add shell completion scripts

add Shell Completion section to README

add pdm script completion

add pre-commit config

completions/_slobs-cli.bash

@@ -0,0 +1,28 @@
+_slobs_cli_completion() {
+    local IFS=$'\n'
+    local response
+
+    response=$(env COMP_WORDS="${COMP_WORDS[*]}" COMP_CWORD=$COMP_CWORD _SLOBS_CLI_COMPLETE=bash_complete $1)
+
+    for completion in $response; do
+        IFS=',' read type value <<< "$completion"
+
+        if [[ $type == 'dir' ]]; then
+            COMPREPLY=()
+            compopt -o dirnames
+        elif [[ $type == 'file' ]]; then
+            COMPREPLY=()
+            compopt -o default
+        elif [[ $type == 'plain' ]]; then
+            COMPREPLY+=($value)
+        fi
+    done
+
+    return 0
+}
+
+_slobs_cli_completion_setup() {
+    complete -o nosort -F _slobs_cli_completion slobs-cli
+}
+
+_slobs_cli_completion_setup;

completions/_slobs-cli.fish

@@ -0,0 +1,17 @@
+function _slobs_cli_completion;
+    set -l response (env _SLOBS_CLI_COMPLETE=fish_complete COMP_WORDS=(commandline -cp) COMP_CWORD=(commandline -t) slobs-cli);
+
+    for completion in $response;
+        set -l metadata (string split "," $completion);
+
+        if test $metadata[1] = "dir";
+            __fish_complete_directories $metadata[2];
+        else if test $metadata[1] = "file";
+            __fish_complete_path $metadata[2];
+        else if test $metadata[1] = "plain";
+            echo $metadata[2];
+        end;
+    end;
+end;
+
+complete --no-files --command slobs-cli --arguments "(_slobs_cli_completion)";

completions/_slobs-cli.zsh

@@ -0,0 +1,40 @@
+#compdef slobs-cli
+
+_slobs_cli_completion() {
+    local -a completions
+    local -a completions_with_descriptions
+    local -a response
+    (( ! $+commands[slobs-cli] )) && return 1
+
+    response=("${(@f)$(env COMP_WORDS="${words[*]}" COMP_CWORD=$((CURRENT-1)) _SLOBS_CLI_COMPLETE=zsh_complete slobs-cli)}")
+
+    for type key descr in ${response}; do
+        if [[ "$type" == "plain" ]]; then
+            if [[ "$descr" == "_" ]]; then
+                completions+=("$key")
+            else
+                completions_with_descriptions+=("$key":"$descr")
+            fi
+        elif [[ "$type" == "dir" ]]; then
+            _path_files -/
+        elif [[ "$type" == "file" ]]; then
+            _path_files -f
+        fi
+    done
+
+    if [ -n "$completions_with_descriptions" ]; then
+        _describe -V unsorted completions_with_descriptions -U
+    fi
+
+    if [ -n "$completions" ]; then
+        compadd -U -V unsorted -a completions
+    fi
+}
+
+if [[ $zsh_eval_context[-1] == loadautofunc ]]; then
+    # autoload from fpath, call function directly
+    _slobs_cli_completion "$@"
+else
+    # eval/source/. command, register function for later
+    compdef _slobs_cli_completion slobs-cli
+fi