1 0f4372e2 2022-10-03 op # diffstat
 2 0f4372e2 2022-10-03 op 
 3 0f4372e2 2022-10-03 op Show diff statistics.
 4 0f4372e2 2022-10-03 op 
 5 0f4372e2 2022-10-03 op 	#!/usr/bin/awk -f
 6 0f4372e2 2022-10-03 op 
 7 0f4372e2 2022-10-03 op maybe not 100% correct, but it's one case where being simple yet
 8 0f4372e2 2022-10-03 op slightly wrong is way easier than correct.  It's not a catastrophe to
 9 0f4372e2 2022-10-03 op count some extra lines, while parsing the diff (possibly enclosed in a
10 0f4372e2 2022-10-03 op mail) is hard.
11 0f4372e2 2022-10-03 op 
12 0f4372e2 2022-10-03 op 	/^\+/ { a++ }
13 0f4372e2 2022-10-03 op 	/^\-/ { m++ }
14 0f4372e2 2022-10-03 op 
15 0f4372e2 2022-10-03 op Don't be a sink!  Continue the pipeline so we can further save or apply
16 0f4372e2 2022-10-03 op the diff.
17 0f4372e2 2022-10-03 op 
18 0f4372e2 2022-10-03 op 	// { print $0 }
19 0f4372e2 2022-10-03 op 
20 0f4372e2 2022-10-03 op At the end, print the stats to standard error to avoid mangling the
21 0f4372e2 2022-10-03 op input.  Unfortunately, there doesn't seem to be a "built-in" way of
22 0f4372e2 2022-10-03 op printing to stderr other than using the pseudo-device.
23 0f4372e2 2022-10-03 op 
24 0f4372e2 2022-10-03 op 	END {
25 0f4372e2 2022-10-03 op 		print "+", a > "/dev/stderr"
26 0f4372e2 2022-10-03 op 		print "-", m  > "/dev/stderr"
27 0f4372e2 2022-10-03 op 	}
28 0f4372e2 2022-10-03 op 
29 0f4372e2 2022-10-03 op some example usages:
30 0f4372e2 2022-10-03 op 
31 0f4372e2 2022-10-03 op * cvs -q di | diffstat | tee /tmp/diff | less
32 0f4372e2 2022-10-03 op * git diff | diffstat > /tmp/diff
33 0f4372e2 2022-10-03 op * got di | diffstat | ssh foo 'cd xyz && got patch'