ask 'did you mean?' for a missing frappy cfg

frappy.py

@@ -2,6 +2,7 @@ import re
 import os
 from socket import gethostname, gethostbyname
 from pathlib import Path
+from difflib import SequenceMatcher
 from .base import MarcheControl, Logger, ArgError, write_content, Config
 from .normalizeuri import normalizeuri
 
@@ -13,6 +14,26 @@ overrideNode(interface=interface)
 WRAPPER_PAT = re.compile(r"interface\s=\s*'(\d*)'\s*\n")
 
 
+class NotFound(FileNotFoundError):
+    pass
+
+def best_guesses(target, names, max_results=5, case_penalty=0.05):
+    """find best matches, case insensitive"""
+    target_l = target.lower()
+    # invert score instead of reverse -> this will sort names with same score alphabetically
+    scored = sorted(((1-SequenceMatcher(None, target_l, name.lower()).ratio(), name)
+                     for name in names))
+    scorelimit = scored[0][0] + 0.1
+    result = []
+    for i, (score, name) in enumerate(scored):
+        if score > scorelimit:
+             break
+        if i > 1:  #
+            scorelimit = score + 0.01
+        result.append(name)
+    return result
+
+
 class FrappyConfig(Config):
     log = None
     process_file = None
@@ -27,7 +48,7 @@ class FrappyConfig(Config):
         self.wrapperdir = superconfig.get('wrapperdir')
         if not Path(self.wrapperdir).is_dir():
             raise ValueError(f'{self.wrapperdir} does not exist')
-        self.cfgdirs = superconfig.get('cfgdirs')
+        self.cfgdirs = superconfig.get('cfgdirs').replace('<INS>', instrument)
         if self.ins_config:
             frappy_ports = self.ins_config.get('frappy_ports', '0')
             ports = frappy_ports.split('-')
@@ -84,14 +105,23 @@ class FrappyControl(MarcheControl):
         services = [service] if service else list(self.services)
         services.append('')
         cfgdirs = cfgdirs or self.config.cfgdirs
+        allcfg = []
 
         for servicedir in services:
             for cfgdir in cfgdirs.split(':'):
                 cfgfile = Path(cfgdir) / servicedir / cfgpy
-                tries.append(cfgfile)
+                tries.append(str(cfgfile))
                 if cfgfile.is_file():
                     return servicedir, cfgfile
         else:
+            names = set()
+            for servicedir in services:
+                for cfgdir in cfgdirs.split(':'):
+                    names.update((f.stem[:-4] for f in (Path(cfgdir) / servicedir).glob('*_cfg.py')))
+            guesses = best_guesses(cfg, names)
+            if guesses:
+                suggest = '/'.join(guesses)
+                raise NotFound(f'{cfg} not found, do you mean {suggest}')
             raise FileNotFoundError(f'can not find {cfgpy} in {tries}')
 
     def get_std_port(self, service):