Utilities for setup scripts.

_utils.bash

# _utils.sh --- Utilities used across all the scripts.

set -e
set -o pipefail

# Prints spaces as a prefix to the command's output.
function prefixed {
    sed -e "s/^/       /"
}

# Checks if command in the first agument is available
# in the host system.
#
# Usage:
#
#   assert_command git
#
# Exits with code 1 if command is not available.
function assert_command {
    cmd="$1"

    command -v $cmd >/dev/null 2>&1 || {
        echo "$cmd: Command required but not found. Aborting." >&2;
        exit 1;
    }

    echo "$cmd: $(command -v $cmd)";
}

# Checks if all specified commands are available in the
# host system.
#
# Usage:
#
#   assert_command git ruby mysql
#
# Exists with code 1 if any of given commands is not
# available in the system.
function assert_commands {
    commands="$@"

    for cmd in $commands; do
        assert_command $cmd
    done
}

# Checks if ruby version is correct.
#
# Usage:
#
#   assert_ruby_version 1.9.3
#
# Command will fail if installed ruby version is lower
# than 1.9.3.
function assert_ruby_version {
    version=$1
    ruby -e 'RUBY_VERSION >= "$1" or exit 1' || exit $?
    ruby -v
}