feat(user/zeropad.sh):Use find instead of ls; use bash functions

[BK-2020-03.git] / user / bk-naut-hide

#!/usr/bin/env bash
# Desc: Scan file system and update '.hidden' files to hide certain
#   files based on filenames.
# Version: 0.0.3
# Usage: bk-naut-hide [DIRS...]

yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
try() { "$@" || 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 0.1.2
    # Input: global assoc. array 'dirRollCall'
    # Output: adds/updates key(value) to global assoc array 'dirRollCall';
    # Output: returns 0 if all args are dirs; 1 otherwise
    # Depends: Bash 5.0.3
    local returnState

    #===Process Args===
    for arg in "$@"; do
	if [ -z "$arg" ]; then
	    dirRollCall["(Unspecified Dirname(s))"]="false"; returnState="false";
	elif [ -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 1.0.0
    # Input: associative arrays: appRollCall, fileRollCall, dirRollCall
    # Output: stderr: messages indicating missing apps, file, or dirs
    # Output: returns exit code 0 if nothing missing; 1 otherwise
    # 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==
    #==BEGIN Determine function return code===
    if [ "$appMissing" == "true" ] || [ "$fileMissing" == "true" ] || [ "$dirMissing" == "true" ]; then
	return 1;
    else
	return 0;
    fi
    #==END Determine function return code===
} # Display missing apps, files, dirs
get_paths_dothide() {
    # Desc: Recursively search specified ir for '.hidden' files
    # Usage: get_paths_dothide arg1
    # Input: arg1     dir to search
    # Output: stdout  list of paths of '.hidden' files

    local 
    # Check input
    if [[ $# -ne 1 ]]; then die "FATAL:Arg count does not equal 1:$#"; fi;
    if [[ ! -d "$1" ]]; then die "FATAL:Not a dir:$1"; fi;

    # Search for files named '.hidden'
    find "$1" -type f -name ".hidden" 2>/dev/null
}; # Return list of paths of '.hidden' files

main() {
    local -a dirs_target pat_tohide

    # check input
    # check and specify list of dirs to search
    for arg in "$@"; do
        if [[ -d $arg ]]; then            
            dirs_target+=("$arg");
        else
            die "FATAL:Not a dir:arg:$arg";
        fi;
    done;
    #yell "DEBUG:dirs_target:${dirs_target[*]}";
    
    # specify filename regex patterns to mark '.hidden'
    pat_tohide+=(".ots$");
    pat_tohide+=(".ots.bak$");
    #yell "DEBUG:pat_tohide:${pat_tohide[*]}";
    
    # generate list of paths of '.hidden' files
    for dir in "${dirs_target[@]}"; do
        #yell "DEBUG:generating list of paths of '.hidden' files in dir:$dir";
        while read -r file; do
            ls_dothide_f+=("$file");
        done < <(get_paths_dothide "$dir");
    done;
    #yell "DEBUG:ls_dothide_f:${ls_dothide_f[*]}";
    #yell "DEBUG:";

    # get list of dirs containing the files
    while read -r line; do
        #yell "DEBUG:found .hidden file at:$line";
        dir="$(dirname "$line")";
        ls_dothide_d+=("$dir");
    done < <(printf "%s\n" "${ls_dothide_f[@]}")
    #yell "DEBUG:ls_dothide_d:${ls_dothide_d[*]}";
    #yell "DEBUG:";

    # for each dir, write list of files to hide in '.hidden'
    while read -r dir; do
        #yell "DEBUG:performing actions in dir:$dir";
        declare -a ls_tohide_fn; # array for filenames to write in '.hidden'

        ## act on each file
        while read -r file; do
            #yell "DEBUG:considering file:$file";
            filename="$(basename "$file")";
            
            ## check if file is actually a file
            if [[ ! -f $file ]]; then continue; fi;            

            ## check if file should be hidden according to pattern match
            unset flag_pat_match;
            while read -r pat; do
                if [[ $filename =~ $pat ]]; then
                    flag_pat_match="true";
                    break; # don't consider any more patterns for this file
                else
                    flag_pat_match="false";
                fi;
            done < <(printf "%s\n" "${pat_tohide[@]}");

            ## add file to list to add to '.hidden'
            if [[ $flag_pat_match == "true" ]]; then
                #yell "DEBUG:adding to ls_tohide_fn:file:$file":
                #yell "DEBUG:filename:$filename";
                ls_tohide_fn+=("$filename");
            fi;
            #yell "DEBUG:";

            ## unset variables defined only for this file
            unset filename flag_pat_match;
        done < <(find "$dir" -mindepth 1 -maxdepth 1 -type f 2>/dev/null);
        #yell "DEBUG:";

        ## add file names to $dir/'.hidden'
        ### remove blank lines and sort and uniq
        while read -r line; do
              ls_tohide_fn_sortuniq+=("$line");
        done < <(printf "%s\n" "${ls_tohide_fn[@]}" | sed '/^$/d' | sort | uniq);
        ls_tohide_fn=("${ls_tohide_fn_sortuniq[@]}");
        
        ### write '.hidden'
        path_hidefile="$dir"/.hidden;
        #yell "DEBUG:Writing contents of .hidden file at path_hidefile:$path_hidefile";
        #yell "DEBUG:ls_tohide_fn:$(printf "%s\n" "${ls_tohide_fn[@]}" )";
        printf "%s\n" "${ls_tohide_fn[@]}" > "$path_hidefile"

        ## unset variables defined only for this dir
        unset ls_tohide_fn path_hidefile;
        
        #yell "DEBUG:";
    done < <(printf "%s\n" "${ls_dothide_d[@]}");
}; # main program

main "$@";