand('%:p'):gsub('%.adoc$', '.html')
+end
+
+local function convert_to_html()
+  local adoc_path = fn.expand('%:p')
+  local html_path = get_html_path()
+
+  local cmd = config.convert_cmd
+    :gsub('%%adoc', adoc_path)
+    :gsub('%%html', html_path)
+
+  fn.system(cmd)
+
+  return html_path
+end
+
+local function open_preview()
+  local html_path = get_html_path()
+  local cmd = string.format('%s %s', config.preview_cmd, html_path)
+
+  fn.system(cmd)
+end
+
+local refresh_timer = nil
+
+local function start_auto_refresh()
+  if refresh_timer then
+    refresh_timer:stop()
+  end
+
+  refresh_timer = vim.loop.new_timer()
+  refresh_timer:start(0, config.refresh_interval, vim.schedule_wrap(function()
+    if api.nvim_buf_get_option(0, 'modified') then
+      api.nvim_command('write')
+      convert_to_html()
+    end
+  end))
+end
+
+local function stop_auto_refresh()
+  if refresh_timer then
+    refresh_timer:stop()
+    refresh_timer = nil
+  end
+end
+
+api.nvim_create_user_command('AsciiDocPreviewStart', function()
+  convert_to_html()
+  open_preview()
+  start_auto_refresh()
+end, {})
+
+api.nvim_create_user_command('AsciiDocPreviewStop', function()
+  stop_auto_refresh()
+end, {})
+
+api.nvim_create_autocmd('VimLeave', {
+  group = augroup,
+  callback = function()
+    stop_auto_refresh()
+  end,
+})
+
+return {
+  start_preview = function()
+    convert_to_html()
+    open_preview()
+    start_auto_refresh()
+  end,
+  stop_preview = stop_auto_refresh,
+  config = config
+}