+#!/usr/bin/env bash
+# Desc: Wrapper for mpv that accepts directory paths via posargs or stdin lines
+# Usage: bkmpv2 [DIR]
+# Version: 0.0.1
+# Depends: GNU Parallel, GNU Bash v5.1.16, mpv v0.34.1, bc v1.07.1
+# Ref/Attrib: [1] Tange, Ole. GNU Parallel with Bash Array. 2019-03-24. https://unix.stackexchange.com/a/508365/411854
+# Example: find $HOME/Music -type d | bkmpv2
+# Example: bkmpv2 $HOME/Music/
+# Note: Does not follow symlinks
+
+# Find settings
+firegex=".+\(aac\|aif\|aiff\|flac\|m4a\|mp3\|mp4\|ogg\|opus\|wav\)$"; # update according to `find . -type f | grep -Eo "\.([[:alnum:]])+$" | sort -u`
+fsize="10k"; # default: minimum "10k"
+fdepth_posarg="10"; # find depth for positional arguments
+fdepth_stdin="1"; # find depth for stdin
+fc_falloff="1000"; # characteristic file count falloff in the output
+fc_redbase="10"; # logarithm base to reduce output file count
+
+export firegex fsize ; # export for parallel
+
+#===Declare local functions===
+yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
+die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
+must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
+checkapp() {
+ # Desc: If arg is a command, save result in assoc array 'appRollCall'
+ # Usage: checkapp arg1 arg2 arg3 ...
+ # Version: 0.1.1
+ # Input: global assoc. array 'appRollCall'
+ # Output: adds/updates key(value) to global assoc array 'appRollCall'
+ # Depends: bash 5.0.3
+ local returnState
+
+ #===Process Args===
+ for arg in "$@"; do
+ if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command
+ appRollCall[$arg]="true";
+ if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
+ else
+ appRollCall[$arg]="false"; returnState="false";
+ fi;
+ done;
+
+ #===Determine function return code===
+ if [ "$returnState" = "true" ]; then
+ return 0;
+ else
+ return 1;
+ fi;
+} # Check that app exists
+checkfile() {
+ # Desc: If arg is a file path, save result in assoc array 'fileRollCall'
+ # Usage: checkfile arg1 arg2 arg3 ...
+ # Version: 0.1.1
+ # Input: global assoc. array 'fileRollCall'
+ # Output: adds/updates key(value) to global assoc array 'fileRollCall';
+ # Output: returns 0 if app found, 1 otherwise
+ # Depends: bash 5.0.3
+ local returnState
+
+ #===Process Args===
+ for arg in "$@"; do
+ if [ -f "$arg" ]; then
+ fileRollCall["$arg"]="true";
+ if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
+ else
+ fileRollCall["$arg"]="false"; returnState="false";
+ fi;
+ done;
+
+ #===Determine function return code===
+ if [ "$returnState" = "true" ]; then
+ return 0;
+ else
+ return 1;
+ fi;
+} # Check that file exists
+checkdir() {
+ # Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
+ # Usage: checkdir arg1 arg2 arg3 ...
