#!/usr/bin/env bash

# This script outputs statistics for the current git repository. This script

# is used by the search-core team to understand the size and shape of a

# repository. In particular we use this when understanding the scale of a

# monorepo to help us guide our work.

set -e

# Do everything from the gitdir. Makes ls-tree below also not work on a

# subtree.

cd "$(git rev-parse --git-dir)"

# The size of the git store (not the working copy).

echo "$(du -sh .)" gitdir

# The number of commits reachable from HEAD

echo "$(git rev-list --count HEAD)" commits

# Some awk which extracts statistics on the files in the latest commit.

echo

echo HEAD statistics

git ls-tree -r --long HEAD | awk '

BEGIN {

base = 10

logbase = log(base)

}

$4 != "-" {

if ($4 == 0) {

hist[0]++

} else {

hist[int(log($4) / logbase) + 1]++

}

total += $4

count++

}

END {

printf("%.3fGiB\n%d files\n", total / 1024 / 1024 / 1024, count)

printf("histogram:\n")

for (x in hist) {

printf("%d^%d\t%d\n", base, x, hist[x])

}

}

'