chore(completion): add shell extension to completion file

Rename the bash completion script to use a .sh extension so its file
type is clearer in editors and tooling.

Keep the completion contents unchanged while making the filename
consistent with the script-style files in the repository.

1 files changed, 219 insertions, 0 deletions

diff --git a/transcode.sh.bash-completion.sh b/transcode.sh.bash-completion.sh
new file mode 100644
index 0000000..c980081
--- /dev/null
+++ b/transcode.sh.bash-completion.sh
@@ -0,0 +1,219 @@
+# SPDX-FileCopyrightText: 2025 Dennis Fink <me+coding@dennisfink.me>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+# bash completion for transcode.sh
+# Install to:
+#   /etc/bash_completion.d/transcode.sh
+# or source manually:
+#   source transcode.sh.bash-completion
+#
+# Each option that takes an argument is supported in all three forms:
+#   short          -f list.txt
+#   long space     --encode-file list.txt
+#   long equals    --encode-file=list.txt
+
+_transcode_sh() {
+  local cur prev words cword
+  _init_completion || return
+
+  local -r preset_dir="${XDG_CONFIG_HOME:-$HOME/.config}/transcode.sh/presets"
+
+  # ---------------------------------------------------------------------------
+  # Helper: collect preset names from the preset directory
+  # ---------------------------------------------------------------------------
+  _transcode_presets() {
+    local presets=()
+    if [[ -d "$preset_dir" ]]; then
+      local f
+      while IFS= read -r f; do
+        f="${f##*/}" # basename
+        f="${f%.sh}" # strip .sh extension
+        presets+=("$f")
+      done < <(find "$preset_dir" -maxdepth 1 -name '*.sh' -type f 2>/dev/null)
+    fi
+    printf '%s\n' "${presets[@]}"
+  }
+
+  local codecs='h264 hevc av1 vp8 vp9 mpeg2video mpeg4 mjpeg theora'
+  local nice_vals='0 5 10 15 19'
+  local hwaccel_methods='auto cuda vaapi dxva2 d3d11va videotoolbox qsv'
+  local ffmpeg_loglevels='quiet panic fatal error warning info verbose debug trace'
+  local video_streams='v:0 v:1 v:2 v:3'
+
+  # ---------------------------------------------------------------------------
+  # Handle --option=VALUE: cur contains the entire "--opt=val" token.
+  # Strip the "opt=" prefix and delegate to the appropriate completer.
+  # This must be checked before the $prev dispatch below.
+  # ---------------------------------------------------------------------------
+  case "$cur" in
+  --config-file=*)
+    cur="${cur#*=}"
+    _filedir
+    return
+    ;;
+  --backup-dir=*)
+    cur="${cur#*=}"
+    _filedir -d
+    return
+    ;;
+  --encode-file=*)
+    cur="${cur#*=}"
+    _filedir
+    return
+    ;;
+  --size-report-file=*)
+    cur="${cur#*=}"
+    _filedir
+    return
+    ;;
+  --nice=*)
+    cur="${cur#*=}"
+    COMPREPLY=($(compgen -W "$nice_vals" -- "$cur"))
+    return
+    ;;
+  --skip-codec=*)
+    cur="${cur#*=}"
+    COMPREPLY=($(compgen -W "$codecs" -- "$cur"))
+    return
+    ;;
+  --preset=*)
+    cur="${cur#*=}"
+    COMPREPLY=($(compgen -W "$(_transcode_presets)" -- "$cur"))
+    return
+    ;;
+  --hwaccel=*)
+    cur="${cur#*=}"
+    COMPREPLY=($(compgen -W "$hwaccel_methods" -- "$cur"))
+    return
+    ;;
+  --ffmpeg-loglevel=*)
+    cur="${cur#*=}"
+    COMPREPLY=($(compgen -W "$ffmpeg_loglevels" -- "$cur"))
+    return
+    ;;
+  --video-stream=*)
+    cur="${cur#*=}"
