RepRapFirmware style M23 select file

RepRapFirmware enumerates the gcode files starting at /gcode, it will
also interpret any relative path as being relative to that folder.
However a full absolute path will actually interpret as from the real
root of the SD card :-(

docs/configuration/config_yaml.rst

@@ -434,6 +434,9 @@ Use the following settings to enable or disable OctoPrint features:
      # Specifies whether support for SD printing and file management should be enabled
      sdSupport: true
 
+     # Specifies whether firmware expects relative paths for selecting SD files
+     sdRelativePath: false
+
      # Whether to always assume that an SD card is present in the printer.
      # Needed by some firmwares which don't report the SD card status properly.
      sdAlwaysAvailable: false

src/octoprint/printer/standard.py

@@ -362,7 +362,7 @@ class Printer(PrinterInterface, comm.MachineComPrintCallback):
 
 		self._printAfterSelect = printAfterSelect
 		self._posAfterSelect = pos
-		self._comm.selectFile("/" + path if sd else path, sd)
+		self._comm.selectFile("/" + path if sd and not settings().getBoolean(["feature", "sdRelativePath"]) else path, sd)
 		self._setProgressData(completion=0)
 		self._setCurrentZ(None)
 

src/octoprint/server/api/settings.py

@@ -68,6 +68,7 @@ def getSettings():
 			"alwaysSendChecksum": s.getBoolean(["feature", "alwaysSendChecksum"]),
 			"neverSendChecksum": s.getBoolean(["feature", "neverSendChecksum"]),
 			"sdSupport": s.getBoolean(["feature", "sdSupport"]),
+			"sdRelativePath": s.getBoolean(["feature", "sdRelativePath"]),
 			"sdAlwaysAvailable": s.getBoolean(["feature", "sdAlwaysAvailable"]),
 			"swallowOkAfterResend": s.getBoolean(["feature", "swallowOkAfterResend"]),
 			"repetierTargetTemp": s.getBoolean(["feature", "repetierTargetTemp"]),
@@ -229,6 +230,7 @@ def _saveSettings(data):
 		if "alwaysSendChecksum" in data["feature"].keys(): s.setBoolean(["feature", "alwaysSendChecksum"], data["feature"]["alwaysSendChecksum"])
 		if "neverSendChecksum" in data["feature"].keys(): s.setBoolean(["feature", "neverSendChecksum"], data["feature"]["neverSendChecksum"])
 		if "sdSupport" in data["feature"].keys(): s.setBoolean(["feature", "sdSupport"], data["feature"]["sdSupport"])
+		if "sdRelativePath" in data["feature"].keys(): s.setBoolean(["feature", "sdRelativePath"], data["feature"]["sdRelativePath"])
 		if "sdAlwaysAvailable" in data["feature"].keys(): s.setBoolean(["feature", "sdAlwaysAvailable"], data["feature"]["sdAlwaysAvailable"])
 		if "swallowOkAfterResend" in data["feature"].keys(): s.setBoolean(["feature", "swallowOkAfterResend"], data["feature"]["swallowOkAfterResend"])
 		if "repetierTargetTemp" in data["feature"].keys(): s.setBoolean(["feature", "repetierTargetTemp"], data["feature"]["repetierTargetTemp"])

src/octoprint/settings.py

@@ -166,6 +166,7 @@ default_settings = {
 		"sendChecksumWithUnknownCommands": False,
 		"unknownCommandsNeedAck": False,
 		"sdSupport": True,
+		"sdRelativePath": False,
 		"sdAlwaysAvailable": False,
 		"swallowOkAfterResend": True,
 		"repetierTargetTemp": False,

src/octoprint/static/js/app/viewmodels/settings.js

@@ -124,6 +124,7 @@ $(function() {
         self.feature_waitForStart = ko.observable(undefined);
         self.feature_sendChecksum = ko.observable("print");
         self.feature_sdSupport = ko.observable(undefined);
+        self.feature_sdRelativePath = ko.observable(undefined);
         self.feature_sdAlwaysAvailable = ko.observable(undefined);
         self.feature_swallowOkAfterResend = ko.observable(undefined);
         self.feature_repetierTargetTemp = ko.observable(undefined);

src/octoprint/templates/dialogs/settings/features.jinja2

@@ -27,6 +27,13 @@
             </label>
         </div>
     </div>
+    <div class="control-group">
+        <div class="controls">
+            <label class="checkbox">
+                <input type="checkbox" data-bind="checked: feature_sdRelativePath" id="settings-sdRelativePath"> {{ _('Select SD files by relative path') }} <span class="label">{{ _('RepRap Firmware') }}</span>
+            </label>
+        </div>
+    </div>
     <div class="control-group">
         <div class="controls">
             <label class="checkbox">