handle a/b from github

nixos/aliases.zsh

@@ -3,6 +3,20 @@ alias gb='git branch'
 alias gs='git status'
 alias gpcb='git push origin $(git rev-parse --abbrev-ref HEAD)'
 
+function git() {
+  if [[ $1 == clone && $# -ge 2 ]]; then
+    local url=$2
+    # expand foo/bar -> https://github.com/foo/bar.git (no protocol, no dots in host part)
+    if [[ $url =~ ^[A-Za-z0-9_-]+/[A-Za-z0-9_.-]+$ ]]; then
+      url="https://github.com/${url%.git}.git"
+      echo "Cloning $url" >&2
+    fi
+    command git clone "$url" "${@:3}"
+  else
+    command git "$@"
+  fi
+}
+
 alias u='cd ..'
 alias uu='cd ../..'
 alias uuu='cd ../../..'