refactor the source files to make them easier to read and work with

[amtoine]

i would like to refactor the scripts a bit, mainly

• fix some indentation and typos
• use the | pipe symbol at the beginning of the lines instead of the end
  this is both
  • easier to read because one can see the pipe directly when starting a line
  • easier to work with because all the lines of a pipe, except the first obviously, have the same structure and can thus be removed or shuffles without breaking the pipeline

for instance, to change

start-of-pipe |
command-1 |
command-2 |
end-of-pipe

one would have to make sure the | is added to the last command and removed from others when shuffling

with

start-of-pipe
| command-1
| command-2
| end-of-pipe

one can shuffle and remove any of the last three commands without ever breaking the pipeline itself 👍