vim: markdown: add link preview helper

1 files changed, 41 insertions, 2 deletions

diff --git a/.vim/lua/misc.lua b/.vim/lua/misc.lua
index 7cb2ad9..0c4d191 100644
--- a/.vim/lua/misc.lua
+++ b/.vim/lua/misc.lua
@@ -18,14 +18,29 @@ function M.file_under_cursor(cb)
   return M.do_under_cursor('<cfile>', cb)
 end
 
-function M.open_under_cursor(cmd)
+function M.open_under_cursor(cmd, detect_cmd)
   return M.file_under_cursor(function(txt)
+    txt = vim.trim(txt)
+    if not cmd and detect_cmd then
+      if vim.regex([[^http.*$]]):match_str(txt) then
+        cmd = 'url-launcher'
+      end
+      if vim.regex([[^(\.\./|[\w\d_/\-])*(\.[\w\d]+)?$]]):match_str(txt) then
+        cmd = ':edit'
+      end
+      vim.notify("open_under_cursor: detected command " .. txt .. " => " .. (cmd or "<nil>"))
+    end
     if not cmd then
       vim.fn.inputsave()
       vim.ui.input('open with: ', function(result) cmd = result end)
       vim.fn.inputrestore()
+      if not cmd then return end
     end
-    if cmd then
+    -- detect vim command
+    if cmd:sub(1, 1) == ":" then
+      vim.cmd(cmd:sub(2) .. ' ' .. txt)
+    else
+      local c
       c = vim.loop.spawn(cmd, { args = {txt} }, function() c:close() end)
     end
   end)
@@ -67,4 +82,28 @@ function M.find_files(dirs)
   require('telescope.builtin').find_files {search_dirs=vim.split(dirs, ',')}
 end
 
+local function render_link_preview(buf, ln, link)
+  local j = require('plenary.job'):new({
+    command = vim.env.SHELL,
+    args = {'-c', [[ curl -sSfL ]] .. link .. [[ | grep -iPo '(?<=property="og:title" content=")([^\"]+)(?=")' ]]},
+    enable_recording = true,
+  })
+  local results, code = j:sync()
+  if not code == 0 or #results == 0 then return end
+
+  local ns = vim.api.nvim_create_namespace('')
+  vim.api.nvim_buf_set_extmark(buf, ns, ln, 0, {
+    virt_text = {{results[1], 'Error'}},
+    virt_text_pos = 'eol'
+  })
+end
+function M.link_preview()
+  local link = vim.fn.expand('<cfile>')
+  if not link then return end
+
+  local ln = (vim.api.nvim_win_get_cursor(0)[1]) - 1
+
+  render_link_preview(0, ln, link)
+end
+
 return M