add rudimentary bash completion

1 files changed, 92 insertions, 0 deletions

diff --git a/bash-completion b/bash-completion
new file mode 100644
index 0000000..c6040fc
--- /dev/null
+++ b/bash-completion
@@ -0,0 +1,92 @@
+#!/bin/bash
+
+in_array() {
+  local i
+  for i in "${@:2}"; do
+    [[ $1 = "$i" ]] && return
+  done
+}
+
+_ponymix() {
+  local flags='-h --help -c --card -d --device -t --devtype
+               --source --input --sink --output
+               --sink-input --source-output'
+  local types='sink sink-input source source-output'
+  local verbs=(help defaults set-default list list-short
+               list-cards list-cards-short get-volume set-volume
+               get-balance set-balance adj-balance increase decrease
+               mute unmute toggle is-muted move kill
+               list-profiles list-profiles-short get-profile set-profile)
+  local i=0 cur prev verb word devtype dev idx devices
+
+  _get_comp_words_by_ref cur prev
+
+  for word in "${COMP_WORDS[@]}"; do
+    # find the verb
+    if in_array "$word" "${verbs[@]}"; then
+      verb=$word
+      break
+    fi
+
+    case $word in
+      --devtype)
+        # look ahead to next word
+        if [[ ${COMP_WORDS[i+1]} ]]; then
+          devtype=${COMP_WORDS[i+1]}
+        fi
+        ;;
+      --devtype=*)
+        devtype=${word#--devtype=}
+        ;;
+      --sink|--output)
+        devtype=sink
+        ;;
+      --source|--input)
+        devtype=source
+        ;;
+      --sink-input|--source-output)
+        devtype=${word#--}
+        ;;
+    esac
+    (( ++i ))
+  done
+
+  case $prev in
+    --card|-c)
+      mapfile -t devices < <(\ponymix list-cards-short 2>/dev/null)
+      COMPREPLY=($(compgen -W '${devices[*]}' -- "$cur"))
+      ;;
+    --device|-d)
+      while IFS=$'\t' read _ dev idx _; do
+        devices+=("$dev" "$idx")
+      done < <(\ponymix "--${devtype:-sink}" list-short 2>/dev/null)
+      COMPREPLY=($(compgen -W '${devices[*]}' -- "$cur"))
+      ;;
+    --devtype|-t)
+      COMPREPLY=($(compgen -W '$types' -- "$cur"))
+      ;;
+  esac
+  [[ $COMPREPLY ]] && return 0
+
+  case $cur in
+    -*)
+      COMPREPLY=($(compgen -W '${flags[*]}' -- "$cur"))
+      ;;
+    *)
+      [[ -z $verb ]] && COMPREPLY=($(compgen -W '${verbs[*]}' -- "$cur"))
+      ;;
+  esac
+  [[ $COMPREPLY ]] && return 0
+
+  case $word in
+    '')
+      COMPREPLY=($(compgen -W '${verbs[*]}' -- "$cur"))
+      ;;
+  esac
+
+  return 0
+}
+
+complete -F _ponymix ponymix
+
+# vim: set et ts=2 sw=2: