Support for CLI command completions

Dockerfile

@@ -44,6 +44,7 @@ COPY tests /Annif/tests
 RUN poetry install -E "$optional_dependencies"
 
 WORKDIR /annif-projects
+RUN annif completion --bash >> /etc/bash.bashrc  # Enable tab completion
 
 # Switch user to non-root:
 RUN groupadd -g 998 annif_user && \

README.md

@@ -46,6 +46,29 @@ Start up the application:
 See [Getting Started](https://github.com/NatLibFi/Annif/wiki/Getting-started)
 in the wiki for more details.
 
+## Shell compeletions
+Annif supports tab-key completion in bash, zsh and fish shells for commands and options
+and project id, vocabulary id and path parameters.
+
+To enable the completion support in your current terminal session use `annif completion`
+command with the option according to your shell to produce the completion script and
+source it. For example, run
+
+    source <(annif completion --bash)
+
+To enable the completion support in all new sessions first add the completion script in
+your home directory:
+
+    annif completion --bash > ~/.annif-complete.bash
+
+Then make the script to be automatically sourced for new terminal sessions by adding the
+following to your `~/.bashrc` file (or in some [alternative startup
+file](https://www.gnu.org/software/bash/manual/html_node/Bash-Startup-Files.html)):
+
+    source ~/.annif-complete.bash
+
+For details and usage for other shells see
+[Click documentation](https://click.palletsprojects.com/en/8.1.x/shell-completion/).
 # Docker install
 
 You can use Annif as a pre-built Docker container. Please see the

annif/cli.py

@@ -3,6 +3,7 @@
 
 
 import collections
+import importlib
 import json
 import os.path
 import re
@@ -56,7 +57,7 @@ def run_list_projects():
 
 
 @cli.command("show-project")
-@click.argument("project_id")
+@cli_util.project_id
 @cli_util.common_options
 def run_show_project(project_id):
     """
@@ -75,7 +76,7 @@ def run_show_project(project_id):
 
 
 @cli.command("clear")
-@click.argument("project_id")
+@cli_util.project_id
 @cli_util.common_options
 def run_clear_project(project_id):
     """
@@ -110,7 +111,7 @@ def run_list_vocabs():
 
 
 @cli.command("load-vocab")
-@click.argument("vocab_id")
+@click.argument("vocab_id", shell_complete=cli_util.complete_param)
 @click.argument("subjectfile", type=click.Path(exists=True, dir_okay=False))
 @click.option("--language", "-L", help="Language of subject file")
 @click.option(
@@ -148,7 +149,7 @@ def run_load_vocab(vocab_id, language, force, subjectfile):
 
 
 @cli.command("train")
-@click.argument("project_id")
+@cli_util.project_id
 @click.argument("paths", type=click.Path(exists=True), nargs=-1)
 @click.option(
     "--cached/--no-cached",
@@ -192,7 +193,7 @@ def run_train(project_id, paths, cached, docs_limit, jobs, backend_param):
 
 
 @cli.command("learn")
-@click.argument("project_id")
+@cli_util.project_id
 @click.argument("paths", type=click.Path(exists=True), nargs=-1)
 @cli_util.docs_limit_option
 @cli_util.backend_param_option
@@ -214,7 +215,7 @@ def run_learn(project_id, paths, docs_limit, backend_param):
 
 
 @cli.command("suggest")
-@click.argument("project_id")
+@cli_util.project_id
 @click.argument(
     "paths", type=click.Path(dir_okay=False, exists=True, allow_dash=True), nargs=-1
 )
@@ -258,7 +259,7 @@ def run_suggest(
 
 
 @cli.command("index")
-@click.argument("project_id")
+@cli_util.project_id
 @click.argument("directory", type=click.Path(exists=True, file_okay=False))
 @click.option(
     "--suffix", "-s", default=".annif", help="File name suffix for result files"
@@ -305,7 +306,7 @@ def run_index(
 
 
 @cli.command("eval")
-@click.argument("project_id")
+@cli_util.project_id
 @click.argument("paths", type=click.Path(exists=True), nargs=-1)
 @click.option("--limit", "-l", default=10, help="Maximum number of subjects")
 @click.option("--threshold", "-t", default=0.0, help="Minimum score threshold")
@@ -416,7 +417,7 @@ def run_eval(
 
 
 @cli.command("optimize")
-@click.argument("project_id")
+@cli_util.project_id
 @click.argument("paths", type=click.Path(exists=True), nargs=-1)
 @click.option(
     "--jobs", "-j", default=1, help="Number of parallel jobs (0 means all CPUs)"
@@ -514,7 +515,7 @@ def run_optimize(project_id, paths, jobs, docs_limit, backend_param):
 
 
 @cli.command("hyperopt")
-@click.argument("project_id")
+@cli_util.project_id
 @click.argument("paths", type=click.Path(exists=True), nargs=-1)
 @click.option("--trials", "-T", default=10, help="Number of trials")
 @click.option(
@@ -551,5 +552,23 @@ def run_hyperopt(project_id, paths, docs_limit, trials, jobs, metric, results_fi
     click.echo("---")
 
