Redesign: clear active nav state, Shipping labels + Receipts get free-text/raw print, shared label repository

- Home page is now just the print server overview, no more unrelated
  network links (3D printers, Cockpit) left over from when this was a
  general landing page.
- Navbar shows which section is active; Brother's per-printer buttons
  now live under a dedicated Brother nav item instead of always-visible.
- Shipping labels: paste raw ZPL directly (no need to save to a file
  first), with a Labelary preview link alongside it.
- Receipts: paste already-formatted ESC/POS text directly, printed as-is.
- Both can save what they just printed into a shared label repository
  (lib/label_repository.rb, one JSON file per label under data/labels/)
  for reprinting later -- saving happens independently of whether the
  print itself succeeds, so a failed/offline printer doesn't lose the
  content.

.gitignore

@@ -1,3 +1,5 @@
 .session_secret
 public/files/*
 !public/files/.gitkeep
+data/labels/*
+!data/labels/.gitkeep

app.rb

@@ -4,6 +4,7 @@ require "sinatra/reloader"
 require 'tmpdir'
 require 'net/http'
 require_relative 'lib/receipt_builder'
+require_relative 'lib/label_repository'
 
 set :protection, :except => :frame_options
 set :environment, :production
@@ -24,6 +25,8 @@ TEST_LABEL_PDF = File.join(File.dirname(__FILE__), 'test-label.pdf')
 
 PRINTER_DEVICE_EPSON = '/dev/usb/lp_epson' # see /etc/udev/rules.d/99-epson.rules
 
+LABEL_REPO = LabelRepository.new(File.join(File.dirname(__FILE__), 'data', 'labels'))
+
 BROTHER_PRINTERS = {
   'ql560'  => { port: 8560, label: 'Brother QL-560' },
   'ql700'  => { port: 8700, label: 'Brother QL-700' },
@@ -104,6 +107,16 @@ helpers do
     receipt.print!(PRINTER_DEVICE_EPSON)
   end
 
+  # Prints already-formatted ESC/POS text as-is (just the reset + code page
+  # prefix and a trailing cut) -- for content prepared elsewhere or reprinted
+  # from the label repository, unlike print_receipt's title/body template.
+  def print_raw_escpos(content)
+    receipt = ReceiptBuilder.new
+    receipt.align(:left).text(content)
+    receipt.feed(3).cut
+    receipt.print!(PRINTER_DEVICE_EPSON)
+  end
+
   # Transparently reverse-proxies the current request to one of the
   # brother_ql_web instances, so all three printers (web UI and API alike)
   # are reachable through this single sinatra port instead of their own
@@ -153,9 +166,26 @@ get '/' do
 end
 
 get '/upload' do
+  @labels = LABEL_REPO.all(type: 'zpl')
   erb :upload
 end
 
+post '/shipping/zpl' do
+  zpl = params[:zpl].to_s
+  if zpl.strip.empty?
+    flash 'ZPL text is empty', 'warning'
+  else
+    LABEL_REPO.save(name: params[:save_as], type: 'zpl', content: zpl) unless params[:save_as].to_s.empty?
+    begin
+      print_to_datamax(zpl)
+      flash 'ZPL sent to printer', 'success'
+    rescue => e
+      flash "ZPL print failed (#{e.message})", 'danger'
+    end
+  end
+  redirect '/upload'
+end
+
 post '/upload' do
     if params[:file]
 
@@ -204,6 +234,7 @@ post '/test-print' do
 end
 
 get '/epson' do
+  @labels = LABEL_REPO.all(type: 'escpos')
   erb :epson
 end
 
@@ -217,6 +248,49 @@ post '/epson/print' do
   redirect '/epson'
 end
 
+post '/epson/raw' do
+  content = params[:content].to_s
+  if content.strip.empty?
+    flash 'Receipt text is empty', 'warning'
+  else
+    LABEL_REPO.save(name: params[:save_as], type: 'escpos', content: content) unless params[:save_as].to_s.empty?
+    begin
+      print_raw_escpos(content)
+      flash 'Sent to Epson printer', 'success'
+    rescue => e
+      flash "Epson print failed (#{e.message})", 'danger'
+    end
+  end
+  redirect '/epson'
+end
+
+post '/labels/:id/print' do
+  label = LABEL_REPO.find(params[:id])
+  halt 404, 'unknown label' unless label
+
+  begin
+    case label['type']
+    when 'zpl'
+      print_to_datamax(label['content'])
+    when 'escpos'
+      print_raw_escpos(label['content'])
+    end
+    flash "Printed '#{label['name']}'", 'success'
+  rescue => e
+    flash "Print failed (#{e.message})", 'danger'
+  end
+  redirect_target = label['type'] == 'zpl' ? '/upload' : '/epson'
+  redirect redirect_target
+end
+
+post '/labels/:id/delete' do
+  label = LABEL_REPO.find(params[:id])
+  redirect_target = label && label['type'] == 'zpl' ? '/upload' : '/epson'
+  LABEL_REPO.delete(params[:id])
+  flash 'Label deleted', 'success'
+  redirect redirect_target
+end
+
 get '/brother' do
   @printers = BROTHER_PRINTERS
   erb :brother_picker