+ # Version 0.1.1
+ # Input: global assoc. array 'dirRollCall'
+ # Output: adds/updates key(value) to global assoc array 'dirRollCall';
+ # Output: returns 0 if app found, 1 otherwise
+ # Depends: Bash 5.0.3
+ local returnState
+
+ #===Process Args===
+ for arg in "$@"; do
+ if [ -d "$arg" ]; then
+ dirRollCall["$arg"]="true";
+ if ! [ "$returnState" = "false" ]; then returnState="true"; fi
+ else
+ dirRollCall["$arg"]="false"; returnState="false";
+ fi
+ done
+
+ #===Determine function return code===
+ if [ "$returnState" = "true" ]; then
+ return 0;
+ else
+ return 1;
+ fi
+} # Check that dir exists
+displayMissing() {
+ # Desc: Displays missing apps, files, and dirs
+ # Usage: displayMissing
+ # Version 0.1.1
+ # Input: associative arrays: appRollCall, fileRollCall, dirRollCall
+ # Output: stderr: messages indicating missing apps, file, or dirs
+ # Depends: bash 5, checkAppFileDir()
+ local missingApps value appMissing missingFiles fileMissing
+ local missingDirs dirMissing
+
+ #==BEGIN Display errors==
+ #===BEGIN Display Missing Apps===
+ missingApps="Missing apps :";
+ #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
+ for key in "${!appRollCall[@]}"; do
+ value="${appRollCall[$key]}";
+ if [ "$value" = "false" ]; then
+ #echo "DEBUG:Missing apps: $key => $value";
+ missingApps="$missingApps""$key ";
+ appMissing="true";
+ fi;
+ done;
+ if [ "$appMissing" = "true" ]; then # Only indicate if an app is missing.
+ echo "$missingApps" 1>&2;
+ fi;
+ unset value;
+ #===END Display Missing Apps===
+
+ #===BEGIN Display Missing Files===
+ missingFiles="Missing files:";
+ #for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done
+ for key in "${!fileRollCall[@]}"; do
+ value="${fileRollCall[$key]}";
+ if [ "$value" = "false" ]; then
+ #echo "DEBUG:Missing files: $key => $value";
+ missingFiles="$missingFiles""$key ";
+ fileMissing="true";
+ fi;
+ done;
+ if [ "$fileMissing" = "true" ]; then # Only indicate if an app is missing.
+ echo "$missingFiles" 1>&2;
+ fi;
+ unset value;
+ #===END Display Missing Files===
+
+ #===BEGIN Display Missing Directories===
+ missingDirs="Missing dirs:";
+ #for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done
+ for key in "${!dirRollCall[@]}"; do
+ value="${dirRollCall[$key]}";
+ if [ "$value" = "false" ]; then
+ #echo "DEBUG:Missing dirs: $key => $value";
+ missingDirs="$missingDirs""$key ";
+ dirMissing="true";
+ fi;
+ done;
+ if [ "$dirMissing" = "true" ]; then # Only indicate if an dir is missing.
+ echo "$missingDirs" 1>&2;
+ fi;
+ unset value;
+ #===END Display Missing Directories===
+
+ #==END Display errors==
+} # Display missing apps, files, dirs
+check_depends() {
+ if ! checkapp mpv parallel bkshuf bc b2sum; then
+ displayMissing;
+ die "FATAL:Missing apps.";
+ fi;
+ return 1;
+}; # check dependencies
+checkInt() {
+ # Desc: Checks if arg is integer
+ # Usage: checkInt arg
+ # Input: arg: integer
+ # Output: - return code 0 (if arg is integer)
+ # - return code 1 (if arg is not integer)
+ # Example: if ! checkInt $arg; then echo "not int"; fi;
+ # Version: 0.0.1
+ local returnState
+
+ #===Process Arg===
+ if [[ $# -ne 1 ]]; then
+ die "ERROR:Invalid number of arguments:$#";
+ fi;
+
