Add detection for pipx installation method in update messages

src/sinol_make/__init__.py

@@ -109,16 +109,17 @@ def main():
                              'https://github.com/sio2project/sinol-make/#reporting-bugs-and-contributing-code')
     finally:
         if new_version is not None:
+            install_method = 'pipx' if util.is_probably_installed_by_pipx() else 'pip'
             if not util.is_dev(new_version):
                 print(util.warning(
                     f'New version of sinol-make is available (your version: {__version__}, available version: '
                     f'{new_version}).\n'
                     f'Changelog can be found at https://github.com/sio2project/sinol-make/releases.\n'
-                    f'You can update sinol-make by running `pip install sinol-make --upgrade`.'))
+                    f'You can update sinol-make by running `{install_method} install sinol-make --upgrade`.'))
             elif util.is_dev(new_version):
                 print(util.warning(
                     f'New development version of sinol-make is available (your version: {__version__}, available '
                     f'version: {new_version}).\n'
                     f'Changelog can be found at https://github.com/sio2project/sinol-make/releases.\n'
-                    f'You can update sinol-make by running `pip install sinol-make --pre --upgrade`.'
+                    f'You can update sinol-make by running `{install_method} install sinol-make --pre --upgrade`.'
                 ))

src/sinol_make/util.py

@@ -431,3 +431,18 @@ def exit_with_error(text, func=None):
 
 def has_sanitizer_error(output, exit_code):
     return ('ELF_ET_DYN_BASE' in output or 'ASan' in output) and exit_code != 0
+
+
+def is_running_in_virtualenv():
+    return (
+        hasattr(sys, 'real_prefix') or
+        (hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix)
+    )
+
+def is_probably_installed_by_pipx():
+    if not is_running_in_virtualenv():
+        return False
+
+    # Pipx installs into ~/.local/pipx/venvs/
+    venv_path = sys.prefix
+    return 'pipx' in venv_path or 'pipx' in os.path.abspath(venv_path)