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#!/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 a commit interval histogram.
#
# 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"
# * `commit_intervals`
# - Get commit intervals (in seconds).
# * `awk '{}'`
# - Generate histogram.
# * `sort -n`
# - Sort in numeric order.
"${commit_intervals}" | awk '
BEGIN {
hr = 60 * 60
}
{
# Round interval to nearest hour:
bin = int($0/hr + 0.5)
hist[bin] += 1
}
END {
for (bin in hist) {
print bin OFS hist[bin]
}
}
' | sort -n
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