lib/label_repository.rb

@@ -0,0 +1,46 @@
+require 'json'
+require 'securerandom'
+require 'fileutils'
+
+# Simple file-backed store for reusable ZPL/ESC-POS label templates -- one
+# JSON file per label under DIR, similar in spirit to brother_ql_web's own
+# label repository. No per-printer targeting yet (type just says which print
+# path to use); that can be added once labels can target any of the five
+# printers via the Brother API.
+class LabelRepository
+  def initialize(dir)
+    @dir = dir
+    FileUtils.mkdir_p(@dir)
+  end
+
+  # type: "zpl" or "escpos"
+  def all(type: nil)
+    Dir.glob(File.join(@dir, '*.json')).map { |f| JSON.parse(File.read(f)) }
+       .select { |l| type.nil? || l['type'] == type }
+       .sort_by { |l| l['name'].downcase }
+  end
+
+  def find(id)
+    path = path_for(id)
+    return nil unless File.exist?(path)
+
+    JSON.parse(File.read(path))
+  end
+
+  def save(name:, type:, content:)
+    id = SecureRandom.uuid
+    label = { 'id' => id, 'name' => name, 'type' => type, 'content' => content }
+    File.write(path_for(id), JSON.generate(label))
+    label
+  end
+
+  def delete(id)
+    File.delete(path_for(id)) if File.exist?(path_for(id))
+  end
+
+  private
+
+  def path_for(id)
+    File.join(@dir, "#{id}.json")
+  end
+end

views/_navbar.erb

@@ -7,21 +7,26 @@
     <div class="collapse navbar-collapse" id="navbarNavDropdown">
       <ul class="navbar-nav me-auto">
         <li class="nav-item">
-          <a class="nav-link" href="/">Home</a>
+          <a class="nav-link <%= 'active' if request.path == '/' %>" href="/">Home</a>
         </li>
         <li class="nav-item">
-          <a class="nav-link" href="/upload">Shipping labels</a>
+          <a class="nav-link <%= 'active' if request.path.start_with?('/brother') %>" href="/brother">Brother</a>
         </li>
         <li class="nav-item">
-          <a class="nav-link" href="/epson">Receipts</a>
+          <a class="nav-link <%= 'active' if request.path == '/upload' %>" href="/upload">Shipping labels</a>
+        </li>
+        <li class="nav-item">
+          <a class="nav-link <%= 'active' if request.path == '/epson' %>" href="/epson">Receipts</a>
         </li>
       </ul>
-      <span class="navbar-text me-2">Brother:</span>
+      <% if request.path.start_with?('/brother') %>
+        <span class="navbar-text me-2">Printer:</span>
         <div class="d-flex gap-1">
           <% BROTHER_PRINTERS.each do |key, info| %>
             <a href="/brother/<%= key %>/" class="btn btn-sm <%= request.path.start_with?("/brother/#{key}/") ? 'btn-primary' : 'btn-outline-secondary' %>"><%= info[:label].sub('Brother ', '') %></a>
           <% end %>
         </div>
+      <% end %>
     </div>
   </div>
 </nav>

views/epson.erb

@@ -1,3 +1,4 @@
+        <h5>Formatted receipt</h5>
         <form action="/epson/print" method="POST">
           <div class="mb-3">
             <label for="title" class="form-label">Title (bold, centered)</label>
@@ -13,3 +14,42 @@
           </div>
           <button class="btn btn-secondary" type="submit">Print</button>
         </form>
+
+        <hr class="mt-4">
+
+        <h5>Free text (already-formatted ESC/POS)</h5>
+        <p>Sent as-is (just reset + code page prefix and a trailing cut), no title/body template applied.</p>
+        <form action="/epson/raw" method="POST">
+          <div class="mb-3">
+            <textarea name="content" class="form-control" rows="8" style="font-family: monospace;"></textarea>
+          </div>
+          <div class="row g-2 align-items-end">
+            <div class="col-auto">
+              <label for="save_as_escpos" class="form-label">Save as (optional)</label>
+              <input name="save_as" class="form-control" type="text" id="save_as_escpos" placeholder="receipt name" />
+            </div>
+            <div class="col-auto">
+              <button class="btn btn-secondary" type="submit">Print</button>
+            </div>
+          </div>
+        </form>
+
+        <% if @labels && !@labels.empty? %>
+          <hr class="mt-4">
+          <h5>Saved receipts</h5>
+          <div class="list-group">
+            <% @labels.each do |label| %>
+              <div class="list-group-item d-flex justify-content-between align-items-center">
+                <%= label['name'] %>
+                <div class="d-flex gap-2">
+                  <form action="/labels/<%= label['id'] %>/print" method="POST">
+                    <button class="btn btn-sm btn-secondary" type="submit">Print</button>
+                  </form>
+                  <form action="/labels/<%= label['id'] %>/delete" method="POST">
+                    <button class="btn btn-sm btn-outline-danger" type="submit">Delete</button>
+                  </form>
+                </div>
+              </div>
+            <% end %>
+          </div>
+        <% end %>

