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Sharing linux/windows scripts and tips
March 30, 2019 — Jesse Harris
Today Clarissa did the shopping and as she was in a rush didn't have the time to total the items in the trolley. She had updated the cost of each item in a shared iCloud note and texted me to see if I could quickly add them up on my computer.
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This is the point where most people would pull out calc.exe and manually sum them. Not I!.
I fired up the iCloud site on my machine and copy and pasted the iCloud note to a fresh vim buffer:
Shopping 2019
1st Isle:
Vedge
Potatoes 4 + 6 6 3 3 5 16.99 2 2 3 3 4.99 5.99 5.99 5.99 12.15 7.99 7.99 8.99
Other vedge for a meat + vedge dinner
Meats
Chicken dinner with a sauce (Indian or Apricot or some other chicken + rice meal)
Lunch Chicken
Sausages
Kids Junk Food
Tiny Teddies (Olivia’s request) 2.49 2.49
Flavoured Rice Cakes 6
Crackers 2.49 2.49
Dairy 2.69
Big tub of greek yogurt
Vanilla Bean Yogurt 3.99 3.99 3.99
Butter - 4.99 4.99 4.99
Milk Powder - 5.69 5.69 5.69
Second Isle
Corn Chips for Nachos
Nacho Salsa
Popcorn 2.49 2.49 9.98
A Cordial or somesuch 2.49
Third Isle
Frozen
Pies 3.55 3
Lasagne? 12
French Fires 1.89 1.89
Chicken Nuggets 2.99 2.99
Cleaning
Garbage Bags 1.79
Mozzie Coils
Last Isle
Food
Spaghetti Pasta .65 .65 1.59 1.59
Tinned Beetroot 1.15
Tinned Spagetti * .85 .85 .85
Indian or rice meal sauce 2.49 .99
Personal
Soap 1.99 3.49
Food
Brown Sugar 2.69
Bread 1.25 1.25
Wraps 1.95 1.95
2.99
8.49
1.99 1.99 1.99
My thought was this:
Best way to figure out a regular expression in vim is to enable these two settings:
:set hlsearch incsearch
With these set, you can begin a search by typing / then as you type results are instantly highlighted.
After a few tries with negative lookbehinds and whatnot, I settled on this:
/\v[a-zA-Z()+*?\- :]
The \v causes Vim to use a more modern regex pattern requiring far less escape characters.
I then ran the search of the whole file:
:%s/\v[a-zA-Z()+*?\- :]/ /g
Then all I had to do was clean up double spaces and the blank lines
:%s/\v^\s+//g " removing leading spaces
:g/\v^$/d " delete blank lines
:%s/\v\s/+/g " replace spaces with +
:%s/\v\n/+/g " replace newlines with +
:%s/\v\+$//g " remove any trailing +'s
You can do this from within Vim using the ! command or drop the shell and do it
:!cat % | bc
Now all that may seem a little over the top for tallying a shopping list, however it's little exercises like this that can help you learn more vim, regex, shell and other useful things
You could of course you another tool to add the numbers up. Here is how to do it using awk having each number on a seperate line:
:!awk '{n+=$1}; END{print n}' %
Using powershell each number on seperate line
:!pwsh -com "&{gc %|\%{[double]\$n+=\$_};\$n}"
Credit for awk and bc goes to this askubuntu answer.
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