Custom Column - How Long to Read

[Mansoul]

Originally Posted by davidfor

And here was me thinking of doing:

program:
minutes = divide(raw_field('#words'),310);
hours = divide(minutes, 60);
hours = list_item(hours,0,'.');
minutes = subtract(minutes, multiply(hours,60));
minutes = format_number(minutes, '02,.0f');
strcat(hours,':',minutes)

Ugly, but it seems to work. I'd probably combine a couple of lines, but, separating them helps the debugging.

But, I've wanted some of your new functions before. So, I'm happy to see them.

I'm using this now, love it.

[crane3]

One need to add time for high-lighting, annotations, looking up in the dictionary to estimate 'how long to read'. Not needed for people not doing highlighting or annotations or dictionary lookup except for inadvertent highlighting via a touch.

[chaley]

Originally Posted by davidfor

And here was me thinking of doing:

program:
minutes = divide(raw_field('#words'),310);
hours = divide(minutes, 60);
hours = list_item(hours,0,'.');
minutes = subtract(minutes, multiply(hours,60));
minutes = format_number(minutes, '02,.0f');
strcat(hours,':',minutes)

Ugly, but it seems to work. I'd probably combine a couple of lines, but, separating them helps the debugging.

But, I've wanted some of your new functions before. So, I'm happy to see them.

This is a very interesting use of list_item. Cool. It got me thinking about other unusual ways to solve the problem using the period as a separator. I came up with this

program:
	fractional_hours = 3.6982;
	re_group(
		fractional_hours,
		'(.*)(\..*)',
		'{$}:', 
		"program: format_number(multiply($, 60), '02.0f')"
	)

This works as long as there really is a period in the number.

[kcar181]

Originally Posted by davidfor

And here was me thinking of doing:

program:
minutes = divide(raw_field('#words'),310);
hours = divide(minutes, 60);
hours = list_item(hours,0,'.');
minutes = subtract(minutes, multiply(hours,60));
minutes = format_number(minutes, '02,.0f');
strcat(hours,':',minutes)

Ugly, but it seems to work. I'd probably combine a couple of lines, but, separating them helps the debugging.

But, I've wanted some of your new functions before. So, I'm happy to see them.

Oh yay this is awesome

[chaley]

Originally Posted by davidfor

But, I've wanted some of your new functions before. So, I'm happy to see them.

The new functions are in calibre source now and will be included in the next calibre release (not the one today).

[Foxarts]

Originally Posted by kcar181

Oh yay this is awesome

Hi guys, first post here.
Sorry for my english and for my italian version of calibre

Anyway, I'll try to figure out add reading time column as show in this thread, but it doesn't work for me:



I'm using a raw_field that isn't the number of words of the book but just the number of the pages (is what I have at the moment), but the results is always 0:00.

What I miss?

Thanks

my Calibre version: 4.16

[davidfor]

Originally Posted by Foxarts

Hi guys, first post here.
Sorry for my english and for my italian version of calibre

Anyway, I'll try to figure out add reading time column as show in this thread, but it doesn't work for me:

Attachment 181167

I'm using a raw_field that isn't the number of words of the book but just the number of the pages (is what I have at the moment), but the results is always 0:00.

What I miss?

In the original versions, the 310 is the reading speed in words per minute. If you are using the page count, you need to change this to your reading speed in pages per minute.

[dunhill]

I have configured my reading time with this template:
program:

# This program calculate a reading time per hour for an ebook

# Adjustments:
# w_min -> minimum words per minute
# w_max -> maximum words per minute
w_min = 250;
w_max = 300;

# readingtime per hour = 60
p_time = 60;

# Needs a custom column for word count (#words)
# change it to your field name
words = raw_field ('# words');

time1 = format_number (divide (words, multiply (w_max, p_time)), '{0: .2f}');
time2 = format_number (divide (words, multiply (w_min, p_time)), '{0: .2f}');

# Unfortunately Caliber doesn't provide a simple way to convert a float
# into a time string -> I used a regex
# The minutes can be set to use 2 numbers using python number formatting,
# otherwise times are displayed as 4: 4h instead of 4: 04h.
rt1_hour = re (time1, '\. \ d *', '');
rt1_minute = format_number (multiply (subtract (time1, rt1_hour), 60), '{0: 02.0f}');

rt2_hour = re (time2, '\. \ d *', '');
rt2_minute = format_number (multiply (subtract (time2, rt2_hour), 60), '{0: 02.0f}');

readingtime = strcat (rt1_hour, ':', rt1_minute, 'h -', rt2_hour, ':', rt2_minute, 'h');

https://www.mobileread.com/forums/sh....php?p=3534411