add some nil checks, and make lssi work with eatit changes

modules/lssi/lssi.lua

@@ -27,7 +27,7 @@ Takes an input file and code then, it outputs a file with your code in there.
 local mp = require('mp')
 
 mod = {
-  version = 'ALPHA 1', -- the current version of lssi
+  version = 'ALPHA 1.1', -- the current version of lssi
   author = 'squibid',
 }
 
@@ -48,7 +48,7 @@ end
 
 local function logwrite(string)
   if opts.logging.log then
-    io.write(os.date(opts.logging.logdate) .. ' ' .. string .. '\n')
+    io.write(os.date(opts.logging.logdate)..' '..string..'\n')
   end
 end
 
@@ -58,6 +58,7 @@ local function openlog()
     fn = mp.command_native({'expand-path', opts.logging.logfile})
 
     f = io.open(fn, 'a') -- open file buffer
+    if not f then return end
     io.output(f) -- set it as default
   end
 end
@@ -78,28 +79,28 @@ local function inject(infile, l, outfile)
 
   -- don't do anything if there is already code injected into the file
   if string.find(infcont[1], "-- code injected by lssi") then
-    logwrite('code is already injected into ' .. infile)
+    logwrite('code is already injected into '..infile)
     return
   end
-  logwrite('Injecting code into ' .. infile)
+  logwrite('Injecting code into '..infile)
 
   for i in pairs(l) do
     -- add requested line below existing line
     if l[i][2] == 'G' then
-      infcont[tablelength(infcont)] = infcont[tablelength(infcont)] .. '\n' .. l[i][1]
+      infcont[tablelength(infcont)] = infcont[tablelength(infcont)]..'\n'..l[i][1]
     elseif l[i][2] == 'g' then
-      infcont[1] = l[i][1] .. '\n' .. infcont[1]
+      infcont[1] = l[i][1]..'\n'..infcont[1]
     else
-      infcont[l[i][2]] = (infcont[l[i][2]]) .. '\n' .. l[i][1]
+      infcont[l[i][2]] = (infcont[l[i][2]])..'\n'..l[i][1]
     end
   end
 
   local outf = io.open(outfile, 'w')
 
   -- we inject metadata to prevent writing to the file more than once
-  infcont[1] = "-- code injected by lssi " .. mod.version .. '\n' .. infcont[1]
+  infcont[1] = "-- code injected by lssi "..mod.version..'\n'..infcont[1]
   for i, v in ipairs(infcont) do
-    outf:write(v .. '\n')
+    outf:write(v..'\n')
   end
 
   io.close(outf)
@@ -109,20 +110,19 @@ local function checkandinject()
   openlog()
 
   for i = 1, tablelength(plugins) do
-    -- get the file we want to inject our code into
-    local f = mp.command_native({'expand-path', '~~/'}) ..
-      '/' .. plugins[i]['dir'] ..
-      '/' .. plugins[i]['file']
-
     -- check if the plugin has been configured with lssi
-    if plugins[i]['lssi'] then
+    if plugins[i]['lssi'] ~= nil then
+      -- get the file we want to inject our code into
+      local f = mp.command_native({'expand-path', '~~/'}) ..
+        '/'..(plugins[i]['dir'] or 'scripts') ..
+        '/'..plugins[i]['file']
       -- and the file we are trying to modify actually exists
       if fileexists(f) then
         -- inject it! no going back now
         inject(f, plugins[i]['lssi'], f)
       else
         logwrite('Failed to inject code into "' ..
-          plugins[i]['file'] .. '" file does not exist')
+          plugins[i]['file']..'" file does not exist')
       end
     end
   end