Reduce dependence on external libraries

Author: hongquan

README.rst

@@ -23,9 +23,9 @@ This utility targets modern Python projects which have layout generated by `Poet
 
 This duplicity often leads to inconsistency when you, the author, forget to update both.
 
-*single-version* is born to solve that headache circumstance. By convention, it chooses the *pyproject.toml* file as original source of version string. Your project's ``__version__`` variable then is computed from it. When your package is already deployed and installed to some system, the version string will be retrieved from that Python environment (the *pyproject.toml* is not included in distribution file).
+*single-version* was born to solve that headache circumstance. By convention, it chooses the *pyproject.toml* file as original source of version string. Your project's ``__version__`` variable then is computed from it. When your package is already deployed and installed to some system, the version string will be retrieved from that Python environment (the *pyproject.toml* is not included in distribution file).
 
-Years ago, to retrieve version for an installed package, ones often used `pkg_resources`_, which has well-known issue of causing slow import. Learning from that mistake, *single-version* use |importlib.metadata|_, which becomes standard from Python 3.8, instead.
+Years ago, to retrieve version for an installed package, people often used `pkg_resources`_, which has well-known issue of causing slow import. Learning from that mistake, *single-version* use |importlib.metadata|_, which becomes standard from Python 3.8, instead.
 
 
 Usage

poetry.lock

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "single-version"
-version = "1.4.1"
+version = "1.5"
 description = "Small utility to define version string for Poetry-style Python project."
 authors = ["Nguyễn Hồng Quân <ng.hong.quan@gmail.com>"]
 maintainers = [
@@ -19,7 +19,6 @@ classifiers = [
 [tool.poetry.dependencies]
 python = "^3.6"
 importlib_metadata = { version = "^2.0", python = "< 3.8" }
-first = "^2.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.2"

pyproject.toml

@@ -2,13 +2,12 @@
 import sys
 from pathlib import Path
 
-from first import first
-
 
 __all__ = ('get_version',)
 
 
 _REGEX_VERSION = re.compile(r'\s*version\s*=\s*["\']([.0-9a-z-+]+)["\']\s*$')
+FALLBACK_VERSION = '0.0.0'
 
 pyver = sys.version_info[:2]
 if pyver <= (3, 7):
@@ -33,12 +32,13 @@ def get_version(package_name: str, looked_path: Path) -> str:
     # so, if we see that file, its mean that the package is imported from development folder.
     filepath = looked_path / 'pyproject.toml'    # type: Path
     if filepath.exists():
-        found = first(_REGEX_VERSION.match(line) for line in filepath.open())
-        if not found:
-            return '0.0'
-        return found.group(1)
+        for line in filepath.open():
+            found = _REGEX_VERSION.match(line)
+            if found:
+                return found.group(1)
+        return FALLBACK_VERSION
     try:
         return importlib_metadata.version(package_name)
     except importlib_metadata.PackageNotFoundError:
         pass
-    return '0.0'
+    return FALLBACK_VERSION

single_version/ver.py

@@ -3,7 +3,7 @@
 
 
 def test_version():
-    assert __version__ == '1.4.1'
+    assert __version__ == '1.5'
 
 
 def test_version_regex():