add git-fixup and git-squash

.gitconfig

@@ -38,6 +38,9 @@
     pf = push --force-with-lease
     who = shortlog -ns --
     alpha = !~/src/git-alpha/git-alpha
+    default-branch = !git symbolic-ref refs/remotes/origin/HEAD | sed 's@^refs/remotes/origin/@@'
+    fixup = !git-fixup
+    squash = !git-squash
 [core]
     excludesfile = ~/.gitignore
     editor = vim

bin/git-fixup

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -eu
+
+default_branch=$(git default-branch)
+
+git --no-pager log $default_branch.. --pretty=format:"%h  %s" |
+  selecta |
+  awk '{print $1}' |
+  { read commit; git commit --fixup $commit; }

bin/git-squash

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -eu
+
+default_branch=$(git default-branch)
+first_commit=$(git --no-pager log $default_branch.. --pretty=format:%h | tail -1)
+
+git ri $first_commit~1