feat(user/bkfeh):Add wrapper for feh

- Note: accepts dirs via stdin or positional arguments. Uses GNU
  Parallel to speed up `find` operations.

diff --git a/user/bkfeh b/user/bkfeh
new file mode 100644 (file)
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+++ b/user/bkfeh
@@ -0,0 +1,262 @@
+#!/usr/bin/env bash
+# Version: 0.0.3
+# Ref/Attrib: [1] Tange, Ole. GNU Parallel with Bash Array. 2019-03-24. https://unix.stackexchange.com/a/508365/411854
+# Depends: GNU Parallel, GNU Bash v5.1.16, feh 3.6.3
+
+#===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 "$missingDirs" 1>&2;
+    fi;
+    unset value;
+    #===END Display Missing Directories===
+
+    #==END Display errors==
+} # Display missing apps, files, dirs
+check_depends() {
+    if ! checkapp feh parallel; then displayMissing; die "FATAL:Missing apps."; fi;
+    return 1;
+}; # check dependencies
+read_stdin_psarg() {
+    # Desc: Consumes stdin and reads arguments; outputs as stdout lines
+    # Input: stdin (consumes)
+    # Input: args
+    # Output: stdout (newline delimited)
+    # Example: read_stdin_psarg "$@"
+    # Depends: GNU bash (version 5.1.16)
+    # Version: 0.0.1
+    local input_stdin input_psarg output;
+
+    # Store stdin
+    if [[ -p /dev/stdin ]]; then
+        input_stdin="$(cat -)";
+    fi;
+
+    # Store arguments
+    if [[ $# -gt 0 ]]; then
+        input_psarg="$@";
+    fi;
+
+    # Combine 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;
+    ## 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 stdin and positional argument to stdout lines
+print_filelist() {
+    # 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 "$1" -maxdepth "$find_depth" -type f -iregex "$pattern_find_iregex" -size +"$find_size";
+}; # print file list to stdout from dir with script parameters
+main() {
+    # Depends: read_stdin_psarg() v0.0.1, check_depends()
+    declare -a main_dirs;
+    declare -a paths_images;
+    declare list_paths_images;
+    check_depends;
+
+    # Find settings
+    find_depth=10; # default: 10
+    find_size="10k"; # default: minimum "10k"
+    #Find files ending in .jpg, .gif, etc.
+    pattern_find_iregex=".+\(jpg\|jpeg\|gif\|png\|webm\)$"; # update according to `find . -type f | grep -Eo "\.([[:alnum:]])+$" | sort -u`
+    export find_depth find_size pattern_find_iregex; # export for parallel
+
+    #Populate main_dirs array
+    ## Read stdin and positional arguments as lines
+    while read -r line; do
+        if [[ ! -d "$line" ]]; then
+            echo "ERROR:Not a dir:$line" 1>&2;
+            continue;
+        fi;
+        main_dirs+=("$line");
+    done < <(read_stdin_psarg "$@");
+    
+    # Generate file list
+    paths_images+=("$( parallel print_filelist {} ::: "${main_dirs[@]}" )"); # See [1]
+
+    # Convert paths_images array into file list
+    for i in "${!paths_images[@]}"; do
+        list_paths_images="$(printf "%s\n%s" "${paths_images[$i]}" "$list_paths_images")";
+
+        # Get stats
+        file_count="$(wc -l < <(echo -n "$list_paths_images"))";
+        echo "$DEBUG:file_count:$file_count"
+    done;
+
+    # Sort and remove duplicates
+    list_paths_images="$(echo "$list_paths_images" | sort -u | tr -s '\n')";
+
+    # Write
+    list_paths_images_tmp="/dev/shm/$(date +%Y%m%dT%H%M%S.%N%z)"..feh_paths.txt;
+    must echo -n "$list_paths_images" > "$list_paths_images_tmp";
+
+    # Print stats
+    yell "STATUS:Built file list in $SECONDS seconds.";
+
+    # Run feh with filelist
+    feh --full-screen --auto-zoom --draw-filename --filelist "$list_paths_images_tmp";
+
+    # Cleanup
+    must rm "$list_paths_images_tmp";
+};
+export -f yell die must read_stdin_psarg print_filelist;
+#==END Define local functions==
+
+main "$@";
+
+# Author: Steven Baltakatei Sandoval
+# License: GPLv3+