added zsh functions for git

.zsh/functions/chpwd_update_git_vars

@@ -0,0 +1 @@
+update_current_git_vars

.zsh/functions/precmd_update_git_vars

@@ -0,0 +1,4 @@
+if [ -n "$__EXECUTED_GIT_COMMAND" ]; then
+    update_current_git_vars
+    unset __EXECUTED_GIT_COMMAND
+fi

.zsh/functions/preexec_update_git_vars

@@ -0,0 +1,7 @@
+case "$1" in 
+    git*)
+    __EXECUTED_GIT_COMMAND=1
+    ;;
+esac
+
+

.zsh/functions/prompt_git_info

@@ -0,0 +1,21 @@
+if [ -n "$__CURRENT_GIT_BRANCH" ]; then
+    local s="("
+    s+="$__CURRENT_GIT_BRANCH"
+    case "$__CURRENT_GIT_BRANCH_STATUS" in
+        ahead)
+        s+="↑"
+        ;;
+        diverged)
+        s+="↕"
+        ;;
+        behind)
+        s+="↓"
+        ;;
+    esac
+    if [ -n "$__CURRENT_GIT_BRANCH_IS_DIRTY" ]; then
+        s+="⚡"
+    fi
+    s+=")"
+
+    printf " %s%s" "%{${fg[yellow]}%}" $s
+fi

.zsh/functions/update_current_git_vars

@@ -0,0 +1,29 @@
+unset __CURRENT_GIT_BRANCH
+unset __CURRENT_GIT_BRANCH_STATUS
+unset __CURRENT_GIT_BRANCH_IS_DIRTY
+
+local st="$(git status 2>/dev/null)"
+if [[ -n "$st" ]]; then
+    local -a arr
+    arr=(${(f)st})
+
+    if [[ $arr[1] =~ 'Not currently on any branch.' ]]; then
+        __CURRENT_GIT_BRANCH='no-branch'
+    else
+        __CURRENT_GIT_BRANCH="${arr[1][(w)4]}";
+    fi
+
+    if [[ $arr[2] =~ 'Your branch is' ]]; then
+        if [[ $arr[2] =~ 'ahead' ]]; then
+            __CURRENT_GIT_BRANCH_STATUS='ahead'
+        elif [[ $arr[2] =~ 'diverged' ]]; then
+            __CURRENT_GIT_BRANCH_STATUS='diverged'
+        else
+            __CURRENT_GIT_BRANCH_STATUS='behind'
+        fi
+    fi
+
+    if [[ ! $st =~ 'nothing to commit' ]]; then
+        __CURRENT_GIT_BRANCH_IS_DIRTY='1'
+    fi
+fi