| 1 | #!/usr/bin/env bash |
| 2 | # Desc: Wrapper for feh that accepts directory paths via posargs or stdin lines. |
| 3 | # Version: 0.3.0 |
| 4 | # Ref/Attrib: [1] Tange, Ole. GNU Parallel with Bash Array. 2019-03-24. https://unix.stackexchange.com/a/508365/411854 |
| 5 | # Depends: GNU Parallel, GNU Bash v5.1.16, feh 3.6.3, GNU Coreutils 8.32 (b2sum) |
| 6 | |
| 7 | #===Declare local functions=== |
| 8 | yell() { echo "$0: $*" >&2; } # print script path and all args to stderr |
| 9 | die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status |
| 10 | must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails |
| 11 | checkapp() { |
| 12 | # Desc: If arg is a command, save result in assoc array 'appRollCall' |
| 13 | # Usage: checkapp arg1 arg2 arg3 ... |
| 14 | # Version: 0.1.1 |
| 15 | # Input: global assoc. array 'appRollCall' |
| 16 | # Output: adds/updates key(value) to global assoc array 'appRollCall' |
| 17 | # Depends: bash 5.0.3 |
| 18 | local returnState |
| 19 | |
| 20 | #===Process Args=== |
| 21 | for arg in "$@"; do |
| 22 | if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command |
| 23 | appRollCall[$arg]="true"; |
| 24 | if ! [ "$returnState" = "false" ]; then returnState="true"; fi; |
| 25 | else |
| 26 | appRollCall[$arg]="false"; returnState="false"; |
| 27 | fi; |
| 28 | done; |
| 29 | |
| 30 | #===Determine function return code=== |
| 31 | if [ "$returnState" = "true" ]; then |
| 32 | return 0; |
| 33 | else |
| 34 | return 1; |
| 35 | fi; |
| 36 | } # Check that app exists |
| 37 | checkfile() { |
| 38 | # Desc: If arg is a file path, save result in assoc array 'fileRollCall' |
| 39 | # Usage: checkfile arg1 arg2 arg3 ... |
| 40 | # Version: 0.1.1 |
| 41 | # Input: global assoc. array 'fileRollCall' |
| 42 | # Output: adds/updates key(value) to global assoc array 'fileRollCall'; |
| 43 | # Output: returns 0 if app found, 1 otherwise |
| 44 | # Depends: bash 5.0.3 |
| 45 | local returnState |
| 46 | |
| 47 | #===Process Args=== |
| 48 | for arg in "$@"; do |
| 49 | if [ -f "$arg" ]; then |
| 50 | fileRollCall["$arg"]="true"; |
| 51 | if ! [ "$returnState" = "false" ]; then returnState="true"; fi; |
| 52 | else |
| 53 | fileRollCall["$arg"]="false"; returnState="false"; |
| 54 | fi; |
| 55 | done; |
| 56 | |
| 57 | #===Determine function return code=== |
| 58 | if [ "$returnState" = "true" ]; then |
| 59 | return 0; |
| 60 | else |
| 61 | return 1; |
| 62 | fi; |
| 63 | } # Check that file exists |
| 64 | checkdir() { |
| 65 | # Desc: If arg is a dir path, save result in assoc array 'dirRollCall' |
| 66 | # Usage: checkdir arg1 arg2 arg3 ... |
| 67 | # Version 0.1.1 |
| 68 | # Input: global assoc. array 'dirRollCall' |
| 69 | # Output: adds/updates key(value) to global assoc array 'dirRollCall'; |
| 70 | # Output: returns 0 if app found, 1 otherwise |
| 71 | # Depends: Bash 5.0.3 |
| 72 | local returnState |
| 73 | |
| 74 | #===Process Args=== |
| 75 | for arg in "$@"; do |
| 76 | if [ -d "$arg" ]; then |
| 77 | dirRollCall["$arg"]="true"; |
| 78 | if ! [ "$returnState" = "false" ]; then returnState="true"; fi |
| 79 | else |
| 80 | dirRollCall["$arg"]="false"; returnState="false"; |
| 81 | fi |
| 82 | done |
| 83 | |
| 84 | #===Determine function return code=== |
| 85 | if [ "$returnState" = "true" ]; then |
| 86 | return 0; |
| 87 | else |
| 88 | return 1; |
| 89 | fi |
