feat: pywal theme (#35)

* feat: pywal theme
* docs: add pywal screenshots

Co-authored-by: mtoohey31 <mtoohey31@users.noreply.github.com>

THEMES.md

@@ -3,7 +3,7 @@
 All available themes are only best effort ports by myself/ other users. If you find a theme to be weird/ wrong please open an issue/ pr.
 
 ### auto
-auto is a special theme. It will automaticaly load theme for your colorscheme.
+auto is a special theme. It will automatically load theme for your colorscheme.
 If there's no theme available for your colorscheme then
 it'll try it's best to generate one.
 
@@ -120,7 +120,7 @@ them based you your `background` option.
 </p>
 
 ### iceberg
-It's a combination of icrberg_light and icrberg_dark. It loads either of
+It's a combination of iceberg_light and iceberg_dark. It loads either of
 them based you your `background` option.
 
 ### jellybeans
@@ -247,6 +247,25 @@ them based you your `background` option.
 <img width='700' src='https://user-images.githubusercontent.com/59497618/131224421-3b175d7a-fb14-424c-ad53-03d2c3b2ab71.png'/>
 </p>
 
+### pywal
+pywal is another special theme. It will load the colors from your current [pywal](https://github.com/dylanaraps/pywal) cache, specifically `~/.cache/wal/colors.sh` and generate a theme.
+
+#### `wal --theme ashes`
+
+<img width='700' src='https://user-images.githubusercontent.com/36740602/132101614-8aa90169-a1ed-4911-b09f-31b5bae56cbf.png'/>
+
+#### `wal --theme -l github`
+
+<img width='700' src='https://user-images.githubusercontent.com/36740602/132101617-f3ff65eb-8051-4294-9a55-e6caa9605006.png'/>
+
+#### `wal --theme vscode`
+
+<img width='700' src='https://user-images.githubusercontent.com/36740602/132101619-7d04d748-d478-45a2-983a-f2a93f3c5714.png'/>
+
+#### `wal --theme zenburn`
+
+<img width='700' src='https://user-images.githubusercontent.com/36740602/132101621-505e5bb6-d18a-434c-a0f8-a3904a5c71f2.png'/>
+
 ### seoul256
 <p>
 <img width='700' src='https://user-images.githubusercontent.com/41551030/108649194-2c8cd480-74bd-11eb-8fbc-935d7e0fe921.png'/>
@@ -285,4 +304,4 @@ them based you your `background` option.
 <img width='700' src='https://user-images.githubusercontent.com/41551030/108649411-8db4a800-74bd-11eb-962a-8b73f9fb7124.png'/>
 <img width='700' src='https://user-images.githubusercontent.com/41551030/108649349-6cec5280-74bd-11eb-9ada-8f1cb8b48ec1.png'/>
 <img width='700' src='https://user-images.githubusercontent.com/41551030/108649358-6fe74300-74bd-11eb-9fe2-a955f964e3ce.png'/>
-</p
+</p>

lua/lualine/themes/pywal.lua

@@ -0,0 +1,47 @@
+local lualine_require = require'lualine_require'
+local modules = lualine_require.lazy_require{
+  utils_notices = 'lualine.utils.notices'
+}
+local sep = package.config:sub(1,1)
+local wal_colors_path = table.concat({os.getenv("HOME"), ".cache", "wal", "colors.sh"}, sep)
+local wal_colors_file = io.open(wal_colors_path, "r")
+
+if wal_colors_file == nil then
+  modules.utils_notices.add_notice("lualine.nvim: " .. wal_colors_path .. " not found")
+  error("")
+end
+
+local ok, wal_colors_text = pcall(wal_colors_file.read, wal_colors_file, '*a')
+wal_colors_file:close()
+
+if not ok then
+  modules.utils_notices.add_notice("lualine.nvim: " .. wal_colors_path .. " could not be read: " .. wal_colors_text)
+  error("")
+end
+
+local colors = {}
+
+for line in vim.gsplit(wal_colors_text, '\n') do
+  if line:match('^[a-z0-9]+=\'#[a-f0-9]+\'') ~= nil then
+    local i = line:find('=')
+    local key = line:sub(0, i - 1)
+    local value = line:sub(i + 2, #line - 1)
+    colors[key] = value
+  end
+end
+
+return {
+  normal = {
+    a = {fg = colors.background, bg = colors.color4, gui = 'bold'},
+    b = {fg = colors.foreground, bg = colors.color8},
+    c = {fg = colors.foreground, bg = colors.background}
+  },
+  insert = {a = {fg = colors.background, bg = colors.color2, gui = 'bold'}},
+  visual = {a = {fg = colors.background, bg = colors.color3, gui = 'bold'}},
+  replace = {a = {fg = colors.background, bg = colors.color1, gui = 'bold'}},
+  inactive = {
+    a = {fg = colors.foreground, bg = colors.background, gui = 'bold'},
+    b = {fg = colors.foreground, bg = colors.background},
+    c = {fg = colors.foreground, bg = colors.background}
+  }
+}