From 85a4b244d0c8fbf4fa660ef88725e0a0ce5f854e Mon Sep 17 00:00:00 2001
From: RhiobeT <rhiobet@gmail.com>
Date: Fri, 26 Aug 2022 17:46:55 +0200
Subject: [PATCH] [NeoVim] Display PNGs directly in floating windows

---
 .config/nvim/fnl/plugins.fnl           |  6 +++--
 .config/nvim/fnl/settings/neo-tree.fnl | 32 ++++++++++++++++++++++----
 2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/.config/nvim/fnl/plugins.fnl b/.config/nvim/fnl/plugins.fnl
index cfac35e..50dd237 100644
--- a/.config/nvim/fnl/plugins.fnl
+++ b/.config/nvim/fnl/plugins.fnl
@@ -32,8 +32,10 @@
                    :nvim-telescope/telescope.nvim
                    :kyazdani42/nvim-web-devicons
                    :MunifTanjim/nui.nvim
-                   :s1n7ax/nvim-window-picker]
-        :after [:nvim-window-picker]
+                   :s1n7ax/nvim-window-picker
+                   :edluffy/hologram.nvim]
+        :after [:nvim-window-picker
+                :hologram.nvim]
         :module :settings.neo-tree)
 
   (use! :mrjones2014/smart-splits.nvim
diff --git a/.config/nvim/fnl/settings/neo-tree.fnl b/.config/nvim/fnl/settings/neo-tree.fnl
index 127454b..0d1009c 100644
--- a/.config/nvim/fnl/settings/neo-tree.fnl
+++ b/.config/nvim/fnl/settings/neo-tree.fnl
@@ -21,10 +21,34 @@
                                     :<S-Left>  (fn [])}}
                 :commands {:custom_open (fn [state]
                                           (let [node        (state.tree:get_node)
-                                                quoted_path (.. "'" (.. (node:get_id) "'"))]
-                                            (exec [[:silent "!file -bL --mime" quoted_path "| grep -qv '^text\\|^inode' && xdg-open" quoted_path "&"]])
-                                            (if (= vim.v.shell_error 1)
-                                                  ((. (require :neo-tree.sources.filesystem.commands) :open) state))))}}
+                                                path        (node:get_id)
+                                                quoted_path (.. "'" (.. path "'"))]
+                                            (match (path:match "^.+%.(.+)$")
+                                              "png" (let [bufnr          (vim.api.nvim_create_buf false true)
+                                                          image          (: (require :hologram.image) :new path {})
+                                                          max_width      (- vim.o.columns 4)
+                                                          max_height     (- vim.o.lines 2)
+                                                          tmp_width      (math.min image.cols max_width)
+                                                          tmp_height     (* image.rows (/ tmp_width image.cols))
+                                                          height         (math.min tmp_height max_height)
+                                                          width          (* image.cols (/ height image.rows))
+                                                          winnr          (vim.api.nvim_open_win bufnr true {:relative "editor"
+                                                                                                            :width (math.ceil width)
+                                                                                                            :height (+ (math.ceil height) 1)
+                                                                                                            :row 0
+                                                                                                            :col 2})]
+                                                      (exec [[:setlocal "nonumber"]])
+                                                      (vim.api.nvim_buf_attach bufnr false {:on_detach (fn [_ bufnr]
+                                                                                                         (image:delete bufnr {:free true}))})
+                                                      (image:display 1 0 bufnr {}))
+                                              _     (do
+                                                      (exec [[:silent
+                                                              "!file -bL --mime" quoted_path
+                                                              "| grep -qv '^text\\|^inode' "
+                                                              "&& xdg-open" quoted_path
+                                                              "&"]])
+                                                      (if (= vim.v.shell_error 1)
+                                                            ((. (require :neo-tree.sources.filesystem.commands) :open) state))))))}}
    :renderers {:directory [[:indent]
                            [:icon]
                            [:current_filter]