views/index.erb

@@ -1,47 +1,11 @@
 <div class="card">
   <div class="card-body">
-    <h5 class="card-title">Brother Label Designer</h5>
-    <p class="card-text">A web service to print labels on Brother QL label printers.</p>
-    <a href="http://rpi-printserver.local:8560/labeldesigner" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">QL-560</a>
-    <a href="http://rpi-printserver.local:8700/labeldesigner" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">QL-700</a>
-    <a href="http://rpi-printserver.local:9100/labeldesigner" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">QL-1100</a>
-  </div>
-</div>
-<div class="card" >
-  <div class="card-body">
-    <h5 class="card-title">Cockpit</h5>
-    <p class="card-text">Cockpit is a web-based graphical interface for servers, intended for everyone</p>
-    <a href="https://rpi-printserver.local:9090" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">Go</a>
-  </div>
-</div>
-<div class="card" >
-  <div class="card-body">
-    <h5 class="card-title">ZPL Viewer</h5>
-    <p class="card-text">An useful tool for labels in ZPL format.</p>
-    <a href="https://labelary.com/viewer.html" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">Go</a>
-  </div>
-</div>
-<div class="card" >
-  <div class="card-body">
-    <h5 class="card-title">Creality Sonic Pad</h5>
-    <p class="card-text">3D Printer</p>
-    <a href="http://spad-9088.local" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">Fluidd</a>
-    <a href="http://spad-9088.local:8819" class="btn btn-outline-secondary" target="_blank" rel="noopener noreferrer">Mainsail</a>
-    <a href="http://spad-9088.local:7125" class="btn btn-outline-secondary" target="_blank" rel="noopener noreferrer">Moonraker</a>
-  </div>
-</div>
-<div class="card" >
-  <div class="card-body">
-    <h5 class="card-title">Bigtreetech Pad 7 CNC</h5>
-    <p class="card-text">CNC</p>
-    <a href="http://btt-pad7-cnc.local" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">Mainsail</a>
-    <a href="http://btt-pad7-cnc.local:7125" class="btn btn-outline-secondary" target="_blank" rel="noopener noreferrer">Moonraker</a>
-  </div>
-</div>
-<div class="card" >
-  <div class="card-body">
-    <h5 class="card-title">Bigtreetech Pad 7 CAN</h5>
-    <p class="card-text">CAN</p>
-    <a href="http://rpi-btt-pad7-can.local" class="btn btn-secondary" target="_blank" rel="noopener noreferrer">Mainsail</a>
+    <h5 class="card-title">Print server</h5>
+    <p class="card-text">Connected printers:</p>
+    <ul>
+      <li>Datamax-ONeil E4204B Mark III (ZPL, 100x150) -- <a href="/upload">Shipping labels</a></li>
+      <li>Epson TM-T20II (ESC/POS) -- <a href="/epson">Receipts</a></li>
+      <li>Brother QL-560, QL-700, QL-1100 -- <a href="/brother">Brother</a></li>
+    </ul>
   </div>
 </div>

views/upload.erb

@@ -9,3 +9,45 @@
         <form action="/test-print" method="POST" class="mt-3">
           <button class="btn btn-outline-secondary" type="submit">Print test label</button>
         </form>
+
+        <hr class="mt-4">
+
+        <h5>Free text ZPL</h5>
+        <p>
+          <a href="https://labelary.com/viewer.html" target="_blank" rel="noopener noreferrer">Labelary ZPL viewer</a>
+          (preview/build ZPL before pasting it here)
+        </p>
+        <form action="/shipping/zpl" method="POST">
+          <div class="mb-3">
+            <textarea name="zpl" class="form-control" rows="8" placeholder="^XA...^XZ" style="font-family: monospace;"></textarea>
+          </div>
+          <div class="row g-2 align-items-end">
+            <div class="col-auto">
+              <label for="save_as_zpl" class="form-label">Save as (optional)</label>
+              <input name="save_as" class="form-control" type="text" id="save_as_zpl" placeholder="label name" />
+            </div>
+            <div class="col-auto">
+              <button class="btn btn-secondary" type="submit">Print</button>
+            </div>
+          </div>
+        </form>
+
+        <% if @labels && !@labels.empty? %>
+          <hr class="mt-4">
+          <h5>Saved labels</h5>
+          <div class="list-group">
+            <% @labels.each do |label| %>
+              <div class="list-group-item d-flex justify-content-between align-items-center">
+                <%= label['name'] %>
+                <div class="d-flex gap-2">
+                  <form action="/labels/<%= label['id'] %>/print" method="POST">
+                    <button class="btn btn-sm btn-secondary" type="submit">Print</button>
+                  </form>
+                  <form action="/labels/<%= label['id'] %>/delete" method="POST">
+                    <button class="btn btn-sm btn-outline-danger" type="submit">Delete</button>
+                  </form>
+                </div>
+              </div>
+            <% end %>
+          </div>
+        <% end %>