+ RETEST1='^[0-9]+$'; # Regular Expression to test
+ if [[ ! $1 =~ $RETEST1 ]] ; then
+ returnState="false";
+ else
+ returnState="true";
+ fi;
+
+ #===Determine function return code===
+ if [ "$returnState" = "true" ]; then
+ return 0;
+ else
+ return 1;
+ fi;
+} # Checks if arg is integer
+read_stdin() {
+ # Desc: Consumes stdin; outputs as stdout lines
+ # Input: stdin (consumes)
+ # Output: stdout (newline delimited)
+ # Example: printf "foo\nbar\n" | read_stdin
+ # Depends: GNU bash (version 5.1.16)
+ # Version: 0.0.1
+ local input_stdin output;
+
+ # Store stdin
+ if [[ -p /dev/stdin ]]; then
+ input_stdin="$(cat -)";
+ fi;
+
+ # Store as output array elements
+ ## Read in stdin
+ if [[ -n $input_stdin ]]; then
+ while read -r line; do
+ output+=("$line");
+ done < <(printf "%s\n" "$input_stdin");
+ fi;
+
+ # Print to stdout
+ printf "%s\n" "${output[@]}";
+}; # read stdin to stdout lines
+read_psarg() {
+ # Desc: Reads arguments; outputs as stdout lines
+ # Input: args
+ # Output: stdout (newline delimited)
+ # Example: read_psarg "$@"
+ # Depends: GNU bash (version 5.1.16)
+ # Version: 0.0.1
+ local input_psarg output;
+
+ # Store arguments
+ if [[ $# -gt 0 ]]; then
+ input_psarg="$*";
+ fi;
+
+ # Store as output array elements
+ ## Read in positional arguments
+ if [[ -n $input_psarg ]]; then
+ for arg in "$@"; do
+ output+=("$arg");
+ done;
+ fi;
+
+ # Print to stdout
+ printf "%s\n" "${output[@]}";
+}; # read positional argument to stdout lines
+find_flist() {
+ # Desc: print file list to stdout via `find` using script parameters
+ # Input: arg1: path to dir
+ # var: find_depth
+ # var: pattern_find_iregex
+ # var: find_size
+ if [[ ! -d "$1" ]]; then return 1; fi;
+ must find "$1" -maxdepth "$fdepth" -type f -iregex "$firegex" -size +"$fsize";
+}; # print file list to stdout from dir with script parameters
+main() {
+ # Input: var: firegex find iregex file name pattern
+ # var: fsize find minimum file siz
+ # var: fc_falloff characteristic file count falloff in the output
+ # var: fc_redbase logarithm base to reduce output file count
+
+ local re_dotfile;
+ declare -a dirs_stdin dirs_psarg;
+ declare -a paths_files;
+ declare list_paths_files;
+ declare -a cmd_args;
+ check_depends;
+
+ yell "STATUS:$SECONDS:Started.";
+ #Populate dirs_stdin and dirs_psarg arrays
+ ## Read stdin as lines
+ re_dotfile="^\."; # first char is a dot
+ while read -r line; do
+ line="$(readlink -e "$line")";
+ # Check if dir
+ if [[ ! -d "$line" ]]; then
+ echo "ERROR:Not a dir:$line" 1>&2;
+ continue;
+ fi;
+ dir_name="$(basename "$line")";
+ # Exclude dotdirs
+ if [[ "$dir_name" =~ $re_dotfile ]]; then
+ echo "ERROR:Is a dotdir:$line" 1>&2;
+ continue
+ fi;
+ dirs_stdin+=("$line");
+ done < <(read_stdin);
+ yell "STATUS:$SECONDS:Read stdin.";
+ ## Read positional arguments as lines
+ re_dotfile="^\."; # first char is a dot
+ while read -r line; do
+ line="$(readlink -e "$line")";
+ # Check if dir
+ if [[ ! -d "$line" ]]; then
+ echo "ERROR:Not a dir:$line" 1>&2;
+ continue;
+ fi;
+ dir_name="$(basename "$line")";
+ # Exclude dotdirs
+ if [[ "$dir_name" =~ $re_dotfile ]]; then
+ echo "ERROR:Is a dotdir:$line" 1>&2;
+ continue
+ fi;
+ dirs_psarg+=("$line");
+ done < <(read_psarg "$@");