| 90 | } # Check that dir exists |
| 91 | displayMissing() { |
| 92 | # Desc: Displays missing apps, files, and dirs |
| 93 | # Usage: displayMissing |
| 94 | # Version 0.1.1 |
| 95 | # Input: associative arrays: appRollCall, fileRollCall, dirRollCall |
| 96 | # Output: stderr: messages indicating missing apps, file, or dirs |
| 97 | # Depends: bash 5, checkAppFileDir() |
| 98 | local missingApps value appMissing missingFiles fileMissing |
| 99 | local missingDirs dirMissing |
| 100 | |
| 101 | #==BEGIN Display errors== |
| 102 | #===BEGIN Display Missing Apps=== |
| 103 | missingApps="Missing apps :"; |
| 104 | #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done |
| 105 | for key in "${!appRollCall[@]}"; do |
| 106 | value="${appRollCall[$key]}"; |
| 107 | if [ "$value" = "false" ]; then |
| 108 | #echo "DEBUG:Missing apps: $key => $value"; |
| 109 | missingApps="$missingApps""$key "; |
| 110 | appMissing="true"; |
| 111 | fi; |
| 112 | done; |
| 113 | if [ "$appMissing" = "true" ]; then # Only indicate if an app is missing. |
| 114 | echo "$missingApps" 1>&2; |
| 115 | fi; |
| 116 | unset value; |
| 117 | #===END Display Missing Apps=== |
| 118 | |
| 119 | #===BEGIN Display Missing Files=== |
| 120 | missingFiles="Missing files:"; |
| 121 | #for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done |
| 122 | for key in "${!fileRollCall[@]}"; do |
| 123 | value="${fileRollCall[$key]}"; |
| 124 | if [ "$value" = "false" ]; then |
| 125 | #echo "DEBUG:Missing files: $key => $value"; |
| 126 | missingFiles="$missingFiles""$key "; |
| 127 | fileMissing="true"; |
| 128 | fi; |
| 129 | done; |
| 130 | if [ "$fileMissing" = "true" ]; then # Only indicate if an app is missing. |
| 131 | echo "$missingFiles" 1>&2; |
| 132 | fi; |
| 133 | unset value; |
| 134 | #===END Display Missing Files=== |
| 135 | |
| 136 | #===BEGIN Display Missing Directories=== |
| 137 | missingDirs="Missing dirs:"; |
| 138 | #for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done |
| 139 | for key in "${!dirRollCall[@]}"; do |
| 140 | value="${dirRollCall[$key]}"; |
| 141 | if [ "$value" = "false" ]; then |
| 142 | #echo "DEBUG:Missing dirs: $key => $value"; |
| 143 | missingDirs="$missingDirs""$key "; |
| 144 | dirMissing="true"; |
| 145 | fi; |
| 146 | done; |
| 147 | if [ "$dirMissing" = "true" ]; then # Only indicate if an dir is missing. |
| 148 | echo "$missingDirs" 1>&2; |
| 149 | fi; |
| 150 | unset value; |
| 151 | #===END Display Missing Directories=== |
| 152 | |
| 153 | #==END Display errors== |
| 154 | } # Display missing apps, files, dirs |
| 155 | check_depends() { |
| 156 | if ! checkapp feh parallel bkshuf b2sum; then |
| 157 | displayMissing; |
| 158 | die "FATAL:Missing apps."; |
| 159 | fi; |
| 160 | return 1; |
| 161 | }; # check dependencies |
| 162 | checkInt() { |
| 163 | # Desc: Checks if arg is integer |
| 164 | # Usage: checkInt arg |
| 165 | # Input: arg: integer |
| 166 | # Output: - return code 0 (if arg is integer) |
| 167 | # - return code 1 (if arg is not integer) |
| 168 | # Example: if ! checkInt $arg; then echo "not int"; fi; |
| 169 | # Version: 0.0.1 |
| 170 | local returnState |
| 171 | |
| 172 | #===Process Arg=== |
| 173 | if [[ $# -ne 1 ]]; then |
| 174 | die "ERROR:Invalid number of arguments:$#"; |
| 175 | fi; |
| 176 | |
| 177 | RETEST1='^[0-9]+$'; # Regular Expression to test |
| 178 | if [[ ! $1 =~ $RETEST1 ]] ; then |
