fix(user/bkots):Remove unnecessary backslash escaping
[BK-2020-03.git] / user / bkmpv2
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1#!/usr/bin/env bash
2# Desc: Wrapper for mpv that accepts directory or file paths via posargs or stdin lines
3# Usage: bkmpv2 [DIR]
4# Version: 0.2.0
5# Depends: GNU Parallel, GNU Bash v5.1.16, mpv v0.34.1, bc v1.07.1
6# Ref/Attrib: [1] Tange, Ole. GNU Parallel with Bash Array. 2019-03-24. https://unix.stackexchange.com/a/508365/411854
7# Example: find $HOME/Music -type d | bkmpv2
8# Example: bkmpv2 $HOME/Music/
9# Example: find $HOME -type f -name "*.mp3" | bkmpv2
10# Note: Does not follow symlinks
11
12# Find settings
13firegex=".+\(aac\|aif\|aiff\|flac\|m4a\|mp3\|mp4\|ogg\|opus\|wav\)$"; # POSIX regex for find. Update according to `find . -type f | grep -Eo "\.([[:alnum:]])+$" | sort -u`
14file_regex=".+(aac|aif|aiff|flac|m4a|mp3|mp4|ogg|opus|wav)$"; # extended regex for Bash.
15fsize="10k"; # default: minimum "10k"
16fdepth_posarg="10"; # find depth for positional arguments
17fdepth_stdin="1"; # find depth for stdin
18fc_falloff="1000"; # characteristic file count falloff in the output
19fc_redbase="10"; # logarithm base to reduce output file count
20
21export firegex fsize ; # export for parallel
22
23#===Declare local functions===
24yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
25die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
26must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
27checkapp() {
28 # Desc: If arg is a command, save result in assoc array 'appRollCall'
29 # Usage: checkapp arg1 arg2 arg3 ...
30 # Version: 0.1.1
31 # Input: global assoc. array 'appRollCall'
32 # Output: adds/updates key(value) to global assoc array 'appRollCall'
33 # Depends: bash 5.0.3
34 local returnState
35
36 #===Process Args===
37 for arg in "$@"; do
38 if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command
39 appRollCall[$arg]="true";
40 if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
41 else
42 appRollCall[$arg]="false"; returnState="false";
43 fi;
44 done;
45
46 #===Determine function return code===
47 if [ "$returnState" = "true" ]; then
48 return 0;
49 else
50 return 1;
51 fi;
52} # Check that app exists
53checkfile() {
54 # Desc: If arg is a file path, save result in assoc array 'fileRollCall'
55 # Usage: checkfile arg1 arg2 arg3 ...
56 # Version: 0.1.1
57 # Input: global assoc. array 'fileRollCall'
58 # Output: adds/updates key(value) to global assoc array 'fileRollCall';
59 # Output: returns 0 if app found, 1 otherwise
60 # Depends: bash 5.0.3
61 local returnState
62
63 #===Process Args===
64 for arg in "$@"; do
65 if [ -f "$arg" ]; then
66 fileRollCall["$arg"]="true";
67 if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
68 else
69 fileRollCall["$arg"]="false"; returnState="false";
70 fi;
71 done;
72
73 #===Determine function return code===
74 if [ "$returnState" = "true" ]; then
75 return 0;
76 else
77 return 1;
78 fi;
79} # Check that file exists
80checkdir() {
81 # Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
82 # Usage: checkdir arg1 arg2 arg3 ...
