custom command update

1. Add new command `CopyPath`
2. Revise command `JSONFormat`: implemented using the nvim lua interface
   and fix a few issues. The previous implementation is removed.

plugin/command.lua

@@ -0,0 +1,58 @@
+-- Copy file path to clipboard
+vim.api.nvim_create_user_command("CopyPath", function(context)
+  local full_path = vim.fn.glob("%:p")
+
+  local file_path = nil
+  if context["args"] == "nameonly" then
+    file_path = vim.fn.fnamemodify(full_path, ":t")
+  end
+
+  -- get the file path relative to project root
+  if context["args"] == "relative" then
+    local project_marker = { ".git", "pyproject.toml" }
+    local project_root = vim.fs.root(0, project_marker)
+    if project_root == nil then
+      vim.print("can not find project root")
+      return
+    end
+
+    file_path = string.gsub(full_path, project_root, "<project-root>")
+  end
+
+  if context["args"] == "absolute" then
+    file_path = full_path
+  end
+
+  vim.fn.setreg("+", file_path)
+  vim.print("Filepath copied to clipboard!")
+end, {
+  bang = false,
+  nargs = 1,
+  force = true,
+  desc = "Copy current file path to clipboard",
+  complete = function()
+    return { "nameonly", "relative", "absolute" }
+  end,
+})
+
+-- JSON format part of or the whole file
+vim.api.nvim_create_user_command("JSONFormat", function(context)
+  local range = context["range"]
+  local line1 = context["line1"]
+  local line2 = context["line2"]
+
+  if range == 0 then
+    -- the command is invoked without range, then we assume whole buffer
+    local cmd_str = string.format("%s,%s!python -m json.tool", line1, line2)
+    vim.fn.execute(cmd_str)
+  elseif range == 2 then
+    -- the command is invoked with some range
+    local cmd_str = string.format("%s,%s!python -m json.tool", line1, line2)
+    vim.fn.execute(cmd_str)
+  else
+    vim.api.nvim_err_write(string.format("unsupported range: %s", range))
+  end
+end, {
+  desc = "Format JSON string",
+  range = "%",
+})

plugin/command.vim

@@ -45,6 +45,3 @@ function! s:md_to_pdf() abort
     echoerr "Error running command"
   endif
 endfunction
-
-" json format
-command! -range JSONFormat <line1>,<line2>!python -m json.tool