| 179 | returnState="false"; |
| 180 | else |
| 181 | returnState="true"; |
| 182 | fi; |
| 183 | |
| 184 | #===Determine function return code=== |
| 185 | if [ "$returnState" = "true" ]; then |
| 186 | return 0; |
| 187 | else |
| 188 | return 1; |
| 189 | fi; |
| 190 | } # Checks if arg is integer |
| 191 | read_stdin() { |
| 192 | # Desc: Consumes stdin; outputs as stdout lines |
| 193 | # Input: stdin (consumes) |
| 194 | # Output: stdout (newline delimited) |
| 195 | # Example: printf "foo\nbar\n" | read_stdin |
| 196 | # Depends: GNU bash (version 5.1.16) |
| 197 | # Version: 0.0.1 |
| 198 | local input_stdin output; |
| 199 | |
| 200 | # Store stdin |
| 201 | if [[ -p /dev/stdin ]]; then |
| 202 | input_stdin="$(cat -)"; |
| 203 | fi; |
| 204 | |
| 205 | # Store as output array elements |
| 206 | ## Read in stdin |
| 207 | if [[ -n $input_stdin ]]; then |
| 208 | while read -r line; do |
| 209 | output+=("$line"); |
| 210 | done < <(printf "%s\n" "$input_stdin"); |
| 211 | fi; |
| 212 | |
| 213 | # Print to stdout |
| 214 | printf "%s\n" "${output[@]}"; |
| 215 | }; # read stdin to stdout lines |
| 216 | read_psarg() { |
| 217 | # Desc: Reads arguments; outputs as stdout lines |
| 218 | # Input: args |
| 219 | # Output: stdout (newline delimited) |
| 220 | # Example: read_psarg "$@" |
| 221 | # Depends: GNU bash (version 5.1.16) |
| 222 | # Version: 0.0.1 |
| 223 | local input_psarg output; |
| 224 | |
| 225 | # Store arguments |
| 226 | if [[ $# -gt 0 ]]; then |
| 227 | input_psarg="$*"; |
| 228 | fi; |
| 229 | |
| 230 | # Store as output array elements |
| 231 | ## Read in positional arguments |
| 232 | if [[ -n $input_psarg ]]; then |
| 233 | for arg in "$@"; do |
| 234 | output+=("$arg"); |
| 235 | done; |
| 236 | fi; |
| 237 | |
| 238 | # Print to stdout |
| 239 | printf "%s\n" "${output[@]}"; |
| 240 | }; # read positional argument to stdout lines |
| 241 | find_flist() { |
| 242 | # Desc: print file list to stdout via `find` using script parameters |
| 243 | # Input: arg1: path to dir |
| 244 | # var: find_depth |
| 245 | # var: pattern_find_iregex |
| 246 | # var: find_size |
| 247 | if [[ ! -d "$1" ]]; then return 1; fi; |
| 248 | must find "$1" -maxdepth "$fdepth" -type f -iregex "$firegex" -size +"$fsize"; |
| 249 | }; # print file list to stdout from dir with script parameters |
| 250 | save_sample() { |
| 251 | # Usage: save_sample arg1 |
| 252 | # Input: arg1 list_paths (list of files to take samples from) |
| 253 | # envvar BKFEH_SAMPLE_DIR (environment variable set outside of this script) |
| 254 | # envvar BKFEH_SAMPLE_SIZE (space limit for sample dir files) |
| 255 | # Depends: GNU Parallel, GNU find, GNU Coreutils 8.32 (cut, find, du) |
| 256 | # BK-2020-03: bkshuf (0.0.1), yell() |
| 257 | local list_paths |
| 258 | sample_count="100"; # max number of images to put in sample dir |
| 259 | sample_max_space="10000000"; # max bytes to put in sample dir |
| 260 | |
| 261 | # Load environment variables if set |
| 262 | if [[ ! -v BKFEH_SAMPLE_DIR ]]; then return 0; fi; # return early if environment var not set. |
| 263 | if [[ -v BKFEH_SAMPLE_SIZE ]] && checkInt "$BKFEH_SAMPLE_SIZE"; then |
| 264 | sample_max_space="$BKFEH_SAMPLE_SIZE"; |
| 265 | fi; |
| 266 | if [[ -v BKFEH_SAMPLE_COUNT ]] && checkInt "$BKFEH_SAMPLE_COUNT"; then |
| 267 | sample_count="$BKFEH_SAMPLE_COUNT"; |
| 268 | fi; |