+ yell "STATUS:$SECONDS:Read posargs.";
+
+ # Catch all arrays empty
+ if [[ "${#dirs_stdin[@]}" -le 0 ]] && [[ "${#dirs_psarg[@]}" -le 0 ]]; then
+ die "FATAL:No valid directories provided.";
+ fi;
+
+ # Generate file list
+ ## Call find_filelist() in parallel for positional argument input
+ if [[ "${#dirs_psarg[@]}" -gt 0 ]]; then
+ fdepth="$fdepth_posarg"; export fdepth; # for dirs from positional arguments
+ paths_files+=("$( parallel find_flist {} "$fdepth" "$firegex" "$fsize" ::: "${dirs_psarg[@]}" )"); # See [1]
+ fi;
+ ## Call find_filelist() in parallel for stdin input
+ if [[ "${#dirs_stdin[@]}" -gt 0 ]]; then
+ fdepth="$fdepth_stdin"; export fdepth; # 1 for dirs from stdin
+ paths_files+=("$( parallel find_flist {} "$fdepth" "$firegex" "$fsize" ::: "${dirs_stdin[@]}" )"); # See [1]
+ fi;
+
+ # Convert paths_files array into file list
+ for i in "${!paths_files[@]}"; do
+ list_paths_files="$(printf "%s\n%s" "${paths_files[$i]}" "$list_paths_files")";
+ done;
+ # Get stats
+ fc="$(wc -l < <(echo -n "$list_paths_files"))";
+ echo "STATUS:$SECONDS:file count:fc:$fc"
+ yell "STATUS:$SECONDS:Generated file list.";
+
+ # Sort, remove duplicate paths
+ list_paths_files="$(echo "$list_paths_files" | sort -u | tr -s '\n')";
+ yell "STATUS:$SECONDS:Sorted and deduplicated list.";
+
+ # Remove paths with dotfiles
+ list_paths_files="$(echo "$list_paths_files" | grep -viE "/\." )";
+ yell "STATUS:$SECONDS:Removed dotfiles.";
+
+ # Write playlist
+ list_paths_files_tmp="/dev/shm/$(date +%Y%m%dT%H%M%S.%N%z)"..mpv_paths.txt;
+ ## Reduce output file count if greater than falloff
+ if [[ $fc -gt $fc_falloff ]]; then
+ bc_exp="$fc_falloff * (1 + l( $fc / $fc_falloff )/l($fc_redbase))";
+ fc_out="$( echo "$bc_exp" | bc -l )";
+ else
+ fc_out="$fc";
+ fi;
+ ## Reduce output file count by fixed fraction (bkshuf optimization)
+ fc_out="$(echo "$fc_out * 0.75" | bc -l)";
+ ## Select subset via bkshuf
+ ### Specify bkshuf-specific environment variables
+ export BKSHUF_PARAM_LINC=1000000; # for these numbers of lines of input..
+ export BKSHUF_PARAM_GSIZE=25; # target this group size
+ ### Round file count down
+ fc_out="$(printf "%.0f" "$fc_out")"; # round float down to int
+ ### Get neighbor-preserving shuffled subset (size $fc_out)
+ yell "STATUS:$SECONDS:Selecting $fc_out files via bkshuf...";
+ must \
+ echo -n "$list_paths_files" | \
+ bkshuf "$fc_out" > "$list_paths_files_tmp";
+ yell "STATUS:$SECONDS:Wrote playlist.";
+
+ # Print stats
+ yell "STATUS:$SECONDS:Built file list in $SECONDS seconds.";
+
+ # Run mpv with filelist
+ ## Form command
+ cmd_args+=("mpv");
+ cmd_args+=("--audio-display=no"); # disable video for audio files
+ cmd_args+=("--vid=no"); # donʼt show video track
+ cmd_args+=("--image-display-duration=0"); # don't show album art
+ cmd_args+=("--af=scaletempo=stride=15:overlap=1:search=15"); # improve scrubbing
+ cmd_args+=("--playlist=$list_paths_files_tmp"); # read playlist
+ declare -p cmd_args; # debug
+ ## Execute command
+ must "${cmd_args[@]}";
+ must rm "$list_paths_files_tmp";
+};
+export -f yell die must read_stdin read_psarg find_flist;
+
+main "$@";
+
+# Author: Steven Baltakatei Sandoval
+# License: GPLv3+
projects / BK-2020-03.git / commitdiff