From 876c2d271a84693da15ef0678b456b758c8ad8fe Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <rekado@elephly.net>
Date: Tue, 30 Apr 2024 10:03:38 +0200
Subject: Fill metadata from the Faust source file.

---
 faust-ksoloti-object.c |  8 ++++----
 faust2axo.py           | 55 +++++++++++++++++++++++++++++++++++---------------
 2 files changed, 43 insertions(+), 20 deletions(-)

diff --git a/faust-ksoloti-object.c b/faust-ksoloti-object.c
index 97128fe..8524906 100644
--- a/faust-ksoloti-object.c
+++ b/faust-ksoloti-object.c
@@ -1,8 +1,8 @@
 <objdefs>
-  <obj.normal id="moog_vcf_2b" uuid="0009f089dced01ba64f7e22ac77fd78fbec47db9" sha="000d84e43d5934e94f32e1d50318f8feede69769">
-    <sDescription>Moog VCF (moog_vcf_2b)</sDescription>
-    <author>Ricardo Wurmus (Ksoloti), Julius O. Smith III (Faust)</author>
-    <license>STK-4.3</license>
+  <obj.normal id="<<NAME>>" uuid="<<UUID>>" sha="000d84e43d5934e94f32e1d50318f8feede69769">
+    <sDescription><<DESCRIPTION>></sDescription>
+    <author><<AUTHOR>></author>
+    <license><<LICENSE>></license>
     <helpPatch/>
     <includes>
       <include>math.h</include>
diff --git a/faust2axo.py b/faust2axo.py
index 7a65001..c37a507 100755
--- a/faust2axo.py
+++ b/faust2axo.py
@@ -3,6 +3,7 @@
 import sys
 import argparse
 import subprocess
+import uuid
 import xml.etree.ElementTree as ET
 
 
@@ -45,18 +46,28 @@ def process_sliders(xml):
         else:
             param_type = "frac32.s.map"
 
-        inlets += f"<frac32 name=\"{label}\" />\n"
-        params += f"<{param_type} name=\"{label}\" />\n"
+        inlets += f'<frac32 name="{label}" />\n'
+        params += f'<{param_type} name="{label}" />\n'
 
         # TODO: summation and conversion based on type
         if pitch:
-            output += f"uint32_t {label} = mtof48k_ext_q31(param_{label} + inlet_{label});\n"
+            output += (
+                f"uint32_t {label} = mtof48k_ext_q31(param_{label} + inlet_{label});\n"
+            )
         else:
             output += f"uint32_t {label} = param_{label} + inlet_{label};\n"
         output += f"mdsp.{varname} = fminf(1.0f, q27_to_float({label})) * {max};\n"
     return (inlets, params, output)
 
 
+def safe_extract_text(xml, xpath, alternative):
+    result = xml.find(xpath)
+    if isinstance(result, ET.Element):
+        return result.text
+    else:
+        return alternative
+
+
 def massage_output(oldfile, newfile, xml):
     """
     Process the Faust output.
@@ -65,15 +76,35 @@ def massage_output(oldfile, newfile, xml):
     # - throw everything before <objdefs> away
     # - throw everything after </objdefs> away
     # - remove extern "C" chunk (wrapped in "#ifdef __cplusplus")
+    # - inject params and inlets
     # - replace scaling factors for sliders
     # - replace metadata
 
+    id = uuid.uuid4()
+    author = safe_extract_text(xml, "./author", "unknown")
+    name = safe_extract_text(xml, "./name", "unnamed")
+    license = safe_extract_text(xml, "./license", "CC-SA 4.0")
+    description = safe_extract_text(
+        xml, "./description", "Generated from Faust DSP code."
+    )
+
     inlets, params, conversions = process_sliders(xml)
-    
+
     seen_start = False
     seen_end = False
     skip_ifdef = False
 
+    replacements = {
+        "UUID": str(id),
+        "AUTHOR": author,
+        "NAME": name,
+        "LICENSE": license,
+        "DESCRIPTION": description,
+        "INLETS": inlets,
+        "PARAMS": params,
+        "SLIDERS": conversions,
+    }
+
     with open(oldfile, "r", encoding="utf-8") as infile, open(
         newfile, "w", encoding="utf-8"
     ) as outfile:
@@ -87,18 +118,6 @@ def massage_output(oldfile, newfile, xml):
                 return
 
             if seen_start:
-                if "<<INLETS>>" in line:
-                    outfile.write(line.replace("<<INLETS>>", inlets))
-                    continue
-
-                if "<<PARAMS>>" in line:
-                    outfile.write(line.replace("<<PARAMS>>", params))
-                    continue
-
-                if "<<SLIDERS>>" in line:
-                    outfile.write(line.replace("<<SLIDERS>>", conversions))
-                    continue
-
                 if line.startswith("#ifdef __cplusplus"):
                     skip_ifdef = True
 
@@ -107,6 +126,10 @@ def massage_output(oldfile, newfile, xml):
                         skip_ifdef = False
                     continue
 
+                for key, value in replacements.items():
+                    if "<<" + key + ">>" in line:
+                        line = line.replace("<<" + key + ">>", value)
+
                 outfile.write(line)
             else:
                 continue
-- 
cgit v1.2.3