| 269 | |
| 270 | if [[ -n "$1" ]]; then |
| 271 | list_paths="$1"; # newline-delimited list of file paths to sample from |
| 272 | else |
| 273 | yell "ERROR:NO paths available to sample."; |
| 274 | fi; |
| 275 | |
| 276 | if [[ -d "$BKFEH_SAMPLE_DIR" ]]; then |
| 277 | #sample_dir="$BKFEH_SAMPLE_DIR"; |
| 278 | yell "STATUS:Environment variable BKFEH_SAMPLE_DIR set. Clearing and saving samples..."; |
| 279 | |
| 280 | ## clear previous sample |
| 281 | count_prev_samples="$(find "$BKFEH_SAMPLE_DIR" -maxdepth 1 -type f | wc -l)"; |
| 282 | yell "STATUS:Deleting $count_prev_samples previous samples..."; |
| 283 | find "$BKFEH_SAMPLE_DIR" -maxdepth 1 -type f -exec rm '{}' \; ; |
| 284 | |
| 285 | ## save random sample |
| 286 | yell "STATUS:Saving random sample of size $sample_count to $BKFEH_SAMPLE_DIR..."; |
| 287 | list_paths_sample="$(echo "$list_paths" | bkshuf "$sample_count" | head -n"$sample_count")"; |
| 288 | n_samp=0; # init sample file counter |
| 289 | sample_log="$BKFEH_SAMPLE_DIR"/paths.txt; |
| 290 | printf "%s,%s,%s\n" "n_samp" "file_hash" "file_path" >> "$sample_log"; |
| 291 | while read -r line; do |
| 292 | if [[ -z "$line" ]]; then continue; fi; |
| 293 | ### check size limit |
| 294 | sample_act_space="$(du -bd1 "$BKFEH_SAMPLE_DIR" | cut -f1 )"; # actual used space |
| 295 | cand_space="$(du -bd1 "$line" | cut -f1 )"; # size of candidate file to add |
| 296 | sample_req_space="$((sample_act_space + cand_space))"; |
| 297 | |
| 298 | ### Customize file names |
| 299 | n_samp_w="$(printf "%s" "$sample_count" | wc -c)"; |
| 300 | n_samp_fmt="%0""$n_samp_w""d"; |
| 301 | n_samp_dd="$(printf "$n_samp_fmt" "$n_samp")"; # sample number fixed-width |
| 302 | file_path="$line"; |
| 303 | #file_dir="$(dirname "$line")"; |
| 304 | file_name="$(basename "$line")"; |
| 305 | file_hash="$(b2sum -l32 "$line" | awk '{print $1}')"; # use file hash to avoid clobbering |
| 306 | file_ext="${file_name##*.}"; |
| 307 | file_name="${file_name%.*}"; |
| 308 | file_shortname="${file_name:0:32}"; |
| 309 | file_name_new="$n_samp_dd"_"$file_hash".."$file_shortname"."$file_ext"; |
| 310 | file_path_new="$BKFEH_SAMPLE_DIR"/"$file_name_new" |
| 311 | if [[ "$sample_req_space" -lt "$sample_max_space" ]]; then |
| 312 | #### add file to sample dir |
| 313 | must cp -n "$file_path" "$file_path_new"; |
| 314 | #### note path in sample dir log |
| 315 | printf "%s,%s,%s\n" "$n_samp_dd" "$file_hash" "$file_path" \ |
| 316 | >> "$sample_log"; |
| 317 | fi; |
| 318 | ((n_samp++)); |
| 319 | done < <( echo "$list_paths_sample" ); |
| 320 | else |
| 321 | yell "ERROR:Does not exist: $BKFEH_SAMPLE_DIR"; |
| 322 | fi; |
| 323 | }; # save sample of files |
| 324 | |
| 325 | main() { |
| 326 | # Depends: read_stdin_psarg() v0.0.1, check_depends() |
| 327 | local re_dotfile; |
| 328 | declare -a dirs_stdin dirs_psarg; |
| 329 | declare -a paths_images; |
| 330 | declare list_paths_images; |
| 331 | check_depends; |
| 332 | |
| 333 | #Populate dirs_stdin and dirs_psarg arrays |
| 334 | ## Read stdin as lines |
| 335 | re_dotfile="^\."; # first char is a dot |
| 336 | while read -r line; do |
| 337 | line="$(readlink -e "$line")"; |
| 338 | # Check if dir |
| 339 | if [[ ! -d "$line" ]]; then |
| 340 | echo "ERROR:Not a dir:$line" 1>&2; |
| 341 | continue; |
| 342 | fi; |
| 343 | dir_name="$(basename "$line")"; |
| 344 | # Exclude dotdirs |
