bugfix: fix temperature with a floating point.

The start gcode macros in recent versions of Cura
format the print temperature as a floating point.
Other temperature commands in the gcode don't have
such behavior.

On Finder (version 1?) with the more recent firmware, this
causes the temperature to be the fixed to start at 185C,
which appears to be the "default start temperature" or some
rounding error when reading the floating point temperature.

This commit fixes that by parsing the 'M104 SXXX' commands,
and changing the temperature by converting it to integer.
This also allows the temperature to be embedded to the .gx
file header.

I took the opportunity to move the parsing commands into the
gx.py script, as a way to potentially easy the proccess to
make this a standalone script that can potentially be used
by other slicers/software.

Fixes #21
Related to #2 and #16

Makefile

@@ -58,7 +58,10 @@ plugins/FlashforgeFinderIntegration/printer/defs/finder.def.json:
 	git submodule init
 	git submodule update
 
-release: build
+test:
+	find plugins -type f -iname '*_test.py' | xargs -I{} python3 {}
+
+release: build test
 	if [ x"$(VERSION)" = x"master" ] ; then echo "Unable to release from master. Use make VERSION=X.Y.Z" ; exit 1; fi
 	git tag v$(VERSION)
 	git push --tags

plugins/GXWriter/GXWriter.py

@@ -14,10 +14,9 @@
 from UM.i18n import i18nCatalog
 catalog = i18nCatalog("cura")
 
-import re
 from io import StringIO, BufferedIOBase
 from typing import cast, List
-from . import gx
+from .gx import GX
 
 qt_version = 6
 try:
@@ -26,17 +25,6 @@
     qt_version = 5
     from PyQt5 import QtGui, QtCore
 
-# Helper function that extracts values from gcode to add to the binary header.
-def getValue(line, key, default=None):
-    if key not in line:
-        return default
-    else:
-        subPart = line[line.find(key) + len(key):]
-        m = re.search('^-?[0-9]+\\.?[0-9]*', subPart)
-    try:
-        return float(m.group(0))
-    except:
-        return default
 
 # Implements a MeshWriter that creates the xgcode header before the gcode
 # content.
@@ -77,30 +65,14 @@ def write(self, stream, nodes: List[SceneNode], mode = MeshWriter.OutputMode.Bin
     def modify(self, gcode):
         try:
             # Initialize GX header variables
-            g = gx.GX()
-            g.gcode = gcode.encode('latin-1')
-            # Parse values from original gcode
-            self._parse_gcode_info(g, gcode)
-            self._createSnapshot(g)
-            return g.encode()
+            gx = GX.from_gcode(gcode)
+            # Add snapshot image from Cura
+            self._createSnapshot(gx)
+            return gx.encode()
         except Exception:
             Logger.logException("w", "\n*** Failed to create gx file, defaulting to write regular gcode!!! ***\n")
             return gcode.encode('latin-1')
 
-    def _parse_gcode_info(self, gx, gcode):
-        for line in gcode.split("\n"):
-            if line.startswith(';TIME:'):
-                gx.print_time = int(getValue(line, ';TIME:', 0))
-            if line.startswith(';Filament used:'):
-                f = float(line.split(':')[1].split('m')[0].strip())
-                f = f*100
-                gx.filament_usage = int(f)
-            if line.startswith(';Layer height:'):
-                f = float(getValue(line, ';Layer height:', 0))
-                f = f*1000
-                gx.layer_height = int(f)
-        Logger.log("i", "Updated values from struct =>", vars(gx))
-
     def _createSnapshot(self, g, *args):
         Logger.log("i", "Creating thumbnail image ...")
         try:

plugins/GXWriter/gx.py

@@ -6,6 +6,19 @@
 
 import struct
 import base64
+import re
+
+# Helper function that extracts values from gcode to add to the binary header.
+def getValue(line, key, default=None):
+    if key not in line:
+        return default
+    else:
+        subPart = line[line.find(key) + len(key):]
+        m = re.search('^-?[0-9]+\\.?[0-9]*', subPart)
+    try:
+        return float(m.group(0))
+    except:
+        return default
 
 class GX(object):
     """
@@ -103,6 +116,36 @@ def _encode(self):
         buff+= self.gcode
         return buff
 
+    @staticmethod
+    def from_gcode(gcode):
+        gx = GX()
+        gx.gcode = gcode.encode('latin-1')
+        for line in gcode.split("\n"):
+            if line.startswith(';TIME:'):
+                gx.print_time = int(getValue(line, ';TIME:', 0))
+            if line.startswith(';Filament used:'):
+                f = float(line.split(':')[1].split('m')[0].strip())
+                f = f*100
+                gx.filament_usage = int(f)
+            if line.startswith(';Layer height:'):
+                f = float(getValue(line, ';Layer height:', 0))
+                f = f*1000
+                gx.layer_height = int(f)
+            if line.startswith('M104 S'):
+                # Fixes temperature if expressed in float (195.0 -> 195)
+                args = []
+                for a in line.split(' '):
+                    if a.startswith('S'):
+                        t = float(a.replace('S', ''))
+                        t = int(t)
+                        a = "S{}".format(t)
+                        if gx.print_temperature <= 0.00:
+                            # Stores the first temperature to the xgcode header
+                            gx.print_temperature = t
+                    args.append(a)
+                gx.gcode = gx.gcode.replace(line.encode(), ' '.join(args).encode())
+        return gx
+
 # base64 --wrap=80 testdata/cura.bmp | xclip -sel clip
 _SAMPLE_BMP = base64.decodebytes("""
 Qk12OAAAAAAAADYAAAAoAAAAUAAAADwAAAABABgAAAAAAEA4AADDDgAAww4AAAAAAAAAAAAAnJycnJyc

plugins/GXWriter/gx_test.py

@@ -0,0 +1,49 @@
+import unittest
+from gx import GX
+
+test_gcode = """;FLAVOR:Marlin
+;TIME:1066
+;Filament used: 0.681442m
+;Layer height: 0.12
+;MINX:-14
+;MINY:-14
+;MINZ:0.2
+;MAXX:14
+;MAXY:14
+;MAXZ:10.04
+;TARGET_MACHINE.NAME:Flashforge Finder
+;Generated with Cura_SteamEngine 5.6.0
+M82 ;absolute extrusion mode
+M140 S0
+M104 S195.0 T0
+M104 S0 T1
+M107
+G90
+G28
+M132 X Y Z A B
+G1 Z50.00 F400
+G161 X Y F3300
+M6 T0
+M907 X100 Y100 Z40 A80 B20
+M108 T0
+G1 Z.20 F400
+G92 E0
+G92 E0
+G1 F1800 E-1.3
+;LAYER_COUNT:83
+;LAYER:0
+M106 S255
+G0 F3000 X14 Y9.314 Z0.2"""
+
+class TestGX(unittest.TestCase):
+
+    def test_from_gcode(self):
+        gx = GX.from_gcode(test_gcode)
+        result = gx.encode().decode('latin1')
+        print("Resulting gcode: ", result)
+        self.assertFalse(' S195.0 ' in result)
+        self.assertTrue(' S195 ' in result)
+        self.assertTrue('xgcode' in result)
+
+if __name__ == '__main__':
+    unittest.main()