Add find subcommand

Find authors and co-authors in git log

Author: joshua-hill-form3

README.md

@@ -67,6 +67,8 @@ You must use an email address associated with the co-author's GitHub account.
 
 ## Usage
 
+This command expects you to commit using the commit template. If you run `git commit` with the message option `-m/--message` then the commit template is not used and any Co-authored-by trailers in the commit template won't be commited.
+
 Pair with Ann:
 
 ```bash
@@ -96,7 +98,13 @@ aa  'Ann Author <ann.author@example.com>'
 bb  'Bob Book <bob.book@example.com>'
 ```
 
-This command expects you to commit using the commit template. If you run `git commit` with the message option `-m/--message` then the commit template is not used and any Co-authored-by trailers in the commit template won't be commited.
+Find authors in git log:
+
+```bash
+$ git co-author find
+Ann Author <ann.author@example.com>
+Bob Book <bob.book@example.com>
+```
 
 ## Test
 

git-co-author

@@ -5,8 +5,9 @@ set -euo pipefail
 readonly TRAILER_TOKEN="Co-authored-by"
 readonly USAGE="usage: git co-author                Show co-authors in commit template
    or: git co-author <initials>...  Update co-authors in commit template
+   or: git co-author authors        List authors in git config
    or: git co-author clear          Remove all co-authors from commit template
-   or: git co-author authors        List authors in git config"
+   or: git co-author find           Find authors in git log"
 
 main() {
   if [[ $# -eq 0 ]]
@@ -23,11 +24,14 @@ main() {
   done
 
   case "$1" in
+  authors)
+    list_authors
+    ;;
   clear)
     clear_trailers
     ;;
-  authors)
-    list_authors
+  find)
+    find_authors
     ;;
   esac
 
@@ -56,6 +60,14 @@ list_authors() {
   exit 0
 }
 
+find_authors() {
+  {
+    git log --pretty="%an <%ae>";
+    git log --pretty="%(trailers:key=Co-authored-by,valueonly,only)" | awk NF;
+  } | sort | uniq
+  exit 0
+}
+
 update_trailers() {
   ensure_template_file
   must_have_initials "$@"

test/git-co-author.bats

@@ -9,13 +9,12 @@ setup() {
 
   mkdir -p "$test_dir"
   cd "$test_dir" || exit 1
+  rm -rf .git/
 
-  if ! git status &> /dev/null
-  then
-    git init
-  fi
-
+  git init
   git config --local commit.template "$template_file"
+  git config --local user.name 'Ann Author'
+  git config --local user.email 'ann.author@example.com'
   git config --local co-authors.aa 'Ann Author <ann.author@example.com>'
   git config --local co-authors.bb 'Bob Book <bob.book@example.com>'
   git config --local --unset co-authors.ab || true
@@ -210,6 +209,56 @@ bb-2  'Bobby Book <bobby.book@example.com>'" ]
   [ "${lines[0]}" = "No authors in config." ]
 }
 
+@test "find sumcommand prints errors when not in a git repository" {
+  rm -rf .git/
+
+  run git co-author find
+  [ $status -eq 128 ]
+  [[ "${lines[0]}" =~ ^fatal:.* ]]
+}
+
+@test "find subcommand prints error when there are no commits" {
+  run git co-author find
+  [ $status -eq 128 ]
+  [[ "${lines[0]}" =~ ^fatal:.* ]]
+}
+
+@test "find subcommand prints authors in git log" {
+  git commit --allow-empty -m'Test'
+  git commit --allow-empty -m'Test' --author="Bob Book <bob.book@example.com>"
+
+  run git co-author find
+  [ $status -eq 0 ]
+  [ "$output" = "Ann Author <ann.author@example.com>
+Bob Book <bob.book@example.com>" ]
+}
+
+@test "find subcommand prints co-authors in git log" {
+  git commit --allow-empty -m'Test
+
+Co-authored-by: Bob Book <bob.book@example.com>'
+  git commit --allow-empty -m'Test
+
+Co-authored-by: Anna Book <anna.book@example.com>'
+
+  run git co-author find
+  [ $status -eq 0 ]
+  [ "$output" = "Ann Author <ann.author@example.com>
+Anna Book <anna.book@example.com>
+Bob Book <bob.book@example.com>" ]
+}
+
+@test "find subcommand does not print other trailers in git log" {
+  git commit --allow-empty -m"Test
+
+Some-token: some value
+Another-token: another value"
+
+  run git co-author find
+  [ $status -eq 0 ]
+  [ "$output" = "Ann Author <ann.author@example.com>" ]
+}
+
 @test "adds a co-author" {
   run git-co-author aa
   [ $status -eq 0 ]