83 # Version 0.1.1
84 # Input: global assoc. array 'dirRollCall'
85 # Output: adds/updates key(value) to global assoc array 'dirRollCall';
86 # Output: returns 0 if app found, 1 otherwise
87 # Depends: Bash 5.0.3
88 local returnState
89
90 #===Process Args===
91 for arg in "$@"; do
92 if [ -d "$arg" ]; then
93 dirRollCall["$arg"]="true";
94 if ! [ "$returnState" = "false" ]; then returnState="true"; fi
95 else
96 dirRollCall["$arg"]="false"; returnState="false";
97 fi
98 done
99
100 #===Determine function return code===
101 if [ "$returnState" = "true" ]; then
102 return 0;
103 else
104 return 1;
105 fi
106} # Check that dir exists
107displayMissing() {
108 # Desc: Displays missing apps, files, and dirs
109 # Usage: displayMissing
110 # Version 0.1.1
111 # Input: associative arrays: appRollCall, fileRollCall, dirRollCall
112 # Output: stderr: messages indicating missing apps, file, or dirs
113 # Depends: bash 5, checkAppFileDir()
114 local missingApps value appMissing missingFiles fileMissing
115 local missingDirs dirMissing
116
117 #==BEGIN Display errors==
118 #===BEGIN Display Missing Apps===
119 missingApps="Missing apps :";
120 #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
121 for key in "${!appRollCall[@]}"; do
122 value="${appRollCall[$key]}";
123 if [ "$value" = "false" ]; then
124 #echo "DEBUG:Missing apps: $key => $value";
125 missingApps="$missingApps""$key ";
126 appMissing="true";
127 fi;
128 done;
129 if [ "$appMissing" = "true" ]; then # Only indicate if an app is missing.
130 echo "$missingApps" 1>&2;
131 fi;
132 unset value;
133 #===END Display Missing Apps===
134
135 #===BEGIN Display Missing Files===
136 missingFiles="Missing files:";
137 #for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done
138 for key in "${!fileRollCall[@]}"; do
139 value="${fileRollCall[$key]}";
140 if [ "$value" = "false" ]; then
141 #echo "DEBUG:Missing files: $key => $value";
142 missingFiles="$missingFiles""$key ";
143 fileMissing="true";
144 fi;
145 done;
146 if [ "$fileMissing" = "true" ]; then # Only indicate if an app is missing.
147 echo "$missingFiles" 1>&2;
148 fi;
149 unset value;
150 #===END Display Missing Files===
151
152 #===BEGIN Display Missing Directories===
153 missingDirs="Missing dirs:";
154 #for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done
155 for key in "${!dirRollCall[@]}"; do
156 value="${dirRollCall[$key]}";
157 if [ "$value" = "false" ]; then
158 #echo "DEBUG:Missing dirs: $key => $value";
159 missingDirs="$missingDirs""$key ";
160 dirMissing="true";
161 fi;
162 done;
163 if [ "$dirMissing" = "true" ]; then # Only indicate if an dir is missing.
164 echo "$missingDirs" 1>&2;
165 fi;
166 unset value;
167 #===END Display Missing Directories===
168
169 #==END Display errors==
170} # Display missing apps, files, dirs
171check_depends() {
172 if ! checkapp mpv parallel bkshuf bc b2sum; then
173 displayMissing;
174 die "FATAL:Missing apps.";
175 fi;
176 return 1;
177}; # check dependencies
178checkInt() {
179 # Desc: Checks if arg is integer
180 # Usage: checkInt arg
181 # Input: arg: integer
182 # Output: - return code 0 (if arg is integer)
183 # - return code 1 (if arg is not integer)
184 # Example: if ! checkInt $arg; then echo "not int"; fi;
185 # Version: 0.0.1
186 local returnState
187
188 #===Process Arg===
189 if [[ $# -ne 1 ]]; then
190 die "ERROR:Invalid number of arguments:$#";
191 fi;
192
193 RETEST1='^[0-9]+$'; # Regular Expression to test
194 if [[ ! $1 =~ $RETEST1 ]] ; then
195 returnState="false";
