add size for gif

filters/img_filter.lua

@@ -1,5 +1,4 @@
 local path = require("pandoc.path")
-local utils = require("pandoc.utils")
 
 local function get_file_absolute_path(file)
 	local current_file = string.gsub(PANDOC_STATE.input_files[1], "([^/]*%.%w+)$", "")
@@ -28,10 +27,6 @@ local is_gif = function(file)
 	local ext = get_file_extension(file)
 	return ext == ".gif"
 end
-
-local src = "src"
-local dist = "dist"
-
 local function get_thumb_path(file)
 	-- add thumbs/ to the path
 	local thumb = string.gsub(file, "([^/]*%.%w+)$", "thumbs/%1")
@@ -40,12 +35,27 @@ local function get_thumb_path(file)
 	return get_file_name(thumb) .. ".webp"
 end
 
-function Image(img)
-	img.attributes.loading = "lazy"
+local set_image_size = function(img, path)
+	local handle = io.popen('identify -format "%w %h\n" ' .. path .. " | head -n1")
+	local result = handle:read("*a")
+	handle:close()
 
-	if is_gif(img.src) then
-		return img
+	local width, height = result:match("(%d+) (%d+)")
+
+	if width then
+		img.attributes.width = width
+	end
+
+	if height then
+		img.attributes.height = height
 	end
+end
+
+local src = "src"
+local dist = "dist"
+
+function Image(img)
+	img.attributes.loading = "lazy"
 
 	local absolute_path = remove_src_prefix(get_file_absolute_path(img.src))
 	local thumb = get_thumb_path(absolute_path)
@@ -54,24 +64,18 @@ function Image(img)
 	local output_file = dist .. thumb
 	local output_path = dist .. remove_file_name(thumb)
 
+	if is_gif(img.src) then
+		set_image_size(img, input_file)
+		img.src = absolute_path
+		return img
+	end
+
 	os.execute("mkdir -p " .. output_path)
 	os.execute("cwebp -resize 640 0 -q 80 " .. input_file .. " -o " .. output_file)
 
 	img.src = thumb
 
-	-- get width and height for thumb image using identify command
-	local handle = io.popen('identify -format "%w %h" ' .. output_file)
-	local result = handle:read("*a")
-	handle:close()
-	local width, height = result:match("(%d+) (%d+)")
-
-	if width then
-		img.attributes.width = width
-	end
-
-	if height then
-		img.attributes.height = height
-	end
+	set_image_size(img, output_file)
 
 	-- Wrap the image in an anchor tag
 	local link = pandoc.Link(img, absolute_path)

templates/default.html

@@ -135,7 +135,8 @@
       }
 
       figure {
-        max-width: 90%;
+        max-width: 98%;
+        margin: 0 auto;
       }
 
       figcaption,