#!/usr/bin/env bash

#

# @license Apache-2.0

#

# Copyright (c) 2017 The Stdlib Authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# Computes the mean commit interval (in seconds).

#

# References:

#

# - Kolassa, Carsten, Dirk Riehle, and Michel A. Salim. 2013. "The Empirical Commit Frequency Distribution of Open Source Projects." In _Proceedings of the 9th International Symposium on Open Collaboration_, 18:1–:8. WikiSym '13. New York, NY, USA: ACM. doi:[10.1145/2491055.2491073](http://dx.doi.org/10.1145/2491055.2491073).

# Determine root directory:

root="$(git rev-parse --show-toplevel)"

# Define the path to a utility to compute commit intervals:

commit_intervals="${root}/tools/git/scripts/commit_intervals"

# Define the path to a utility to compute the arithmetic mean:

mean="${root}/tools/awk/mean.awk"

# * `commit_intervals`

# - Compute commit intervals.

# * `mean`

# - Compute the mean.

"${commit_intervals}" | "${mean}"