>> 1) bring the "country ___" line down to each non-country line:
>>
>> :v/^country /?country ?t-|s/country //|j
>> [...]
>> Step #1 is a bit packed:
>>
>> :v/ on every line that doesn't match
>> country the literal text "country "
>> / perform this set of actions:
>> ?country ? look backwards to the most recent
>> line containing "country "
>
> I think i don't understand this: why do you look *backward* for an occurence
> of
> "country" after you find a line that doesn't contain "country"?
Tarlika already answered this (something like "because the
germane country-code is above instead of below"), but skipped the
2nd half (even though it's reasoning falls from her answer)
>> t and copy it
>> - to the line before this match
>> ("-" is short-hand for ".-1")
>
> and why do you do this instead of simply deleting *country* in place?
When you have a "country" line, you don't know how many
non-country lines will follow it, so you have to keep it around
for any further copying-to-subsequent-non-country-lines. So from
her (tweaked by adding Bonn and completing the GER output
section) example:
country GB
London
Birmingham
country GER
Berlin
Bonn
-->
GB London
GB Birmingham
GER Berlin
GER Bonn
It finds London, then copies the "country GB" line before it,
deletes the word "country" and then joins "GB" and "London" to
make "GB London". It then finds Birmingham which also needs to
copy down the previous "country" line and perform the same
sequence of operations. If we had deleted it in-place, it
wouldn't be there to copy down. If we had moved it instead of
deleting it, then we would undo the work we did to put it befor
London. The alternative would still be two passes but something like
1) for each "country" line, join it with the next one and
delete "country "
:g/^country /j|s/country /
2) for each harder-to-identify-non-country-line (harder
because we no longer have "country" on the line to identify
Birmingham and Bonn), copy down the country code from some
harder-to-identify-country-line.
:g/magic-regexp/magic-ex-commands
Hope this helps shed some light on my thought-process :)
-tim
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