Add window function and receiving information functionality

lua/sourcer/init.lua

@@ -1,14 +1,65 @@
 local M = {}
+local api = vim.api
+local buf, win
+
+local function open_window()
+	buf = api.nvim_create_buf(false, true)
+
+	api.nvim_buf_set_option(buf, "bufhidden", "wipe")
+
+	-- get dimensions
+	local width = api.nvim_get_option("columns")
+	local height = api.nvim_get_option("lines")
+
+	-- calculate our floating window size
+	local win_height = math.ceil(height * 0.8 - 4)
+	local win_width = math.ceil(width * 0.8)
+
+	-- and its starting position
+	local row = math.ceil((height - win_height) / 2 - 1)
+	local col = math.ceil((width - win_width) / 2)
+
+	-- set some options
+	local opts = {
+		style = "minimal",
+		relative = "editor",
+		width = win_width,
+		height = win_height,
+		row = row,
+		col = col,
+	}
+
+	-- and finally create it with buffer attached
+	win = api.nvim_open_win(buf, true, opts)
+end
+
+local function httprequest(url)
+	local command = string.format("wget -q -O - '%s'", url)
+
+	local handle = io.popen(command)
+	local response = ""
+	if handle ~= nil then
+		response = handle:read("*a")
+		handle:close()
+	else
+		response = "ERROR"
+	end
+
+	return response
+end
 
 function M.lookup()
 	local keywords = vim.fn.getreg("*") -- receive yanked text
 	local url = "https://dl.acm.org/action/doSearch?AllField=" .. keywords
 	url, empty = url:gsub(" ", "+")
+	open_window()
+
+	print("Starting the request")
 
 	-- Setup a http socket and request
-	local command = string.format("curl -s '%s'", url)
+	local command = string.format("wget -q -O - '%s'", url)
 
-	-- Execute the curl command and capture its output
+	-- Execute the wget command and capture its output
 	local handle = io.popen(command)
 	local response = ""
 	if handle ~= nil then
@@ -18,25 +69,93 @@ function M.lookup()
 		response = ""
 	end
 
-	-- select doi links from response
-	local b = 1
-	local doi_links = {}
+	-- extract the rss feed link
+	local rss_url = response:match('"https://dl%.acm%.org/action/showFeed%?.-"')
+	if rss_url == nil then
+		print("ERROR in URL")
+		return
+	end
+	rss_url = rss_url:sub(2, #rss_url - 1)
+
+	print("Feed found at: " .. rss_url)
+
+	local rss_content = httprequest(rss_url)
+	print("Received feed content")
+	print(rss_content)
+
+	-- skip initial block
+	local b, b_start = rss_content:find("</image>", 1, false)
+
+	-- select titles from response
+	b = b_start
+	local titles = {}
 	while true do
-		local x, y = response:find("doi/[a-zA-Z]+/10.[0-9]+/[0-9.]+", b, false)
+		local x, y = rss_content:find("<title>.-</title>", b, false)
 
 		-- stop if no further occurrences are found
 		if x == nil or y == nil then
 			break
 		end
 
-		-- save substring to doi_links
-		doi_links:insert(response:sub(x, y))
+		-- save substring to titles
+		table.insert(titles, rss_content:sub(x, y))
+		b = y
+	end
+
+	-- select links from rss_content
+	b = b_start
+	local links = {}
+	while true do
+		local x, y = rss_content:find("<link>.-</link>", b, false)
+
+		-- stop if no further occurrences are found
+		if x == nil or y == nil then
+			break
+		end
+
+		-- save substring to links
+		table.insert(links, rss_content:sub(x, y))
+		b = y
+	end
+
+	-- select dates from rss_content
+	b = b_start
+	local dates = {}
+	while true do
+		local x, y = rss_content:find("<dc:date>.-</dc:date>", b, false)
+
+		-- stop if no further occurrences are found
+		if x == nil or y == nil then
+			break
+		end
+
+		-- save substring to dates
+		table.insert(dates, rss_content:sub(x, y))
+		b = y
+	end
+
+	-- select descriptions from rss_content
+	b = b_start
+	local descriptions = {}
+	while true do
+		local x, y = rss_content:find("<description>.-</description>", b, false)
+
+		-- stop if no further occurrences are found
+		if x == nil or y == nil then
+			break
+		end
+
+		-- save substring to descriptions
+		table.insert(descriptions, rss_content:sub(x, y))
 		b = y
 	end
 
 	print("Keywords: " .. keywords)
 	print("URL: " .. url)
-	print("Links: " .. #doi_links)
+	print("Title: " .. #titles)
+	print("Links: " .. #links)
+	print("Descriptions: " .. #descriptions)
+	print("Dates: " .. #dates)
 end
 
 -- Hardware analysis