196 else
197 returnState="true";
198 fi;
199
200 #===Determine function return code===
201 if [ "$returnState" = "true" ]; then
202 return 0;
203 else
204 return 1;
205 fi;
206} # Checks if arg is integer
207read_stdin() {
208 # Desc: Consumes stdin; outputs as stdout lines
209 # Input: stdin (consumes)
210 # Output: stdout (newline delimited)
211 # Example: printf "foo\nbar\n" | read_stdin
212 # Depends: GNU bash (version 5.1.16)
213 # Version: 0.0.1
214 local input_stdin output;
215
216 # Store stdin
217 if [[ -p /dev/stdin ]]; then
218 input_stdin="$(cat -)";
219 fi;
220
221 # Store as output array elements
222 ## Read in stdin
223 if [[ -n $input_stdin ]]; then
224 while read -r line; do
225 output+=("$line");
226 done < <(printf "%s\n" "$input_stdin");
227 fi;
228
229 # Print to stdout
230 printf "%s\n" "${output[@]}";
231}; # read stdin to stdout lines
232read_psarg() {
233 # Desc: Reads arguments; outputs as stdout lines
234 # Input: args
235 # Output: stdout (newline delimited)
236 # Example: read_psarg "$@"
237 # Depends: GNU bash (version 5.1.16)
238 # Version: 0.0.1
239 local input_psarg output;
240
241 # Store arguments
242 if [[ $# -gt 0 ]]; then
243 input_psarg="$*";
244 fi;
245
246 # Store as output array elements
247 ## Read in positional arguments
248 if [[ -n $input_psarg ]]; then
249 for arg in "$@"; do
250 output+=("$arg");
251 done;
252 fi;
253
254 # Print to stdout
255 printf "%s\n" "${output[@]}";
256}; # read positional argument to stdout lines
257find_flist() {
258 # Desc: print file list to stdout via `find` using script parameters
259 # Input: arg1: path to dir
260 # var: find_depth
261 # var: pattern_find_iregex
262 # var: find_size
263 if [[ ! -d "$1" ]]; then return 1; fi;
264 must find "$1" -maxdepth "$fdepth" -type f -iregex "$firegex" -size +"$fsize";
265}; # print file list to stdout from dir with script parameters
266check_files() {
267 # Desc: Applies $file_regex to files specified by path
268 # Input: var: file_regex
269 # array: files_stdin
270 # Output: array: files_stdin
271 local file;
272 declare -a filtered_files_stdin;
273
274 for file in "${files_stdin[@]}"; do
275 if [[ "$file" =~ $file_regex ]]; then
276 filtered_files_stdin+=("$file");
277 fi;
278 done;
279 files_stdin=("${filtered_files_stdin[@]}");
280}; # apply $firegex to files_stdin array
281main() {
282 # Input: var: firegex find iregex file name pattern
283 # var: fsize find minimum file siz
284 # var: fc_falloff characteristic file count falloff in the output
285 # var: fc_redbase logarithm base to reduce output file count
286
287 local re_dotfile;
288 declare -a files_stdin dirs_stdin dirs_psarg;
289 declare -a paths_files;
290 declare list_paths_files;
291 declare -a cmd_args;
292 check_depends;
293
294 yell "STATUS:$SECONDS:Started.";
295 #Populate dirs_stdin and dirs_psarg arrays
296 ## Read stdin as lines
297 re_dotfile="^\."; # first char is a dot
298 while read -r line; do
299 line="$(readlink -e "$line")";
300 line_bn="$(basename "$line")";
301 # Check if dir and not dotfile
302 if [[ -d "$line" ]] && [[ ! "$line_bn" =~ $re_dotfile ]]; then
303 dirs_stdin+=("$line");
304 continue;
305 fi;
306
307 # Check if file
308 if [[ -f "$line" ]]; then
309 files_stdin+=("$line");
310 continue;
311 fi;
312
313 # Throw warning
314 yell "WARNING:Not a valid dir or file:$line";
315 done < <( read_stdin; read_psarg "$@"; );
316 yell "STATUS:$SECONDS:Read stdin and psargs.";
317
318 # Apply the $file_regex to $files_stdin array
319 check_files;
