Templates: various questions not worth their own thread

[chaley]

Originally Posted by ownedbycats

Somewhat related: What happens if a new template function shares the name as an already existing saved template?

Don't know for sure. I think that the existing function will be replaced with a body that returns an error. I am doing other things so I am not going to test this.

[ownedbycats]

This probably won't be a problem unless you plan to name one of the functions has_data(). And I'll probably see it in the changelogs first

[chaley]

Originally Posted by ownedbycats

This probably won't be a problem unless you plan to name one of the functions has_data(). And I'll probably see it in the changelogs first

The equivalent function will be named has_extra_data(). I am also planning to add functions extra_data_files(sep) that returns a sep-separated list of files, extra_data_file_modtime(file_name), and extra_data_file_size(file_name).

[dunhill]

I found something similar in this post ( https://www.mobileread.com/forums/sh...&postcount=537 ) to what I'm looking to do in my library but can't get it to work for me.
Let me explain I have personal identifiers in the ids field
and a personalized column of which store I bought the book.
What I'm looking for is that if the store custom column says Amazon, it only brings me the Amazon ids in another column.
It seems to me that it is the essence of that form but it brings me all the identifiers

[chaley]

Originally Posted by dunhill

I found something similar in this post ( https://www.mobileread.com/forums/sh...&postcount=537 ) to what I'm looking to do in my library but can't get it to work for me.
Let me explain I have personal identifiers in the ids field
and a personalized column of which store I bought the book.
What I'm looking for is that if the store custom column says Amazon, it only brings me the Amazon ids in another column.
It seems to me that it is the essence of that form but it brings me all the identifiers

Sorry but I don't know what you are asking. What doesn't work? What is the template? What are the values it is operating on?

[dunhill]

Originally Posted by chaley

Sorry but I don't know what you are asking. What doesn't work? What is the template? What are the values it is operating on?

I have modified the template to my options

program:

def do_one(ids, check_value, select_identifier):
if = select(ids, select_identifier);
if
!$#libreria==check_value && if
then
return list_difference(ids, strcat(select_identifier, if), ',')
fi;
return ids
fed;

ids = do_one($identifiers, "Amazon",'amazon');
ids = do_one(ids, "Cuspide", 'cuspide');
ids = do_one(ids, "Yenny", 'yenny');
ids = do_one(ids, "Baen", 'baen')


I have a column #libreria is the store where I buy the book
Usually Yenny
and in the identifiers cargo yenny:9789504968566

what I wanted is if in the store field it is Yenny just see the isbn of yenny

[chaley]

Originally Posted by dunhill

I have modified the template to my options
program:

def do_one(ids, check_value, select_identifier):
if = select(ids, select_identifier);
if
!$#libreria==check_value && if
then
return list_difference(ids, strcat(select_identifier, if), ',')
fi;
return ids
fed;

ids = do_one($identifiers, "Amazon",'amazon');
ids = do_one(ids, "Cuspide", 'cuspide');
ids = do_one(ids, "Yenny", 'yenny');
ids = do_one(ids, "Baen", 'baen')

I have a column #libreria is the store where I buy the book
Usually Yenny
and in the identifiers cargo yenny:9789504968566

what I wanted is if in the store field it is Yenny just see the isbn of yenny

That template is incorrect. It uses a variable named 'if', which is a keyword. Here is a corrected version of the template. (Please use code tags for templates!)

program:
	def do_one(ids, check_value, select_identifier):
		sel = select(ids, select_identifier);
		if
			!$#libreria==check_value && sel
		then
			return list_difference(ids, strcat(select_identifier, sel), ',')
		fi;
		return ids
	fed;
	
	ids = do_one($identifiers, "Amazon",'amazon');
	ids = do_one(ids, "Cuspide", 'cuspide');
	ids = do_one(ids, "Yenny", 'yenny');
	ids = do_one(ids, "Baen", 'baen')

That said, I don't understand what this template is supposed to do. The function do_one() seems to do nothing if the check_value (the second parameter) equals the contents of #libreria. Said another way, it removes any identifier where the id name == the third parameter (select_identifier) and the store ($#libreria) does not equal to the second parameter (check_value). For example, the third call to do_one() does nothing if #libreria equals 'yenny', which from your text isn't what you want.

Sorry, but the complexity here is higher than I can cope with.

