Truncate input to 1K when using pygments guess_lexer.
This function appears to be exponential with input length.
#!/bin/sh
hg init a
cd a
echo 'root' >root
hg add root
hg commit -d '0 0' -u test -m "Adding root node"
echo 'a' >a
hg add a
hg branch a
hg commit -d '1 0' -u test -m "Adding a branch"
hg update -C 0
echo 'b' >b
hg add b
hg branch b
hg commit -d '2 0' -u test -m "Adding b branch"
echo 'bh1' >bh1
hg add bh1
hg commit -d '3 0' -u test -m "Adding b branch head 1"
hg update -C 2
echo 'bh2' >bh2
hg add bh2
hg commit -d '4 0' -u test -m "Adding b branch head 2"
echo 'c' >c
hg add c
hg branch c
hg commit -d '5 0' -u test -m "Adding c branch"
echo 'd' >d
hg add d
hg branch d
hg commit -d '6 0' -u test -m "Adding d branch"
hg branches
echo '-------'
hg branches -a
echo "--- Branch a"
hg log -b a
echo "---- Branch b"
hg log -b b