flavours: Check for nvim plugin existence in template

Checks that mini.base16 plugin exists before executing its setup,
and checks that lualine exists before executing its setup.

desktop/.config/flavours/templates/nvim/templates/default.mustache

@@ -7,26 +7,36 @@
 -- by RRethy (https://github.com/RRethy/nvim-base16)
 -- {{scheme-name}} scheme by {{scheme-author}}
 
-require('mini.base16').setup({
+local function exists(plugin)
-    palette = {
+    local status, lib = pcall(require, plugin)
-        base00 = '#{{base00-hex}}',
+    if(status) then return true end
-        base01 = '#{{base01-hex}}',
+    return false
-        base02 = '#{{base02-hex}}',
+end
-        base03 = '#{{base03-hex}}',
+
-        base04 = '#{{base04-hex}}',
+if exists("mini.base16") then
-        base05 = '#{{base05-hex}}',
+    require('mini.base16').setup({
-        base06 = '#{{base06-hex}}',
+        palette = {
-        base07 = '#{{base07-hex}}',
+            base00 = '#{{base00-hex}}',
-        base08 = '#{{base08-hex}}',
+            base01 = '#{{base01-hex}}',
-        base09 = '#{{base09-hex}}',
+            base02 = '#{{base02-hex}}',
-        base0A = '#{{base0A-hex}}',
+            base03 = '#{{base03-hex}}',
-        base0B = '#{{base0B-hex}}',
+            base04 = '#{{base04-hex}}',
-        base0C = '#{{base0C-hex}}',
+            base05 = '#{{base05-hex}}',
-        base0D = '#{{base0D-hex}}',
+            base06 = '#{{base06-hex}}',
-        base0E = '#{{base0E-hex}}',
+            base07 = '#{{base07-hex}}',
-        base0F = '#{{base0F-hex}}'
+            base08 = '#{{base08-hex}}',
-        },
+            base09 = '#{{base09-hex}}',
-})
+            base0A = '#{{base0A-hex}}',
-require('lualine').setup()
+            base0B = '#{{base0B-hex}}',
+            base0C = '#{{base0C-hex}}',
+            base0D = '#{{base0D-hex}}',
+            base0E = '#{{base0E-hex}}',
+            base0F = '#{{base0F-hex}}'
+            },
+    })
+end
+if exists("lualine") then
+    require("lualine").setup()
+end
 
 -- vim: filetype=lua