Added plugin `eval`

2 files changed, 24 insertions, 0 deletions

diff --git a/README.md b/README.md
index d631068..7c61a59 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Plugin | Description
 -------|-----------------------------------------
 [`autowrap`](autowrap.lua?raw=1) | Automatically hardwraps lines when typing
 [`bracketmatch`](bracketmatch.lua?raw=1) | [Underlines](https://user-images.githubusercontent.com/3920290/80132745-0c863f00-8594-11ea-8875-c455c6fd7eae.png) matching right-bracket of left-bracket under caret
+[`eval`](eval.lua?raw=1) | Replaces selected Lua code with its evaluated result
 [`gofmt`](gofmt.lua?raw=1) | Auto-formats the current go file, adds the missing imports and the missing return cases
 [`indentguide`](indentguide.lua?raw=1) | Adds [indent guides](https://user-images.githubusercontent.com/3920290/79640716-f9860000-818a-11ea-9c3b-26d10dd0e0c0.png)
 [`language_fe`](language_fe.lua?raw=1) | Syntax for the [fe](https://github.com/rxi/fe) programming language
diff --git a/eval.lua b/eval.lua
new file mode 100644
index 0000000..54e08ba
--- /dev/null
+++ b/eval.lua
@@ -0,0 +1,23 @@
+local core = require "core"
+local command = require "core.command"
+
+
+local function eval(str)
+  local fn, err = load("return " .. str)
+  if not fn then fn, err = load(str) end
+  assert(fn, err)
+  return tostring(fn())
+end
+
+
+command.add("core.docview", {
+  ["eval:insert"] = function()
+    core.command_view:enter("Evaluate And Insert Result", function(cmd)
+      core.active_view.doc:text_input(eval(cmd))
+    end)
+  end,
+
+  ["eval:replace"] = function()
+    core.active_view.doc:replace(eval)
+  end,
+})