Split LayoutTests in several jobs

layout-tests-split

#!/usr/bin/env bash

function usage {
    echo "Usage: layout-tests-split [jobs] [webkit-dir]"
}

JOBS="${1:-1}"
WEBKIT_DIR="${2:-.}"
LAYOUT_TESTS_DIR="$WEBKIT_DIR/LayoutTests/"

if [[ ! -d "$LAYOUT_TESTS_DIR" ]]; then
    echo "Couldn't find layout tests dir at '$LAYOUT_TESTS_DIR'"
    exit 1
fi

OUT="$(mktemp)"
find ${LAYOUT_TESTS_DIR} -name "*.html" 1> $OUT

lines=$(wc -l $OUT | awk '{print $1}')
stride=$(expr $lines / $JOBS)

for i in `seq 1 $JOBS`; do
    echo "layout-tests-$i"
    until=$(expr $i \* $stride)
    if [[ $i == $JOBS ]]; then
        # On the last job, we get until the very end. Stride might be larger.
        diff=$(expr $lines - $until)
        until=$lines
        stride=$(expr $stride + $diff)
    fi
    cat layout-tests | head -n $until | tail -n $stride > "layout-tests-$i"
done