Delete from a file ?

AlC · Post by **AlC** » September 2nd, 2012, 7:10 pm

Hey,

Summary:

In this topic I wrote lines to a file. And now I want to delete some of the lines again.

This is how notes.hol looks at the moment:

Then I get the values for Month, day and year from Rainmeter. And if a line match those values, that line should be deleted.
Example: Month=9, Day=11, Year=2012 ... The new notes.hol should look like this then

;-------------------------------------------------------------------------

That's my script at the moment

Code: Select all

function Initialize()
end

function Update()

   --Retrieve Measure Settings
	Month=SELF:GetOption('Month','')
	Year=SELF:GetOption('Year','')

	MDay=SELF:GetOption('Day','')
	DayMeter=SKIN:GetMeter(MDay)
	Day=DayMeter:GetOption("Text")

	file=io.input(SKIN:MakePathAbsolute('Holidays/Notes.hol'), 'wb')
	if file then
		
		for line in io.lines() do
					
		word=string.gsub(line,'<Event Month="'..Month..'" Day="'..Day..'" Year="'..Year..'">.+</Event>','')
		
		print(word)
		
		--file:write(word)
	
	end

 end
io.close(file)
SKIN:Bang('!Refresh')

end

I done the "delete-part" with string.gsub, but then I get empty lines where the old lines were (this problem is second-rate).
The main problem is that I can't write "word" to my file. "file:write(word)" does nothing and io.write(word) crashs my Rainmeter.

print(word) looks like that:

And if someone don't understand something properly, please ask. I know my english isn't the best.
Hope someone can help me.

EDIT: With "file:write(word)" I get "Script: DeleteNotes.lua:17: Bad file descriptor" in About.

Post by **smurfier** » September 2nd, 2012, 7:40 pm

Code: Select all

function Update()
	--Retrieve Measure Settings
	Month=SELF:GetOption('Month','')
	Year=SELF:GetOption('Year','')

	MDay=SELF:GetOption('Day','')
	DayMeter=SKIN:GetMeter(MDay)
	Day=DayMeter:GetOption("Text")

	file=io.open(SKIN:MakePathAbsolute('Holidays/Notes.hol'), 'r')
	if file then
		local lines = {}
		for line in file:lines() do   
			line=string.gsub(line,'<Event Month="'..Month..'" Day="'..Day..'" Year="'..Year..'">.+</Event>','')
			if not line == '' then table.insert(lines, line) end
		end
		file:close()
		file=io.open(SKIN:MakePathAbsolute('Holidays/Notes.hol'), 'w')
		file:write(table.concat(lines, '\n'))
		file:close()
	end
 end

AlC · Post by **AlC** » September 2nd, 2012, 8:45 pm

Thank you very much again, smurfier!

There was a little problem, the if statement
"if not line == '' then ... " doesn't fired. I don't know why.
But

Code: Select all

 for line in file:lines() do   
         line=string.gsub(line,'<Event Month="'..Month..'" Day="'..Day..'" Year="'..Year..'">.+</Event>','')

         table.insert(lines, line) end

works perfect !

;-------------------------------------------------------------------------

2 things:
Is there a way to avoid the empty lines in string.gsub, or can I delete empty lines ?

Instead of fire this script on every day, I want something like
1: "delete everything older than this date" example: older than Month=8, Day=30, Year=2012
or if 1 isn't realizable then
2: "delete everything in this month" example: everything in Month=8, Year=2012
I think this could be maybe realizable with a "for-loop". Or can I use if-statements in string.gsub ?

any ideas are very welcome.

Post by **Kaelri** » September 3rd, 2012, 9:04 pm

AlC wrote:2 things:
Is there a way to avoid the empty lines in string.gsub, or can I delete empty lines ?

The if not line == '' part was supposed to get rid of the blank lines. It probably didn't work because there were still some extra characters left over (such as \r, a carriage return).

I would try something like this:

Code: Select all

if line:match('<event') then table.insert(lines, line) end

That should add the lines to the table only if the string.gsub did not match the date given.

AlC wrote:Instead of fire this script on every day, I want something like
1: "delete everything older than this date" example: older than Month=8, Day=30, Year=2012

Try this:

Code: Select all

local OptionTime  = os.time{ month = Month, day = Day, year = Year }

for line in file:lines() do   
	local EventMonth, EventDay, EventYear = line:match('<Event Month="(%d-)" Day="(%d-)" Year="(%d-)">.+</Event>')

	local EventTime   = os.time{ month = EventMonth, day = EventDay, year = EventYear }

	if EventTime >= OptionTime then table.insert(lines, line) end
end

Delete from a file ?

Delete from a file ?

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