aliases: Introduce git_parent and associated rebase aliases

.bash_aliases

@@ -90,6 +90,28 @@ alias cont='git rebase --continue'
 alias branch_clean='git branch --merged | egrep -v "(^\*|master|dev)" | xargs git branch -d'
 alias tag_clean='git tag -l | xargs git tag -d && git fetch -t'
 
+function git_parent {
+  git log --pretty=format:"%D"                | \
+    grep -v "^$"                              | \
+    sed "s/, /\n/g"                           | \
+    grep -v "HEAD"                            | \
+    grep -v `git rev-parse --abbrev-ref HEAD` | \
+    grep -v "tag"                             | \
+    head -n1                                  | \
+    sed "s/origin\/\([^,]*\)/\1/"
+}
+
+function git_parent_tag {
+  git log --pretty=format:"%D"                | \
+    grep -v "^$"                              | \
+    sed "s/, /\n/g"                           | \
+    grep -v "HEAD"                            | \
+    grep -v `git rev-parse --abbrev-ref HEAD` | \
+    head -n1                                  | \
+    sed "s/origin\/\([^,]*\)/\1/"             | \
+    sed "s/tag: \([^,]*\)/\1/"
+}
+
 alias log='git log --graph --decorate --oneline'
 
 # Branch
@@ -138,18 +160,46 @@ function grbm {
   git rebase --interactive master
 }
 
-function grbr {
+function grbi {
+  # Save current branch
+  BRANCH=$(git branch | grep \* | cut -d ' ' -f2)
+
+  # Save parent branch
+  PARENT=$(git_parent)
+
+  # Checkout parent & pull
+  git checkout ${PARENT}
+  git pull
+
+  echo "Rebasing on ${PARENT}"
+
+  # Back to previous branch
+  git checkout ${BRANCH}
+  git rebase --interactive ${PARENT}
+}
+
+function grbroot {
   git rebase --interactive --autosquash --root
 }
 
+function ga {
+  git autofixup HEAD~$1
+  git rebase --interactive --autosquash HEAD~$1
+}
+
 function gam {
   git autofixup master
   git rebase --interactive --autosquash master
 }
 
-function ga {
-  git autofixup HEAD~$1
-  git rebase --interactive --autosquash HEAD~$1
+function gai {
+  # Save parent branch
+  PARENT=$(git_parent)
+
+  echo "Rebasing with autofixup on ${PARENT}"
+
+  git autofixup ${PARENT}
+  git rebase --interactive --autosquash ${PARENT}
 }
 
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