App: Use ProjectConf

Refactor App to use the new ProjectConf module for parsing make/project.conf files.
This commit
  - removes the inline ad-hoc read_value() method and its nested
    helper functions, replacing them with ProjectConf's
    get_str_or_none() API.
  - introduces two cached helper methods (__read_project_conf() and
    __get_project_conf()) to read and cache ProjectConf instances per
    project.
  - updates get_value() to delegate to ProjectConf and moves the
    proj_dir lookup to only run in the version branch where it is
    needed.
  - updates the topdir init to use __read_project_conf() with a
    FileNotFoundError catch for optional config files.
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/App.py

@@ -16,6 +16,7 @@ from typing import TYPE_CHECKING
 from .lib.App import App as Base
 from .lib.Distro import Distro
 from .lib.log import DEBUG, ERR, log
+from .lib.ProjectConf import ProjectConf
 
 if TYPE_CHECKING:
     import argparse
@@ -180,6 +181,17 @@ class App(Base):
                 return ret
         return None
 
+    @cache
+    def __read_project_conf(self, project_dir: str) -> ProjectConf:
+        return ProjectConf.read(project_dir + '/make/project.conf')
+
+    @cache
+    def __get_project_conf(self, project: str) -> ProjectConf:
+        pd = self.__proj_dir(project, False)
+        if pd is None:
+            raise Exception(f'Failed to find directory of project {project}')
+        return self.__read_project_conf(pd)
+
     def __get_project_refs_cached(
         self, buf, visited, spec, section, key, add_self, scope, names_only
     ):
@@ -405,9 +417,11 @@ class App(Base):
         self.___pretty_topdir = self.__format_topdir(self.___topdir, args.topdir_format)
         self.__topdir_fmt = args.topdir_format
         if self.___topdir is not None:
-            self.__top_name = self.read_value(
-                self.___topdir + '/make/project.conf', 'build', 'name'
-            )
+            try:
+                conf = self.__read_project_conf(self.__topdir)
+                self.__top_name = conf.get_str_or_none('build', 'name')
+            except FileNotFoundError:
+                pass
             if not self.__top_name:
                 self.__top_name = re.sub(
                     '-[0-9.-]*$',
@@ -529,66 +543,13 @@ class App(Base):
         file.close()
         return ret.rstrip()
 
-    @cache
-    def read_value(self, path: str, section: str, key: str) -> str | None:
-
-        def scan_section(f, key: str) -> str | None:
-            if key is None:
-                ret = ''
-                for line in f:
-                    if len(line) and line[0] == '[':
-                        break
-                    ret += line
-                return ret if len(ret) else None
-            lines: list[str] = []
-            cont_line = ''
-            for line in f:
-                if len(line) and line[0] == '[':
-                    break
-                cont_line += line.rstrip()
-                if len(cont_line) and cont_line[-1] == '\\':
-                    cont_line = cont_line[0:-1]
-                    continue
-                lines.append(cont_line)
-                cont_line = ''
-            rx = re.compile(r'^\s*' + key + r'\s*=\s*(.*)\s*$')
-            for line in lines:
-                # log(DEBUG, '  looking for "%s" in line="%s"' % (key, line))
-                m = re.search(rx, line)
-                if m is not None:
-                    return m.group(1)
-            return None
-
-        def scan_section_debug(f, key: str) -> str | None:
-            ret = scan_section(f, key)
-            # log(DEBUG, '  returning', rr)
-            return ret
-
-        try:
-            # log(DEBUG, 'looking for {}::[{}].{}'.format(path, section, key))
-            # TODO: Parse
-            with open(path, 'r') as f:
-                if not len(section):
-                    return scan_section(f, key)
-                pat = '[' + section + ']'
-                for line in f:
-                    if line.rstrip() == pat:
-                        return scan_section(f, key)
-                return None
-        except Exception:
-            log(DEBUG, f'Not found: {path}')
-            # TODO: handle this special case cleaner somewhere up the stack
-            if section == 'build' and key == 'libname':
-                return 'none'
-            return None
-
     @cache
     def get_value(self, project: str, section: str, key: str) -> str | None:
         ret: str | None
-        proj_dir = self.__proj_dir(project, pretty = False)
-        if proj_dir is None:
-            raise Exception(f"Can't get project directory for {project}")
         if section == 'version':
+            proj_dir = self.__proj_dir(project, pretty = False)
+            if proj_dir is None:
+                raise Exception(f"Can't get project directory for {project}")
             proj_version_dirs = [proj_dir]
             if proj_dir != self.___topdir:
                 proj_version_dirs.append('/usr/share/doc/packages/' + project)
@@ -603,8 +564,7 @@ class App(Base):
                     log(DEBUG, f'Ignoring unreadable file "{version_path}"')
                     continue
             raise Exception(f'No version file found for project "{project}"')
-        path = proj_dir + '/make/project.conf'
-        ret = self.read_value(path, section, key)
+        ret = self.__get_project_conf(project).get_str_or_none(section, key)
         log(
             DEBUG,
             'Lookup %s -> %s / [%s%s] -> "%s"' %