Add git-custom-commands

Author: wilsonmar

git-custom-commands/git-echo

@@ -0,0 +1,6 @@
+#!/bin/sh
+# git-echo
+# From repo https://github.com/wilsonmar/git-utilities
+# A test program for git custom commands
+# Usage: git echo hello
+echo $1

git-custom-commands/git-squash

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+#!/bin/sh
+# git-squash
+# From https://coderwall.com/p/bt93ia/extend-git-with-custom-commands
+# Usage: git squash 3
+# squashes the last 3 commits (HEAD~3)
+
+source "$(git --exec-path)/git-sh-setup"
+
+USAGE="COMMITS"
+function _squash() {
+    if [[ $# == 1 ]]; then
+        if [[ -n $(git rev-parse --verify --quiet HEAD~$1) ]]; then
+            git rebase -i HEAD~$1
+        else
+            die "HEAD~$1 does not exist"
+        fi
+    else
+        usage
+    fi  
+}
+
+_squash $1

git-custom-commands/graph-dag

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+#!/bin/bash
+# graph-dag.sh
+# Draw a graphviz diagram of the Git DAG
+# See https://wilsonmar.github.io/git-utilities
+#
+# Labels consist of the short SHA1 and any refs.
+# Unreachable commits (ignoring the reflog) will be marked with an asterisk and
+# drawn with dashed lines.
+#
+# Largely stolen from https://git.wiki.kernel.org/index.php/ExampleScripts
+#
+# Usage:
+#   git graph-dag HEAD~10.. | dot -Tpng | display -antialias
+#
+# Accepts any range or arguments that git rev-list accepts.
+
+set -e
+
+if [[ -z $@ ]] ; then
+    echo -e "Usage: git graph-dag HEAD~10.. | dot -Tpng | display -antialias"
+    exit 1
+fi
+
+echo "digraph lattice {"
+
+# Draw the DAG and connect parents
+git rev-list --parents "$@" |
+    while read commit parents
+    do
+        for p in $parents
+        do
+            echo "n$commit -> n$p"
+        done
+    done
+
+# Make pretty labels with the short sha1 and any refs
+git rev-list --pretty=format:"%H %h %d" "$@" | awk '
+BEGIN {
+    command = "git fsck --unreachable --no-reflogs | cut -d\" \" -f3"
+    while (command | getline unr) unreachable[unr] = 1
+    close(command)
+}
+
+!/^commit/ {
+    refs = ""
+    for (i=3; i<=NF; i++) refs = refs " " $i
+
+    unreachable[$1] == 1 ? isunr = 1 : isunr = 0
+
+    printf "n%s [shape=Mrecord, style=%s, label=\"{%s%s}\"]\n", \
+        $1, \
+        isunr == 1 ? "dashed" : "filled", \
+        isunr == 1 ? "*" $2 : $2, \
+        refs == "" ? "" : refs
+}'
+
+echo "}"