# tabular is the vim plugin
# Print everything before the first comma right aligned, then 1 space,
# then the comma center aligned, then 1 space, then everything after the comma
# left aligned.
:Tabularize /,/r1c1l0
-> abc , def, ghi
# the general pattern
: Tabularize /separator/before separaotr|n space|separator aligned|n space|after separator|n space

#can use vim regex
:Tabularize /^[^,]*\zs,/r0c0l0
-> mean only affect first comma, any ele after count as normal ele