Print leading zeroes after decimal point

[NotherNgineer]

Fixed the unit_auto_scale() function to enable padding with leading 0's after a decimal point.

For example, when displaying the value 1.025, previously it would appear as "1. 25" (with a space). Now it will correctly display as "1.025".

[gullradriel]

Nice 👌 thanks: :-)

[gullradriel]

Let's see if it's going well after that one 👍

[kallanreed]

Somewhat related: I want a to_string for MHz frequency that doesn’t do padding and other layout things. I just want to give it a frequency and and optional precision and get a properly rounded result back. So like 12345000, precision 0 is “12” precision 1 is “12.3” precision 2 is “12.35”, etc.

[NotherNgineer]

Somewhat related: I want a to_string for MHz frequency that doesn’t do padding and other layout things. I just want to give it a frequency and and optional precision and get a properly rounded result back. So like 12345000, precision 0 is “12” precision 1 is “12.3” precision 2 is “12.35”, etc.

I'll be glad to create one, but busy all day today so it might be tomorrow. Is it just the number of digits to the right of the decimal that you're wanting to specify? (I thought perhaps you were trying to fit a value in a certain length field on the screen in which case the number of digits to the left of the decimal point might dictate the number of digits that will fit on the right) Secondly, note that '0' "padding" after the decimal point will still be desirable as this PR illustrates; e.g. frequency of 12045000 with precision 2 you'd want to be displayed as "12.05", not "12. 5".

[kallanreed]

It's a little bit of a hack, but we could just insert a decimal point into a string. Might be simpler over all.
I guess the trick would be knowing where in the string to put the decimal, but that seems doable.
https://en.cppreference.com/w/cpp/string/basic_string/insert

I guess it could be just to_string the whole value so you have full precision then count from the right for every division by 10. End up with a weird special case for when the value is smaller that what you're dividing by where you have to add leading zeros. 🤔

[NotherNgineer]

Please see if the new function I added in PR #1271 does what you're looking for.