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#!/bin/sh
# vipatch -- edit unified diff
# This is a simple awk script that re-adjusts headers in
# a patch generated by diff -u, depending on the actual
# number of added/removed lines. As the script performs no
# error checks, it is up to the user to edit (and verify)
# the patch correctly.
ep | awk '
/^@@ / {
head = $0 "\n"
next
}
head && /^---/ {
end()
print
next
}
head && /^\+/ { plus++ }
head && /^-/ { minus++ }
head {
body = body $0 "\n"
next
}
{ print }
END { end() }
function end() {
match(head, /,[0-9]+/)
old = substr(head, RSTART+1, RLENGTH-1)
new = old + plus - minus
match(head, /^@@ -[0-9]+,[0-9]+ \+[0-9]+,/)
prefix = substr(head, RSTART, RLENGTH)
match(head, / @@.*/)
suffix = substr(head, RSTART, RLENGTH)
printf "%s%d%s", prefix, new, suffix
printf "%s", body
head = ""
body = ""
plus = 0
minus = 0
}
'
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