push2github

#!/bin/bash

# This script uses yajl - http://lloyd.github.com/yajl/   
# The cron setup: */15 * * * * cd /home/slopjong/OpenSpaceDirectory; ./push2github

#################################
### helpers #####################

space_added_updated() {
    
    # What space was added/updated?
    # Assumption: directory changes at most once every 15 minutes otherwise only the first 
    # changed space will appear in the commit message
    
    echo $(git diff directory.json | egrep -o "\+[[:space:]]+.+\:[[:space:]]" | tail -n1 | cut -d'"' -f2)  
}

commit() {
    
    local space="$(space_added_updated)"
    
    if [ "$space" = "" ]
    then
        echo "Nothing to commit"
    else
        git commit directory.json -m "Space added or updated: ${space}"
        echo "Changes committed"
    fi
}

push() {
    git push && git push spaceapi master
}

is_directory_valid() {
    
    # TODO: check how the -q of json_verify can be used within a pipe
    local verification_result=$(echo $1 | json_verify | grep -o invalid)
    
    if [ "$verification_result" = "invalid" ]
    then
        echo false
    else
        echo true
    fi
}

reformat_and_save_directory() {
    echo $1 | json_reformat > directory.json
}


#################################
### main code ###################

main() {
    local directory="$(curl -s http://openspace.slopjong.de/directory.json)"
    
    if $(is_directory_valid "$directory");
    then
        echo "The directory is valid"
        # TODO: use reformat_and_save_directory()
        echo $directory | json_reformat > directory.json && commit && push
    else
        echo "The directory is invalid"
    fi
}

#################################
### test code ###################

# TODO: use shunit2?
#
#   https://shunit2.googlecode.com/svn/trunk/source/2.1/doc/shunit2.html

test_space_added_updated() {
    echo "Run test_space_added_updated"
    echo "---------------------------------"
    
    # simulate a new added space
    local directory="$(curl -s http://openspace.slopjong.de/directory.json)"
    directory=$(echo $directory | sed "s/{/{\"test-space\":\"http:\/\/example.com\",/g")
    reformat_and_save_directory "$directory"
    
    local space="$(space_added_updated)"
    
    echo -n "test(\"\$space\" = \"test-space\") => "
    [[ "$space" = "test-space" ]] && echo "passed";
}

test_is_directory_valid() {
    echo "Run test_is_directory_valid"
    echo "---------------------------------"
    
    local valid_json="{}"
    local invalid_json="{asdfasf}"
    
    echo -n "test \"is_directory_valid(\"$valid_json\") = true\" => "
    [[ "$(is_directory_valid $valid_json)" = true ]] && echo "passed" || echo "failed";
    
    echo -n "test \"is_directory_valid(\"$invalid_json\") = false\" => "
    [[ "$(is_directory_valid $invalid_json)" = false ]] && echo "passed" || echo "failed";
    
    echo "testing false positive and negative (passed means there's no false positive and negative):"
    
    echo -n "test \"is_directory_valid(\"$invalid_json\") = true\" => "
    [[ "$(is_directory_valid $invalid_json)" = true ]] && echo "failed" || echo "passed";
    
    echo -n "test \"is_directory_valid(\"$valid_json\") = false\" => "
    [[ "$(is_directory_valid $valid_json)" = false ]] && echo "failed" || echo "passed";
}

#################################
### now run main or the tests ###

# to run the tests execute "run_tests=true ./push2github" in the shell
if ${run_tests:=false}
then
    echo "Running the tests ..."
    
    echo "================================================="
    test_space_added_updated
    echo "================================================="
    test_is_directory_valid
    echo "================================================="
    
else
    main
fi

####################################################################
# - http://www.linuxjournal.com/content/return-values-bash-functions