Switch to shtab for shell completion (#135)

Co-authored-by: Matthew Peveler <matt.peveler@gmail.com>

Author: casperdcl

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
 
     - name: Install developer dependencies
       run: |
-        python3 -m pip install -U pip
+        python3 -m pip install -U pip setuptools
         python3 -m pip install -U pytest pytest-runner flake8
 
     - name: Install sphinx dependencies

README.md

@@ -90,7 +90,16 @@ If you are experiencing issues with *tldr*, consider deleting the cache files be
 
 #### Autocomplete
 
-`argcomplete` is required for autocompletion. See the `argcomplete` [docs](https://pypi.org/project/argcomplete/) for how to enable `argcomplete`. Cache will also need to be enabled and downloaded.
+`shtab` is required for autocompletion using the `--print-completion` argument.
+
+```bash
+# bash
+tldr --print-completion bash | sudo tee "$BASH_COMPLETION_COMPAT_DIR"/tldr
+# zsh
+tldr --print-completion zsh | sudo tee /usr/local/share/zsh/site-functions/_tldr
+```
+
+See the `shtab` [docs](https://pypi.org/project/shtab/#usage) for other installation methods.
 
 ### SSL Inspection
 

requirements.txt

@@ -1,3 +1,3 @@
 termcolor
 colorama
-argcomplete
+shtab>=1.3.10

tldr.py

@@ -14,7 +14,7 @@
 from urllib.error import HTTPError, URLError
 from termcolor import colored
 import colorama  # Required for Windows
-import argcomplete
+import shtab
 
 __version__ = "2.0.0"
 __client_specification__ = "1.4"
@@ -435,15 +435,23 @@ def create_parser():
 
     parser.add_argument(
         'command', type=str, nargs='*', help="command to lookup", metavar='command'
-    ).completer = argcomplete.completers.ChoicesCompleter(get_commands())
+    ).complete = {"bash": "shtab_tldr_cmd_list", "zsh": "shtab_tldr_cmd_list"}
+
+    shtab.add_argument_to(parser, preamble={
+        'bash': r'''shtab_tldr_cmd_list(){{
+          compgen -W "$("{py}" -m tldr --list | sed 's/\W/ /g')" -- "$1"
+        }}'''.format(py=sys.executable),
+        'zsh': r'''shtab_tldr_cmd_list(){{
+          _describe 'command' "($("{py}" -m tldr --list | sed 's/\W/ /g'))"
+        }}'''.format(py=sys.executable)
+    })
 
     return parser
 
 
 def main():
     parser = create_parser()
 
-    argcomplete.autocomplete(parser)
     options = parser.parse_args()
 
     colorama.init(strip=options.color)