Add side-by-side diff output option

bin/git-diff-ansible-vault

@@ -16,6 +16,7 @@ VAULT_PASSWORD_FILE='./.vault-pass'
 VAULT_ONLY=0
 COLOR=
 VERBOSE=0
+SIDE_BY_SIDE=0
 GIT_CMD='git --no-pager'
 PAGER_CMD=
 
@@ -59,6 +60,7 @@ help() {
         --vault-only                   restrict diff to vault files only
         --color, --colour              turn on coloured output
         --no-color, --no-colour        turn off coloured diff
+        --side-by-side                 side-by-side diff output instead of unified
         --verbose                      display verbose output
     -v, --version                      output program version
     -h, --help                         output help information
@@ -286,8 +288,15 @@ git_diff_ansible_vault() {
       # print the diff heading from git diff so we get the real paths
       echo "$($GIT_CMD -c color.ui=$COLOR diff $GIT_DIFF_ARGS $REVISION $FILE_PATH)" | head -n 4
 
+      # set the diff type (unified is default)
+      if [[ $SIDE_BY_SIDE -eq 1 ]]; then
+        local difftype="-y"
+      else
+        local difftype="-u"
+      fi
+
       # print the diff body from the opened vault diff
-      diff -u \
+      diff $difftype \
         <( decrypted_vault_contents "$old" ) \
         <( decrypted_vault_contents "$new" ) \
         | tail -n +3 | colordiff_wrap
@@ -314,6 +323,7 @@ while test $# -ne 0; do
     --color|--colour) ensure_colordiff; COLOR='always' ;;
     --no-color|--no-colour) COLOR='never' ;;
     --verbose) VERBOSE=1 ;;
+    --side-by-side) SIDE_BY_SIDE=1 ;;
     -v|--version) version; exit ;;
     -h|--help) help; exit ;;
     *)

test/git-diff-ansible-vault.bats

@@ -59,6 +59,42 @@ EOF
 )"
 }
 
+@test "with --side-by-side shows expected output format" {
+  run git diff-ansible-vault -r b479719..c54076a --side-by-side
+  assert_success
+  assert_output "$(cat <<EOF
+diff --git a/public.yml b/public.yml
+index 970074c..1f613c2 100644
+--- a/public.yml
++++ b/public.yml
+@@ -5,3 +5,4 @@ fruits:
+   - Orange
+   - Strawberry
+   - Mango
++  - Banana
+diff --git a/vault.yml b/vault.yml
+index 2e972c1..5fd6cf8 100644
+--- a/vault.yml
++++ b/vault.yml
+- martin:							- martin:
+  name: Martin D'vloper						  name: Martin D'vloper
+  job: Developer						  job: Developer
+  skills:							  skills:
+    - python							    - python
+    - perl							    - perl
+    - pascal							    - pascal
+							      >	    - ruby
+- tabitha:							- tabitha:
+  name: Tabitha Bitumen						  name: Tabitha Bitumen
+  job: Developer						  job: Developer
+  skills:							  skills:
+    - lisp							    - lisp
+    - fortran							    - fortran
+    - erlang							    - erlang
+EOF
+)"
+}
+
 @test "with --path shows work-in-progress changes for that path only" {
   run git diff-ansible-vault -p vault.yml
   assert_success