+    COMPREPLY=($(compgen -W "$video_streams" -- "$cur"))
+    return
+    ;;
+  esac
+
+  # ---------------------------------------------------------------------------
+  # Handle VALUE after short form (-f, -N, -S, -p) and
+  # long space form (--encode-file, --nice, --size-report-file, --skip-codec, --preset).
+  # $prev is the option word, $cur is the value being typed.
+  # ---------------------------------------------------------------------------
+  case "$prev" in
+  --config-file)
+    _filedir
+    return
+    ;;
+  --backup-dir)
+    _filedir -d
+    return
+    ;;
+  -f | --encode-file)
+    _filedir
+    return
+    ;;
+  -N | --nice)
+    COMPREPLY=($(compgen -W "$nice_vals" -- "$cur"))
+    return
+    ;;
+  --size-report-file)
+    _filedir
+    return
+    ;;
+  -S | --skip-codec)
+    COMPREPLY=($(compgen -W "$codecs" -- "$cur"))
+    return
+    ;;
+  -p | --preset)
+    COMPREPLY=($(compgen -W "$(_transcode_presets)" -- "$cur"))
+    return
+    ;;
+  --hwaccel)
+    COMPREPLY=($(compgen -W "$hwaccel_methods" -- "$cur"))
+    return
+    ;;
+  --ffmpeg-loglevel)
+    COMPREPLY=($(compgen -W "$ffmpeg_loglevels" -- "$cur"))
+    return
+    ;;
+  --video-stream)
+    COMPREPLY=($(compgen -W "$video_streams" -- "$cur"))
+    return
+    ;;
+  esac
+
+  # ---------------------------------------------------------------------------
+  # Complete option names themselves.
+  # For options that accept an argument we list both the bare long form
+  # (--nice) and the equals form (--nice=) so the user can choose their
+  # preferred style.  compopt -o nospace is applied when the sole match
+  # ends with '=' to avoid an unwanted trailing space in that case.
+  # ---------------------------------------------------------------------------
+  case "$cur" in
+  --*)
+    local longopts='
+      --backup-dir
+      --backup-dir=
+      --color
+      --config-file
+      --config-file=
+      --continue
+      --dry-run
+      --encode-file
+      --encode-file=
+      --ffmpeg-loglevel
+      --ffmpeg-loglevel=
+      --help
+      --hwaccel
+      --hwaccel=
+      --list-presets
+      --nice
+      --nice=
+      --no-color
+      --no-continue
+      --no-hwaccel
+      --no-only-if-smaller
+      --no-size-report
+      --no-verify-output
+      --only-if-smaller
+      --preset
+      --preset=
+      --quiet
+      --size-report
+      --size-report-file
+      --size-report-file=
+      --skip-codec
+      --skip-codec-override
+      --skip-codec=
+      --verbose
+      --verify-output
+      --version
+      --video-stream
+      --video-stream=
+    '
+    COMPREPLY=($(compgen -W "$longopts" -- "$cur"))
+    # Suppress the trailing space when the only completion ends with '='
+    [[ ${#COMPREPLY[@]} -eq 1 && "${COMPREPLY[0]}" == *= ]] &&
+      compopt -o nospace
+    return
+    ;;
+  -*)
+    local shortopts='-c -f -n -N -s -S -l -p -h -? -q -v --'
+    COMPREPLY=($(compgen -W "$shortopts" -- "$cur"))
+    return
+    ;;
+  esac
+
+  # ---------------------------------------------------------------------------
+  # Default: complete positional FILE arguments with common media extensions
+  # ---------------------------------------------------------------------------
+  _filedir '@(mkv|mp4|mov|avi|webm|flv|wmv|m4v|ts|mts|m2ts|mpg|mpeg|ogv|3gp|rm|rmvb)'
+}
+
+complete -F _transcode_sh transcode.sh
+complete -F _transcode_sh transcode