| 345 | if [[ "$dir_name" =~ $re_dotfile ]]; then |
| 346 | echo "ERROR:Is a dotdir:$line" 1>&2; |
| 347 | continue |
| 348 | fi; |
| 349 | dirs_stdin+=("$line"); |
| 350 | done < <(read_stdin); |
| 351 | ## Read positional arguments as lines |
| 352 | re_dotfile="^\."; # first char is a dot |
| 353 | while read -r line; do |
| 354 | line="$(readlink -e "$line")"; |
| 355 | # Check if dir |
| 356 | if [[ ! -d "$line" ]]; then |
| 357 | echo "ERROR:Not a dir:$line" 1>&2; |
| 358 | continue; |
| 359 | fi; |
| 360 | dir_name="$(basename "$line")"; |
| 361 | # Exclude dotdirs |
| 362 | if [[ "$dir_name" =~ $re_dotfile ]]; then |
| 363 | echo "ERROR:Is a dotdir:$line" 1>&2; |
| 364 | continue |
| 365 | fi; |
| 366 | dirs_psarg+=("$line"); |
| 367 | done < <(read_psarg "$@"); |
| 368 | |
| 369 | # Catch all arrays empty |
| 370 | if [[ "${#dirs_stdin[@]}" -le 0 ]] && [[ "${#dirs_psarg[@]}" -le 0 ]]; then |
| 371 | die "FATAL:No valid directories provided."; |
| 372 | fi; |
| 373 | |
| 374 | # Generate file list |
| 375 | # Find settings |
| 376 | firegex=".+\(jpg\|jpeg\|gif\|png\|webm\)$"; # update according to `find . -type f | grep -Eo "\.([[:alnum:]])+$" | sort -u` |
| 377 | fsize="10k"; # default: minimum "10k" |
| 378 | export firegex fsize ; # export for parallel |
| 379 | ## Call find_filelist() in parallel for positional argument input |
| 380 | if [[ "${#dirs_psarg[@]}" -gt 0 ]]; then |
| 381 | fdepth=10; export fdepth; # 10 for dirs from positional arguments |
| 382 | paths_images+=("$( parallel find_flist {} "$fdepth" "$firegex" "$fsize" ::: "${dirs_psarg[@]}" )"); # See [1] |
| 383 | fi; |
| 384 | ## Call find_filelist() in parallel for stdin input |
| 385 | if [[ "${#dirs_stdin[@]}" -gt 0 ]]; then |
| 386 | fdepth=1; export fdepth; # 1 ofr dirs from stdin |
| 387 | paths_images+=("$( parallel find_flist {} "$fdepth" "$firegex" "$fsize" ::: "${dirs_stdin[@]}" )"); # See [1] |
| 388 | fi; |
| 389 | |
| 390 | # Convert paths_images array into file list |
| 391 | for i in "${!paths_images[@]}"; do |
| 392 | list_paths_images="$(printf "%s\n%s" "${paths_images[$i]}" "$list_paths_images")"; |
| 393 | |
| 394 | # Get stats |
| 395 | file_count="$(wc -l < <(echo -n "$list_paths_images"))"; |
| 396 | echo "$DEBUG:file_count:$file_count" |
| 397 | done; |
| 398 | |
| 399 | # Sort, remove duplicate paths |
| 400 | list_paths_images="$(echo "$list_paths_images" | sort -u | tr -s '\n')"; |
| 401 | |
| 402 | # Remove paths with dotfiles |
| 403 | list_paths_images="$(echo "$list_paths_images" | grep -viE "/\." )"; |
| 404 | |
| 405 | # Write |
| 406 | list_paths_images_tmp="/dev/shm/$(date +%Y%m%dT%H%M%S.%N%z)"..feh_paths.txt; |
| 407 | must echo -n "$list_paths_images" > "$list_paths_images_tmp"; |
| 408 | |
| 409 | # Print stats |
| 410 | yell "STATUS:Built file list in $SECONDS seconds."; |
| 411 | |
| 412 | # Run feh with filelist |
| 413 | feh --full-screen --auto-zoom --draw-filename --filelist "$list_paths_images_tmp" && \ |
| 414 | must rm "$list_paths_images_tmp" & |
| 415 | |
| 416 | # Save sample to path in env. var. BKFEH_SAMPLE_DIR if set |
| 417 | save_sample "$list_paths_images"; |
| 418 | |
| 419 | }; |
| 420 | export -f yell die must read_stdin read_psarg find_flist; |
| 421 | #==END Define local functions== |
| 422 | |
| 423 | main "$@"; |
| 424 | |
| 425 | # Author: Steven Baltakatei Sandoval |
| 426 | # License: GPLv3+ |