[ownedbycats]

What is the best way to check a column for multiple patterns and return for any matches? Here is what I have:

program:

omnibus =
	if 
		'Box Set' in $title
		|| 'Complete Series' in $title
		|| '(Books|Volumes) (\d+-\d+)' in $title
	then
		'omnibus'
	else
		''
	fi;

list_union(omnibus, $#admintags, ',')

This is for use in an Action Chain. It adds 'omnibus' to #admintags if the title indicates it's one.

[chaley]

Originally Posted by ownedbycats

What is the best way to check a column for multiple patterns and return for any matches? Here is what I have:

program:

omnibus =
	if 
		'Box Set' in $title
		|| 'Complete Series' in $title
		|| '(Books|Volumes) (\d+-\d+)' in $title
	then
		'omnibus'
	else
		''
	fi;

list_union(omnibus, $#admintags, ',')

This is for use in an Action Chain. It adds 'omnibus' to #admintags if the title indicates it's one.

program:

omnibus =
	if 
		'(Box Set)|(Complete Series)|((Books|Volumes) (\d+-\d+))' in $title
	then
		'omnibus'
	fi;

[ownedbycats]

Yes, I was thinking of doing something like that. Would make adding new patterns a bit tricky. I think that may not be an issue as the ones I have cover 80% of my existing omnibuses - I'm not going for every possible variation, just the most common ones.

[chaley]

Originally Posted by ownedbycats

Yes, I was thinking of doing something like that. Would make adding new patterns a bit tricky. But I'm not going for every possible variation, just the most common ones.

Using regex alternation (or) is much faster than doing sequential checks. And there is nothing to prevent you from adding another check if fitting into alternation is too hard.

[ownedbycats]

Mostly out of curiosity about how something works again.

program: $#timesread + 1
This returns '1'

program: add($#timesread, 1)
This returns '1.0'

Why are they different?

(also just realized I should be using $$, oops...)

[chaley]

Originally Posted by ownedbycats

Mostly out of curiosity about how something works again.

program: $#timesread + 1
This returns '1'

program: add($#timesread, 1)
This returns '1.0'

Why are they different?

(also just realized I should be using $$, oops...)

Because the add() function was defined forever ago to always return a float. This can't change without potentially breaking templates.

The add operator (+) checks the result and converts the float to an int if the fractional part is zero. One can argue that defining it this way was wrong, but so be it.

Before you ask: no, I am not going to change the behavior of either one.

Note that the results are arithmetically identical.

If you don't like the ".0" then use round(), floor(), ceil(), fractional_part(), or format_number() to convert it. Or use re() to strip off the .0, as in

re(add(3), '^(.*)\.0$', '\1')

[ownedbycats]

In this case, the output is being written to an int column so it'd turn out the same anyways.

[dunhill]

Originally Posted by chaley

That template is incorrect. It uses a variable named 'if', which is a keyword. Here is a corrected version of the template. (Please use code tags for templates!)

program:
	def do_one(ids, check_value, select_identifier):
		sel = select(ids, select_identifier);
		if
			!$#libreria==check_value && sel
		then
			return list_difference(ids, strcat(select_identifier, sel), ',')
		fi;
		return ids
	fed;
	
	ids = do_one($identifiers, "Amazon",'amazon');
	ids = do_one(ids, "Cuspide", 'cuspide');
	ids = do_one(ids, "Yenny", 'yenny');
	ids = do_one(ids, "Baen", 'baen')

That said, I don't understand what this template is supposed to do. The function do_one() seems to do nothing if the check_value (the second parameter) equals the contents of #libreria. Said another way, it removes any identifier where the id name == the third parameter (select_identifier) and the store ($#libreria) does not equal to the second parameter (check_value). For example, the third call to do_one() does nothing if #libreria equals 'yenny', which from your text isn't what you want.

Sorry, but the complexity here is higher than I can cope with.

As I said before, I wanted to modify the ownbycats template

But I tell you what I have.
I have a custom identifier yenny and cuspide:

And a library column (which is where I bought the book from) Yenny, Cúspide, Amazon

I would like to have the identifier number in another column depending on the Library column.

If in the library column it says Yenny In another column it would have to show me only the identifier of yenny

If in the library column it says Cúspide In another column it would have to show me only the identifier of cuspide

If in the library column it says Amazon In another column it would have to show me only the amazon identifier

I thought that essentially what the ownbycats template did could help me, if you can guide me in this regard, I would be very grateful