1 files changed, 90 insertions, 0 deletions
diff --git a/plugins/wordcount.lua b/plugins/wordcount.lua
new file mode 100644
index 0000000..224ad5e
--- /dev/null
+++ b/plugins/wordcount.lua
@@ -0,0 +1,90 @@
+-- mod-version:3
+local core = require "core"
+local style = require "core.style"
+local StatusView = require "core.statusview"
+local CommandView = require "core.commandview"
+local DocView = require "core.docview"
+local Doc = require "core.doc"
+local keymap = require "core.keymap"
+
+
+local words = setmetatable({}, { __mode = "k" })
+
+
+local function compute_line_words(line)
+  local s, total_words = 1, 0
+  while true do
+    local ns, e = line:find("%s+", s)
+    if ns == 1 and e == #line then break end
+    if not e then total_words = math.max(total_words, 1) break end
+    total_words = total_words + 1
+    s = e + 1
+  end
+  return total_words
+end
+
+
+local function compute_words(doc, start_line, end_line)
+  local total_words = 0
+  for i = start_line or 1, end_line or #doc.lines do
+    total_words = total_words + compute_line_words(doc.lines[i])
+  end
+  return total_words
+end
+
+
+local old_raw_insert = Doc.raw_insert
+function Doc:raw_insert(line, col, text, undo_stack, time)
+  if words[self] then
+    local old_count = compute_words(self, line, line)
+    old_raw_insert(self, line, col, text, undo_stack, time)
+    local total_lines, s = 0, 0
+    while true do
+      s = text:find("\n", s + 1, true)
+      if not s then break end
+      total_lines = total_lines + 1
+    end
+    words[self] = words[self] + compute_words(self, line, line + total_lines) - old_count
+  else
+    old_raw_insert(self, line, col, text, undo_stack, time)
+  end
+end
+
+
+local old_raw_remove = Doc.raw_remove
+function Doc:raw_remove(line1, col1, line2, col2, undo_stack, time)
+  if words[self] then
+    local old_count = compute_words(self, line1, line2)
+    old_raw_remove(self, line1, col1, line2, col2, undo_stack, time)
+    words[self] = words[self] + compute_words(self, line1, line1) - old_count
+  else
+    old_raw_remove(self, line1, col1, line2, col2, undo_stack, time)
+  end
+end
+
+
+local old_doc_new = Doc.new
+function Doc:new(...)
+  old_doc_new(self, ...)
+  words[self] = compute_words(self)
+end
+
+local cached_word_length, cached_word_count
+
+core.status_view:add_item(
+  function() return core.active_view:is(DocView) and not core.active_view:is(CommandView) and words[core.active_view.doc] end,
+  "status:word-count",
+  StatusView.Item.RIGHT,
+  function()
+    local selection_text = core.active_view.doc:get_selection_text()
+    if #selection_text ~= cached_word_length then
+      cached_word_count = compute_line_words(selection_text)
+      cached_word_length = #selection_text
+    end
+    if #selection_text > 0 then
+      return { style.text, cached_word_count .. " words" }
+    else
+      return { style.text, words[core.active_view.doc] .. " words" }
+    end
+  end
+)