Prepends a license notice to a set of files.

addlicense.sh

#!/bin/bash
#
# addlicense.sh - prepends a license notice to a set of files
#
# Originally written by Sam Hanes <sam@maltera.com>.
# To the extent possible under law, the author has waived all copyright
# and related or neighboring rights in this work, which was originally
# published in the United States. Attribution is appreciated but not
# required. The complete legal text of the release is available at
# http://creativecommons.org/publicdomain/zero/1.0/

if [[ $# -lt 3 ]]; then
    echo "usage: addlicense.sh <license file> <target dir> <extension...>" >&2
    exit 1
fi

license=$1
target=$2

shift; shift

if [[ ! -f "$license" ]]; then
    echo "license file '$license' is not a regular file" >&2
    exit 1
fi

if [[ ! -d "$target" ]]; then
    echo "target directory '$target' is not a directory" >&2
    exit 1
fi

predicate="( -name *.$1"
shift

for ext in $@; do
    predicate="$predicate -o -name *.$ext"
done

predicate="$predicate )"

for file in `find -L "$target" \( -type f -a $predicate \) -print`; do
    echo $file
    
    cat "$license" "$file" > /tmp/licenseupdate
    if [[ $? -ne 0 ]]; then
        echo "failed to concatenate file '$file'" >&2
        continue
    fi  

    mv /tmp/licenseupdate $file
    if [[ $? -ne 0 ]]; then
        echo "failed to replace file '$file'" >&2
        continue
    fi  
done