From d77acd4f478b6971e0f7b2c9d1d4e721032bc5ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antoine=20M=C3=A9ausoone?=
 <Ameausoone@users.noreply.github.com>
Date: Mon, 11 Nov 2019 15:53:51 +0100
Subject: [PATCH] feat(short_sha): add a shortened sha commit id

---
 README.md            |  8 ++++++++
 entrypoint.sh        |  6 ++++++
 tests/short_sha.bats | 19 +++++++++++++++++++
 3 files changed, 33 insertions(+)
 create mode 100644 tests/short_sha.bats

diff --git a/README.md b/README.md
index c38667f..db2b5ec 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,9 @@ This action slug and expose some github variables.
 - remove leading and trailing `-` caracter,
 - limit the string size to 63 caracters.
 
+Others `Slug`-ish commands are available:
+- `Short SHA` a variable will limit the string size to 8 caracters.
+
 ## Environment Variables
 
 | GitHub environment variable | Slug variable |
@@ -17,6 +20,10 @@ This action slug and expose some github variables.
 | GITHUB_HEAD_REF | GITHUB_HEAD_REF_SLUG |
 | GITHUB_BASE_REF | GITHUB_BASE_REF_SLUG |
 
+| GitHub environment variable | Short variable |
+| - | - |
+| GITHUB_SHA | GITHUB_SHA_SHORT |
+
 ## Example usage
 
 ```yaml
@@ -26,4 +33,5 @@ This action slug and expose some github variables.
     echo ${{ env.GITHUB_REF_SLUG }}
     echo ${{ env.GITHUB_HEAD_REF_SLUG }}
     echo ${{ env.GITHUB_BASE_REF_SLUG }}
+    echo ${{ env.GITHUB_SHA_SHORT }}
 ```
diff --git a/entrypoint.sh b/entrypoint.sh
index f33431b..0083292 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -7,6 +7,12 @@ slug_ref() {
          | cut -c1-63
 }
 
+short_sha(){
+  echo "$1" \
+        | cut -c1-8
+}
+
 echo ::set-env name=GITHUB_REF_SLUG::"$(slug_ref "$GITHUB_REF")"
 echo ::set-env name=GITHUB_HEAD_REF_SLUG::"$(slug_ref "$GITHUB_HEAD_REF")"
 echo ::set-env name=GITHUB_BASE_REF_SLUG::"$(slug_ref "$GITHUB_BASE_REF")"
+echo ::set-env name=GITHUB_SHA_SHORT::"$(short_sha "$GITHUB_SHA")"
diff --git a/tests/short_sha.bats b/tests/short_sha.bats
new file mode 100644
index 0000000..97ef617
--- /dev/null
+++ b/tests/short_sha.bats
@@ -0,0 +1,19 @@
+#!/usr/bin/env bats
+
+@test "Short long hash" {
+  test_short_sha \
+    "a35a1a486a260cfd99c5b6f8c6034a2929ba9b3f" \
+    "a35a1a48"
+}
+
+# Load sluf_ref function
+source entrypoint.sh > /dev/null 2>&1
+
+test_short_sha(){
+  given="${1}"
+  expected="${2}"
+
+  actual="$(short_sha ${given})"
+  echo "expected : [${expected}], actual : [${actual}]"
+  [ "${actual}" == "${expected}" ]
+}
\ No newline at end of file