320
321 # Catch all arrays empty
322 if [[ "${#dirs_stdin[@]}" -le 0 ]] && \
323 [[ "${#dirs_psarg[@]}" -le 0 ]] && \
324 [[ "${#files_stdin[@]}" -le 0 ]]; then
325 die "FATAL:No valid directories or files provided.";
326 fi;
327
328 # Generate file list
329 ## Add stdin argument input
330 if [[ "${#files_stdin[@]}" -gt 0 ]]; then
331 paths_files+=("${files_stdin[@]}");
332 fi;
333
334 ## Call find_filelist() in parallel for positional argument input
335 if [[ "${#dirs_psarg[@]}" -gt 0 ]]; then
336 fdepth="$fdepth_posarg"; export fdepth; # for dirs from positional arguments
337 paths_files+=("$( parallel find_flist {} "$fdepth" "$firegex" "$fsize" ::: "${dirs_psarg[@]}" )"); # See [1]
338 fi;
339 ## Call find_filelist() in parallel for stdin input
340 if [[ "${#dirs_stdin[@]}" -gt 0 ]]; then
341 fdepth="$fdepth_stdin"; export fdepth; # 1 for dirs from stdin
342 paths_files+=("$( parallel find_flist {} "$fdepth" "$firegex" "$fsize" ::: "${dirs_stdin[@]}" )"); # See [1]
343 fi;
344
345 # Convert paths_files array into file list
346 for i in "${!paths_files[@]}"; do
347 list_paths_files="$(printf "%s\n%s" "${paths_files[$i]}" "$list_paths_files")";
348 done;
349 # Get stats
350 fc="$(wc -l < <(echo -n "$list_paths_files"))";
351 echo "STATUS:$SECONDS:file count:fc:$fc"
352 yell "STATUS:$SECONDS:Generated file list.";
353
354 # Sort, remove duplicate paths
355 list_paths_files="$(echo "$list_paths_files" | sort -u | tr -s '\n')";
356 yell "STATUS:$SECONDS:Sorted and deduplicated list.";
357
358 # Remove paths with dotfiles
359 list_paths_files="$(echo "$list_paths_files" | grep -viE "/\." )";
360 yell "STATUS:$SECONDS:Removed dotfiles.";
361
362 # Write playlist
363 list_paths_files_tmp="/dev/shm/$(date +%Y%m%dT%H%M%S.%N%z)"..mpv_paths.txt;
364 ## Reduce output file count if greater than falloff
365 if [[ $fc -gt $fc_falloff ]]; then
366 bc_exp="$fc_falloff * (1 + l( $fc / $fc_falloff )/l($fc_redbase))";
367 fc_out="$( echo "$bc_exp" | bc -l )";
368 else
369 fc_out="$fc";
370 fi;
371 ## Reduce output file count by fixed fraction (bkshuf optimization)
372 fc_out="$(echo "$fc_out * 0.75" | bc -l)";
373 ## Select subset via bkshuf
374 ### Specify bkshuf-specific environment variables
375 export BKSHUF_PARAM_LINC=1000000; # for these numbers of lines of input..
376 export BKSHUF_PARAM_GSIZE=25; # target this group size
377 ### Round file count down
378 fc_out="$(printf "%.0f" "$fc_out")"; # round float down to int
379 ### Get neighbor-preserving shuffled subset (size $fc_out)
380 yell "STATUS:$SECONDS:Selecting $fc_out of $fc files via bkshuf...";
381 must \
382 echo -n "$list_paths_files" | \
383 bkshuf "$fc_out" > "$list_paths_files_tmp";
384 yell "STATUS:$SECONDS:Wrote playlist.";
385
386 # Print stats
387 yell "STATUS:$SECONDS:Built file list in $SECONDS seconds.";
388
389 # Run mpv with filelist
390 ## Form command
391 cmd_args+=("mpv");
392 cmd_args+=("--audio-display=no"); # disable video for audio files
393 cmd_args+=("--vid=no"); # donʼt show video track
394 cmd_args+=("--image-display-duration=0"); # don't show album art
395 cmd_args+=("--af=scaletempo=stride=15:overlap=1:search=15"); # improve scrubbing
396 cmd_args+=("--playlist=$list_paths_files_tmp"); # read playlist
397 declare -p cmd_args; # debug
398 ## Execute command
399 must "${cmd_args[@]}";
400 must rm "$list_paths_files_tmp";
401};
402export -f yell die must read_stdin read_psarg find_flist;
403
404main "$@";
405
406# Author: Steven Baltakatei Sandoval
407# License: GPLv3+