Support XDG base directory specification

https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

test/test_unit_configure_paths.py

@@ -8,7 +8,7 @@ CONFIG = 'config'
 ENCRYPT = 'encrypt'
 HOME = '/testhome'
 REPO = 'repo.git'
-YDIR = '.yadm'
+YDIR = '.config/yadm'
 
 
 @pytest.mark.parametrize(
@@ -70,6 +70,7 @@ def run_test(runner, paths, args, expected_matches, expected_code=0):
     script = f"""
         YADM_TEST=1 HOME="{HOME}" source {paths.pgm}
         process_global_args {argstring}
+        HOME="{HOME}" set_yadm_dir
         configure_paths
         declare -p | grep -E '(YADM|GIT)_'
     """

test/test_unit_issue_legacy_path_warning.py

@@ -0,0 +1,34 @@
+"""Unit tests: issue_legacy_path_warning"""
+import pytest
+
+
+@pytest.mark.parametrize(
+    'legacy_path', [
+        None,
+        'repo.git',
+        'config',
+        'encrypt',
+        'files.gpg',
+        'bootstrap',
+        'hooks',
+        ],
+    )
+def test_legacy_warning(tmpdir, runner, yadm, legacy_path):
+    """Use issue_legacy_path_warning"""
+    home = tmpdir.mkdir('home')
+
+    if legacy_path:
+        home.mkdir(f'.yadm').mkdir(legacy_path)
+
+    script = f"""
+        HOME={home}
+        YADM_TEST=1 source {yadm}
+        issue_legacy_path_warning
+    """
+    run = runner(command=['bash'], inp=script)
+    assert run.success
+    assert run.err == ''
+    if legacy_path:
+        assert 'Legacy configuration paths have been detected' in run.out
+    else:
+        assert run.out.rstrip() == ''

test/test_unit_set_yadm_dir.py

@@ -0,0 +1,35 @@
+"""Unit tests: set_yadm_dir"""
+import pytest
+
+
+@pytest.mark.parametrize(
+    'condition',
+    ['basic', 'override', 'xdg_config_home', 'legacy'],
+    )
+def test_set_yadm_dir(runner, yadm, condition):
+    """Test set_yadm_dir"""
+    setup = ''
+    if condition == 'override':
+        setup = 'YADM_DIR=/override'
+    elif condition == 'xdg_config_home':
+        setup = 'XDG_CONFIG_HOME=/xdg'
+    elif condition == 'legacy':
+        setup = 'YADM_COMPATIBILITY=1'
+    script = f"""
+        HOME=/testhome
+        YADM_TEST=1 source {yadm}
+        {setup}
+        set_yadm_dir
+        echo "$YADM_DIR"
+    """
+    run = runner(command=['bash'], inp=script)
+    assert run.success
+    assert run.err == ''
+    if condition == 'basic':
+        assert run.out.rstrip() == '/testhome/.config/yadm'
+    elif condition == 'override':
+        assert run.out.rstrip() == '/override'
+    elif condition == 'xdg_config_home':
+        assert run.out.rstrip() == '/xdg/yadm'
+    elif condition == 'legacy':
+        assert run.out.rstrip() == '/testhome/.yadm'