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#!/usr/bin/env lua5.3
-- needs xsel, clipnotify
-- luarocks-5.3 install --local luaposix
-- luarocks-5.3 install --local argparse
-- luarocks-5.3 install --local lsqlite3
-- sqlite3 $(cat /tmp/lclipd_db_name) 'select content from lclipd;' | dmenu -l 10 | xsel -ib
local string = require("string")
local signal = require("posix.signal")
local argparse = require("argparse")
local sys_stat = require("posix.sys.stat")
local unistd = require("posix.unistd")
local posix_syslog = require("posix.syslog")
local sqlite3 = require("lsqlite3")
local sql_create_table = [=[
create table if not exists lclipd (
id integer primary key,
content text unique not null,
dateAdded integer not null
);
]=]
local sql_trigger = [=[
create trigger if not exists hist_prune before insert on lclipd
begin
delete from lclipd
where id = (
select id
from lclipd as o
where (select count(id) from lclipd where content == o.content) > 1
order by id
limit 1
)
and (
select count(id)
from lclipd
) >= XXX;
end;
]=]
local sql_insert = [=[
insert into lclipd(content,dateAdded) values('XXX', unixepoch());
]=]
local pid_file = "/tmp/lclipd.pid"
local db_file_name = "/tmp/lclipd_db_name"
--- We are not longer running.
local function remove_pid_file() os.remove(pid_file) end
--- Adds LUA_PATH and LUA_CPATH to the current interpreters path.
local function default_luarocks_modules()
local luarocks_handle = io.popen("luarocks-5.3 path --bin")
local path_b = false
local cpath_b = false
for line in luarocks_handle:lines() do
local path = string.match(line, "LUA_PATH%s*=%s*('.+')")
local cpath = string.match(line, "LUA_CPATH%s*=%s*('.+')")
if path ~= nil then
package.path = package.path .. ";" .. string.sub(path, 2, -2)
end
if cpath ~= nil then
package.cpath = package.cpath .. ";" .. string.sub(cpath, 2, -2)
end
end
if path_b then os.exit(1) end
if cpath_b then os.exit(1) end
end
default_luarocks_modules()
local function lclip_exit(n)
os.exit(n)
remove_pid_file()
end
local parser = argparse()
parser:option("-s --hist_size", "history file size", 200)
--- Log the given string to syslog with the given priority.
-- @param log_str the string passed to the logging facility
-- @param log_priority the priority of the log string
local function log_to_syslog(log_str, log_priority)
posix_syslog.openlog("clipd",
posix_syslog.LOG_NDELAY | posix_syslog.LOG_PID,
posix_syslog.LOG_LOCAL0)
posix_syslog.syslog(log_priority, log_str)
posix_syslog.closelog()
end
--- Checks to make sure that the pid file for clipd does not exist.
local function check_pid_file()
local f = sys_stat.stat(pid_file)
if f ~= nil then
log_to_syslog("clipd is already running", posix_syslog.LOG_CRIT)
lclip_exit(1)
end
end
--- instance running.
local function write_pid_file()
local f = io.open(pid_file, "w")
if f == nil then
log_to_syslog("cant open pid file for writing", posix_syslog.LOG_CRIT)
lclip_exit(1)
end
f:write(tostring(unistd.getpid()))
end
--- Get the clipboard content from X or wayland.
local function get_clipboard_content()
-- clipnotify exits when there is a new entry on the clipboard
-- so we do want a blocking call here
os.execute("clipnotify")
-- we dont care whether all the calls to clipboard progs succeed
-- or not. so we just mask the errors.
local _, handle_x = pcall(io.popen, "xsel -ob")
handle_x:flush()
local last_clip_entry_x = handle_x:read("*a")
local _, handle_w = pcall(io.popen, "wl-paste")
handle_w:flush()
local last_clip_entry_w = handle_w:read("*a")
local _, handle_p = pcall(io.popen, "pyclip paste")
handle_p:flush()
local last_clip_entry_p = handle_p:read("*a")
if last_clip_entry_p ~= "" then
return last_clip_entry_p
elseif last_clip_entry_w ~= "" then
return last_clip_entry_w
elseif last_clip_entry_x ~= "" then
return last_clip_entry_x
end
end
--- Get the sqlite DB handle.
local function get_sqlite_handle()
local tmp_db_name = "/tmp/" ..
io.popen(
"tr -dc A-Za-z0-9 </dev/urandom | head -c 13"):read(
"*a")
log_to_syslog(tmp_db_name, posix_syslog.LOG_INFO)
local clipDB = sqlite3.open(tmp_db_name,
sqlite3.OPEN_READWRITE + sqlite3.OPEN_CREATE)
if clipDB == nil then
log_to_syslog("could not open the database", posix_syslog.LOG_CRIT)
lclip_exit(1)
end
local tmp_db_file = io.open(db_file_name, "w")
local stdout = io.output()
io.output(tmp_db_file)
io.write(tmp_db_name .. "\n")
io.close(tmp_db_file)
io.output(stdout)
return clipDB
end
--- The clipboard's main loop
-- @param clip_hist_size number of entries limit for the clip history file
local function loop(clip_hist_size)
local sqlite_handle = get_sqlite_handle()
-- create the table if it does not exist
local return_code = sqlite_handle:exec(sql_create_table)
if return_code ~= sqlite3.OK then
log_to_syslog(tostring(return_code), posix_syslog.LOG_CRIT)
log_to_syslog("could not create table", posix_syslog.LOG_CRIT)
lclip_exit(1)
end
-- add the trigger
sql_trigger = sql_trigger:gsub("XXX", clip_hist_size)
return_code = sqlite_handle:exec(sql_trigger)
if return_code ~= sqlite3.OK then
log_to_syslog(tostring(return_code), posix_syslog.LOG_CRIT)
log_to_syslog("could not add trigger to table", posix_syslog.LOG_CRIT)
lclip_exit(1)
end
while true do
local clip_content = get_clipboard_content()
if clip_content ~= nil then
local insert_string = sql_insert:gsub("XXX", clip_content)
sqlite_handle:exec(insert_string)
if return_code ~= sqlite3.OK then
log_to_syslog(tostring(return_code), posix_syslog.LOG_WARNING)
end
end
end
end
--- The entry point.
local function main()
signal.signal(signal.SIGINT, function(signum) os.exit(128 + signum) end)
local args = parser:parse()
check_pid_file()
write_pid_file()
local status, err = pcall(loop, args["hist_size"])
if ~status then log_to_syslog(err, posix_syslog.LOG_CRIT) end
remove_pid_file()
end
main()
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