Add Neil's git-lines script

README.md

@@ -72,6 +72,7 @@ If you wrote one of these scripts and want it removed from this collection, plea
 | `git-improved-merge` | Mislav Marohnić's [dotfiles](https://github.com/mislav/dotfiles) | Sophisticated git merge with integrated CI check and automatic cleanup. |
 | `git-incoming-commits` | Ryan Tomayko's [dotfiles](https://github.com/rtomayko/dotfiles) | Adds a remote for the current repository for the given github username. |
 | `git-incoming` | Michael Markert's [dotfiles](https://github.com/cofi/dotfiles) | Show commits in the tracking branch that are not in the local branch. |
+| `git-lines` | Neil Killeen <nkilleen@castlighthealth.com> | Gives you a list of author names with the number of lines last updated by that user in files in the current directory tree with the extension specified. |
 | `git-ls-object-refs` | Ryan Tomayko's [dotfiles](https://github.com/rtomayko/dotfiles) | Find references to an object with SHA1 in refs, commits, and trees. All of them. |
 | `git-maildiff` | Sanjeev Kumar's [blogpost](http://www.devilsan.com/blog/my-first-git-command-git-ipush-using-python) | A simple git command to email diff in color to reviewer/ co-worker. |
 | `git-maxpack` | John Wiegley's [git-scripts](https://github.com/jwiegley/git-scripts) | Compress a repo's pack files as much as possible. |

bin/git-lines

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+#
+# Gives you a list of names with the number of lines last updated by that
+# user in files with the extension specified
+#
+# Copyright 2019, Neil Killeen <nkilleen@castlighthealth.com>
+#
+# Requires GNU sed
+
+set -o pipefail
+
+temp_ifs=$IFS;
+temp_lc_all=$LC_ALL
+IFS="|"
+LC_ALL="C"
+args="$*"
+
+git ls-tree -r HEAD | \
+  gsed -re 's/^.{53}//' | \
+  while read filename; do file "$filename"; done | \
+    grep -E ".*\.(${args})" | \
+    gsed -r -e 's/: .*//' | \
+    while read filename; do git blame -w "$filename"; done | \
+      gsed -r -e 's/.*\((.*)[0-9]{4}-[0-9]{2}-[0-9]{2} .*/\1/' -e 's/ +$//' | \
+      sort -gif | uniq -c
+
+IFS=${temp_ifs}
+LC_ALL=${temp_lc_all}