Limit on amount of Column Icons

[Tanjamuse]

Hello

Is there a limit on the amount of Column Icons I can have, because several of mine doesnt show up, and I've checked that I had the correct rules and columns for where the icons go.

[chaley]

Originally Posted by Tanjamuse

Hello

Is there a limit on the amount of Column Icons I can have, because several of mine doesnt show up, and I've checked that I had the correct rules and columns for where the icons go.

There is no limit to the number of icons or icon rules. However, if you put more icons into a column than can be shown in the space available then the result will be clipped.

Icon rules are evaluated in the order they appear. Evaluation stops at the first rule that produces an icon and is not a "composed" rule, thus ignoring any later rules for that column. My guess is that some rules are missing the "composed" so calibre stops evaluation at such a rule, preventing subsequent rules from being evaluated.

[Tanjamuse]

Does that mean if there is a mistake somewhere, it doesn't go any further for looking?

I don't understand what the "composed" rule means?

[chaley]

Originally Posted by Tanjamuse

Does that mean if there is a mistake somewhere, it doesn't go any further for looking?

I don't understand what the "composed" rule means?

A "composed" rule is one of "composed icon w/text" or "composed icon w/no text". Rules are evaluated on a column-by-column basis. If a rule is "composed" calibre will collect whatever icon(s) the rule returns and then go to the next rule for that column. In other words, calibre composes a large icon from the icons returned by the composed rules. This composition stops when a non-composed rule that returns an icon is encountered, after the icon(s) returned by that non-composed rule are added to the composition.

As for mistakes, it depends. If a non-composed rule returns an icon when it shouldn't, further evaluation is stopped. If a rule does not return an icon when it should, evaluation continues. If an advanced rule is broken, evaluation continues. If the rule returns the wrong icon you get the wrong icon.

[Tanjamuse]

I now get the following error:

calibre, version 2.21.0
ERROR: Unhandled exception: <b>TypeError</b>:sequence item 0: expected string or Unicode, NoneType found

calibre 2.21 isfrozen: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.9
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Successfully initialized third party plugins: User Category && Reading List && Quality Check && Generate Cover && FanFictionDownLoader && Find Duplicates && Wiki Reader && EpubMerge && Read MP3 AudioBook metadata && Manage Series && Modify ePub
Traceback (most recent call last):
File "site-packages\calibre\gui2\preferences\main.py", line 393, in accept
File "site-packages\calibre\gui2\preferences\main.py", line 354, in commit
File "site-packages\calibre\gui2\preferences\look_feel.py", line 460, in commit
File "site-packages\calibre\gui2\preferences\coloring.py", line 1035, in commit
File "site-packages\calibre\gui2\preferences\coloring.py", line 740, in commit
File "site-packages\calibre\library\coloring.py", line 60, in template
TypeError: sequence item 0: expected string or Unicode, NoneType found

[theducks]

That seems to say to me
that something may have gone south on one of your Column Coloring rules

Those are per Library (the columns and/or rules can differ) and are stored in the database

We will need to wait for a Guru to help you recover

[chaley]

Originally Posted by Tanjamuse

I now get the following error:

You have changed the type of a custom column by deleting and recreating it with a different type. There is an icon rule containing a condition testing that column with a test that was valid for the previous column type but is not valid for the new column type.

[chaley]

Originally Posted by Tanjamuse

I now get the following error:

You are welcome. Glad to help.

[Tanjamuse]

What's the difference between "Has" and "Has Pattern"?

[chaley]

Originally Posted by Tanjamuse

What's the difference between "Has" and "Has Pattern"?

"Has" requires that the value in the column (or a sub-value if the column is tags-like) equal the value in the rule. It is equivalent to the search operator "=", e.g., tags:=something.

"Has Pattern" requires that the value in the column match the regular expression in the rule. Depending on the regexp the match can be total or partial. For example, the pattern "ha" will match the value "thank". The pattern "^ha" will match "happens" but will not match "thank". It is equivalent to the search operator "~", e.g., tags:~pat.

The calibre manual section The Search Interface might help differentiate between the two.

[Tanjamuse]

Thanks. I guess the same is true for the "does not have" and "does not have pattern"?

[chaley]

Originally Posted by Tanjamuse

Thanks. I guess the same is true for the "does not have" and "does not have pattern"?

Yes.

They are also the same as the non-multiple text column conditions "is" and "matches pattern".

[Tanjamuse]

Thanks for the help

[chaley]

Originally Posted by Tanjamuse

Thanks for the help

You are welcome. You are pushing boundaries, which helps keep us honest.

[Tanjamuse]

I don't suppose I can use the advance rule in combination with my user categories?

Thanks for all the help