Add bash completion script for sleepycli

scripts/sleepycli-completion.bash

@@ -0,0 +1,64 @@
+_sleepycli_completion() {
+    local cur prev=""
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    if (( COMP_CWORD > 0 )); then
+        prev="${COMP_WORDS[COMP_CWORD-1]}"
+    fi
+
+    local mode_flags="--now --wake --sleep --from --to"
+    local option_flags="--buffer --cycles-min --cycles-max"
+    local misc_flags="--good-night --version --help"
+
+    local has_now=0
+    local has_wake=0
+    local has_sleep=0
+    local has_from=0
+    local has_to=0
+    local has_misc=0
+
+    local word
+    for word in "${COMP_WORDS[@]:1:COMP_CWORD-1}"; do
+        case "$word" in
+            --now) has_now=1 ;;
+            --wake) has_wake=1 ;;
+            --sleep) has_sleep=1 ;;
+            --from) has_from=1 ;;
+            --to) has_to=1 ;;
+            --good-night|--version|--help) has_misc=1 ;;
+        esac
+    done
+
+    case "$prev" in
+        --wake|--sleep|--from|--to|--buffer|--cycles-min|--cycles-max)
+            if [[ "$cur" != -* ]]; then
+                COMPREPLY=()
+                return
+            fi
+            ;;
+    esac
+
+    if (( has_misc == 1 )); then
+        COMPREPLY=()
+        return
+    fi
+
+    local suggestions=""
+
+    if (( has_now == 0 )) && (( has_wake == 0 )) && (( has_sleep == 0 )) && (( has_from == 0 )) && (( has_to == 0 )); then
+        suggestions="$mode_flags $misc_flags"
+    elif (( has_now == 1 )) || (( has_wake == 1 )) || (( has_sleep == 1 )); then
+        suggestions="$option_flags"
+    else
+        if (( has_from == 1 )) && (( has_to == 0 )); then
+            suggestions="--to"
+        elif (( has_to == 1 )) && (( has_from == 0 )); then
+            suggestions="--from"
+        else
+            suggestions="$option_flags"
+        fi
+    fi
+
+    COMPREPLY=( $(compgen -W "$suggestions" -- "$cur") )
+}
+
+complete -F _sleepycli_completion sleepycli