Add amend-work command

This commit implement issue #125
Add comand amend-work to amend changes also add test for
amend-work command

libexec/git-elegant-amend-work

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -e
+
+default(){
+    local BRANCH=$(__branches 'git branch | grep \*')
+    if [[ "$BRANCH" == "master" ]]; then
+        box "No commits to 'master' branch. Please read more on ${__site}"
+        box "Try 'git elegant start-work' prior to retrying this command."
+        exit 42
+    fi
+    boxtee git add --interactive
+    boxtee git diff --cached --check
+    boxtee git commit --amend
+}

libexec/git-elegant-commands

@@ -12,4 +12,5 @@ default() {
     echo "obtain-work"
     echo "clear-local"
     echo "commands"
+    echo "amend-work"
 }

tests/git-elegant-amend-work.bats

@@ -0,0 +1,31 @@
+#!/usr/bin/env bats
+
+load addons-common
+load addons-fake
+load addons-read
+load addons-git
+
+setup() {
+    init-repo
+}
+
+teardown() {
+    clean-fake
+    clean-git
+}
+
+@test "'amend-work': command works as expected for non-master branch" {
+    fake-pass git "add --interactive"
+    fake-pass git "diff --cached --check"
+    fake-pass git "commit --amend"
+    gitrepo git checkout -b test
+    check git-elegant amend-work
+    [[ "${status}" -eq 0 ]]
+}
+
+@test "'amend-work': exit code is 42 when current local branch is master" {
+    check git-elegant amend-work
+    [[ "${status}" -eq 42 ]]
+    [[ "${lines[@]}" =~ "== No commits to 'master' branch. Please read more on https://elegant-git.bees-hive.org ==" ]]
+    [[ "${lines[@]}" =~ "== Try 'git elegant start-work' prior to retrying this command. ==" ]]
+}

tests/git-elegant-commands.bats

@@ -19,12 +19,13 @@ teardown() {
         "obtain-work"
         "clear-local"
         "commands"
+        "amend-work"
     )
     check git-elegant commands
     for command in {0..12}; do
         [ "${lines[$command]}" = "${COMMANDS[$command]}" ]
     done
-    [ ${#lines[@]} -eq 10 ]
+    [ ${#lines[@]} -eq 11 ]
 }
 
 @test "'commands': default exit code is 0" {