Implemented visual line mode

docs/my_prompt.md

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+## Prompt example
+
+This is the `shed` code for the prompt that I currently use. Note that the scripting language for `shed` is essentially identical to bash. This prompt code uses the `\!` escape sequence which lets you use the output of a function as your prompt.
+
+Also note that in `shed`, the `echo` builtin has a new `-p` flag which expands prompt escape sequences. This allows you to access these escape sequences in any context.
+
+```bash
+prompt_topline() {
+  local user_and_host="\e[0m\e[1m$USER\e[1;36m@\e[1;31m$HOST\e[0m"
+  echo -n "\e[1;34m┏━ $user_and_host\n"
+}
+
+prompt_stat_line() {
+  local last_exit_code="$?"
+  local last_cmd_status
+  local last_cmd_runtime
+  if [ "$last_exit_code" -eq "0" ]; then
+    last_cmd_status="\e[1;32m\e[0m"
+  else
+    last_cmd_status="\e[1;31m\e[0m"
+  fi
+  local last_runtime_raw="$(echo -p "\t")"
+  if [ -z "$last_runtime_raw" ]; then
+    return 0
+  else
+    last_cmd_runtime="\e[1;38;2;249;226;175m󰔛 $(echo -p "\T")\e[0m"
+  fi
+
+  echo -n "\e[1;34m┃ $last_cmd_runtime ($last_cmd_status)\n"
+}
+
+prompt_git_line() {
+  git rev-parse --is-inside-work-tree > /dev/null 2>&1 || return
+
+  local gitsigns
+  local status="$(git status --porcelain 2>/dev/null)"
+  local branch="$(git branch --show-current 2>/dev/null)"
+
+  [ -n "$status" ] && echo "$status" | command grep -q '^ [MADR]' && gitsigns="$gitsigns!"
+  [ -n "$status" ] && echo "$status" | command grep -q '^??' && gitsigns="$gitsigns?"
+  [ -n "$status" ] && echo "$status" | command grep -q '^[MADR]' && gitsigns="$gitsigns+"
+
+  local ahead="$(git rev-list --count @{upstream}..HEAD 2>/dev/null)"
+  local behind="$(git rev-list --count HEAD..@{upstream} 2>/dev/null)"
+  [ $ahead -gt 0 ] && gitsigns="$gitsigns↑"
+  [ $behind -gt 0 ] && gitsigns="$gitsigns↓"
+
+  if [ -n "$gitsigns" ] || [ -n "$branch" ]; then
+    if [ -n "$gitsigns" ]; then
+      gitsigns="\e[1;31m[$gitsigns]"
+    fi
+    echo -n "\e[1;34m┃ \e[1;35m ${branch}$gitsigns\e[0m\n"
+  fi
+}
+
+prompt_jobs_line() {
+  local job_count="$(echo -p '\j')"
+  if [ "$job_count" -gt 0 ]; then
+    echo -n "\e[1;34m┃ \e[1;33m󰒓 $job_count job(s) running\e[0m\n"
+  fi
+}
+
+prompt_ssh_line() {
+  local ssh_server="$(echo $SSH_CONNECTION | cut -f3 -d' ')"
+  [ -n "$ssh_server" ] && echo -n "\e[1;34m┃ \e[1;39m🌐 $ssh_server\e[0m\n"
+}
+
+prompt_pwd_line() {
+  echo -p "\e[1;34m┣━━ \e[1;36m\W\e[1;32m/"
+}
+
+prompt_dollar_line() {
+  local dollar="$(echo -p "\$ ")"
+  local dollar="$(echo -e "\e[1;32m$dollar\e[0m")"
+  echo -n "\e[1;34m┗━ $dollar "
+}
+
+prompt() {
+  local statline="$(prompt_stat_line)"
+  local topline="$(prompt_topline)"
+  local gitline="$(prompt_git_line)"
+  local jobsline="$(prompt_jobs_line)"
+  local sshline="$(prompt_ssh_line)"
+  local pwdline="$(prompt_pwd_line)"
+  local dollarline="$(prompt_dollar_line)"
+  local prompt="$topline$statline$gitline$jobsline$sshline$pwdline\n$dollarline"
+
+  echo -en "$prompt"
+}
+
+export PS1="\!prompt "
+```