From dc4c196706b2eb92d16a69a935b12fae88613c06 Mon Sep 17 00:00:00 2001
From: rxi <rxi@users.noreply.github.com>
Date: Sat, 18 Apr 2020 15:43:00 +0100
Subject: Added `indentguide` plugin

---
 README.md       |  1 +
 indentguide.lua | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 indentguide.lua

diff --git a/README.md b/README.md
index 85091a0..d6a72f0 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ Plugin | Description
 -------|-----------------------------------------
 [`autowrap`](autowrap.lua?raw=1) | Automatically hardwraps lines when typing
 [`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
 [`language_go`](language_go.lua?raw=1) | Syntax for the [Go](https://golang.org/) programming language
 [`language_jiyu`](language_jiyu.lua?raw=1) | Syntax for the [jiyu](https://github.com/machinamentum/jiyu) programming language
diff --git a/indentguide.lua b/indentguide.lua
new file mode 100644
index 0000000..9d903b7
--- /dev/null
+++ b/indentguide.lua
@@ -0,0 +1,40 @@
+local style = require "core.style"
+local config = require "core.config"
+local DocView = require "core.docview"
+
+
+local function get_line_spaces(doc, idx, dir)
+  local text = doc.lines[idx]
+  if not text then
+    return 0
+  end
+  local s, e = text:find("^%s*")
+  if e == #text then
+    return get_line_spaces(doc, idx + dir, dir)
+  end
+  return e - s + 1
+end
+
+
+local function get_line_indent_guide_spaces(doc, idx)
+  if doc.lines[idx]:find("^%s*\n") then
+    return math.max(
+      get_line_spaces(doc, idx - 1, -1),
+      get_line_spaces(doc, idx + 1,  1))
+  end
+  return get_line_spaces(doc, idx)
+end
+
+
+local draw_line_text = DocView.draw_line_text
+
+function DocView:draw_line_text(idx, x, y)
+  local spaces = get_line_indent_guide_spaces(self.doc, idx)
+  local sw = self:get_font():get_width(" ")
+  local h = self:get_line_height()
+  for i = 0, spaces - 1, config.indent_size do
+    local color = style.guide or style.selection
+    renderer.draw_rect(x + sw * i, y, style.divider_size, h, color)
+  end
+  draw_line_text(self, idx, x, y)
+end
-- 
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