add tree file view, and modify scrollbar

lua/core/overrides/sfm.lua

@@ -0,0 +1,40 @@
+local sfm = require('sfm')
+
+sfm.setup {
+  view = {
+    side = "left", -- side of the tree, can be `left`, `right`
+    width = 30
+  },
+  mappings = {
+    custom_only = false,
+  },
+  renderer = {
+    icons = {
+      file = {
+        default = "#",
+        symlink = "#",
+      },
+      folder = {
+        default = "[|",
+        open = "[/",
+        symlink = "[|",
+        symlink_open = "[/",
+      },
+      indicator = {
+        folder_closed = "",
+        folder_open = "",
+        file = "",
+      },
+    }
+  },
+}:load_extension('sfm-git', {
+  icons = {
+    staged = "^",
+    unstaged = "+",
+    unmerged = "",
+    renamed = ">",
+    untracked = "?",
+    deleted = "x",
+    ignored = "#"
+  }
+})