Added zsh improvements from work laptop and a doc

home_zsh/.zsh/functions/prompt_git_info

@@ -0,0 +1,32 @@
+# Git prompt stuff
+# http://sebastiancelis.com/2009/11/16/zsh-prompt-git-users/
+
+if [ -n "$__CURRENT_GIT_BRANCH" ]; then
+    local s="("
+    s+="$__CURRENT_GIT_BRANCH"
+    case "$__CURRENT_GIT_BRANCH_STATUS" in
+        ahead)
+        git_color="%{${fg[yellow]}%}"
+        s+="↑"
+        ;;
+        diverged)
+        git_color="%{${fg[yellow]}%}"
+        s+="↕"
+        ;;
+        behind)
+        git_color="%{${fg[yellow]}%}"
+        s+="↓"
+        ;;
+    esac
+    if [ -n "$__CURRENT_GIT_BRANCH_IS_CLEAN" ]; then
+        git_color="%{${fg[green]}%}"
+    fi
+    if [ -n "$__CURRENT_GIT_BRANCH_IS_DIRTY" ]; then
+        git_color="%{${fg[red]}%}"
+        s+="⚡"
+    fi
+    s+=")"
+ 
+    printf " %s%s" "$git_color" $s
+fi
+