 
+@cli.command("completion")
+@click.option("--bash", "shell", flag_value="bash")
+@click.option("--zsh", "shell", flag_value="zsh")
+@click.option("--fish", "shell", flag_value="fish")
+def completion(shell):
+    """Generate the script for tab-key autocompletion for the given shell. To enable the
+    completion support in your current bash terminal session run\n
+        source <(annif completion --bash)
+    """
+
+    if shell is None:
+        raise click.UsageError("Shell not given, try --bash, --zsh or --fish")
+
+    script = os.popen(f"_ANNIF_COMPLETE={shell}_source annif").read()
+    click.echo(f"# Generated by Annif {importlib.metadata.version('annif')}")
+    click.echo(script)
+
+
 if __name__ == "__main__":
     cli()

annif/cli_util.py

@@ -38,6 +38,11 @@ def common_options(f):
     return click_log.simple_verbosity_option(logger)(f)
 
 
+def project_id(f):
+    """Decorator to add a project ID parameter to a CLI command"""
+    return click.argument("project_id", shell_complete=complete_param)(f)
+
+
 def backend_param_option(f):
     """Decorator to add an option for CLI commands to override BE parameters"""
     return click.option(
@@ -170,3 +175,21 @@ def generate_filter_params(filter_batch_max_limit):
     limits = range(1, filter_batch_max_limit + 1)
     thresholds = [i * 0.05 for i in range(20)]
     return list(itertools.product(limits, thresholds))
+
+
+def _get_completion_choices(param):
+    if param.name == "project_id":
+        return annif.registry.get_projects()
+    elif param.name == "vocab_id":
+        return annif.registry.get_vocabs()
+    else:
+        return []
+
+
+def complete_param(ctx, param, incomplete):
+    with ctx.obj.load_app().app_context():
+        return [
+            choice
+            for choice in _get_completion_choices(param)
+            if choice.startswith(incomplete)
+        ]

docs/source/commands.rst

@@ -12,6 +12,11 @@ setting a (non-default) path to a `project configuration file
 <https://github.com/NatLibFi/Annif/wiki/Project-configuration>`_ and
 ``--verbosity`` for selecting logging level.
 
+Annif supports tab-key completion in bash, zsh and fish shells for commands and options
+and project id, vocabulary id and path parameters. See `README.md
+<https://github.com/NatLibFi/Annif#shell-completions>`_ for instructions on how to
+enable the support.
+
 .. contents::
    :local:
    :backlinks: none

tests/test_cli.py

@@ -7,7 +7,9 @@
 import random
 import re
 import shutil
+from unittest import mock
 
+from click.shell_completion import ShellComplete
 from click.testing import CliRunner
 
 import annif.cli
@@ -1005,3 +1007,76 @@ def test_version_option():
     assert result.exit_code == 0
     version = importlib.metadata.version("annif")
     assert result.output.strip() == version.strip()
+
+
+def test_completion_script_generation():
+    result = runner.invoke(annif.cli.cli, ["completion", "--bash"])
+    assert not result.exception
+    assert result.exit_code == 0
+    assert "# Generated by Annif " in result.output
+
+
+def test_completion_script_generation_shell_not_given():
+    failed_result = runner.invoke(annif.cli.cli, ["completion"])
+    assert failed_result.exception
+    assert failed_result.exit_code != 0
+    assert "Shell not given" in failed_result.output
+
+
+def get_completions(cli, args, incomplete):
+    completer = ShellComplete(cli, {}, cli.name, "_ANNIF_COMPLETE")
+    completions = completer.get_completions(args, incomplete)
+    return [c.value for c in completions]
+
+
+def test_completion_list_commands():
+    completions = get_completions(annif.cli.cli, [""], "list")
+    assert completions == ["list-projects", "list-vocabs"]
+
+
+def test_completion_version_option():
+    completions = get_completions(annif.cli.cli, [""], "--ver")
+    assert completions == ["--version"]
+
+
+@mock.patch.dict(os.environ, {"ANNIF_CONFIG": "annif.default_config.TestingConfig"})
+def test_completion_show_project_project_ids_all():
+    completions = get_completions(annif.cli.cli, ["show-project"], "")
+    assert completions == [
+        "dummy-fi",
+        "dummy-en",
+        "dummy-private",
+        "dummy-vocablang",
+        "dummy-transform",
+        "limit-transform",
+        "ensemble",
+        "noanalyzer",
+        "novocab",
+        "nobackend",
+        "noname",
+        "noparams-tfidf-fi",
+        "noparams-fasttext-fi",
+        "pav",
+        "tfidf-fi",
+        "tfidf-en",
+        "fasttext-en",
+        "fasttext-fi",
+    ]
+
+
+@mock.patch.dict(os.environ, {"ANNIF_CONFIG": "annif.default_config.TestingConfig"})
+def test_completion_show_project_project_ids_dummy():
+    completions = get_completions(annif.cli.cli, ["show-project"], "dummy")
+    assert completions == [
+        "dummy-fi",
+        "dummy-en",
+        "dummy-private",
+        "dummy-vocablang",
+        "dummy-transform",
+    ]
+
+
+@mock.patch.dict(os.environ, {"ANNIF_CONFIG": "annif.default_config.TestingConfig"})
+def test_completion_load_vocab_vocab_ids_all():
+    completions = get_completions(annif.cli.cli, ["load-vocab"], "")
+    assert completions == ["dummy", "dummy-noname", "yso"]