feat(user/list_large_dirs.sh):Add script

diff --git a/user/list_large_dirs.sh b/user/list_large_dirs.sh
new file mode 100755 (executable)
index 0000000..240ba3c
--- /dev/null
+++ b/user/list_large_dirs.sh
@@ -0,0 +1,264 @@
+#!/usr/bin/env bash
+# Desc: Lists directories immediately containing large amounts of data
+# Usage: script.sh [int megabytes] [dir]
+# Example: A directory named `vacation_photos` located somewhere in $HOME/
+#   containing more than 100MB of files (without checking subdirectories of
+#   `vacation_photos`) could be found by running:
+#   $ script.sh 100 "$HOME"
+#   /home/johndoe/Pictures/unsorted/notjunk/vacation_photos
+# Version: 0.0.1
+
+declare -Ag appRollCall # Associative array for storing app status
+declare -Ag fileRollCall # Associative array for storing file status
+declare -Ag dirRollCall # Associative array for storing dir status
+
+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
+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
+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: 0.1.2
+    # 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;
+        elif [ -z "$arg" ]; then
+            fileRollCall["(no name)"]="false"; returnState="false";
+       else
+           fileRollCall["$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
+check_depends() {
+    local flag_return=0;
+
+    if ! checkapp du; then flag_return="1"; fi;
+    return "$flag_return";
+}; # returns 1 if missing dependencies
+size_dir_contents() {
+    # usage: size_dir_contents [path]
+    # depends: find, du
+    local bytes re;
+
+    bytes=0;
+    re="^[0-9]+$";
+
+    #yell "DEBUG:Checking dir:$1";
+    while read -r addend; do
+        #yell "DEBUG:addend:$addend";
+        if [[ $addend =~ $re ]]; then
+            bytes="$((bytes + addend))";
+        fi;
+    done < <( find "$1" -maxdepth 1 -type f -exec du -b --summarize '{}' \; | cut -f1 );
+    
+    echo "$bytes" && return 0;
+}; # return size of dir immediate contents
+main() {
+    #size_large="100000000"; # 100 MB
+
+    #yell "DEBUG:arg1:$1"; # debug
+    #yell "DEBUG:arg2:$2"; # debug
+
+    # check dependencies
+    if ! check_depends; then die "FATAL:Missing dependencies."; fi;
+    
+    # check args
+    if ! checkInt "$1"; then
+        die "FATAL:Not an int:$1";
+    else
+        size_l_mb="$1"
+        size_l_b="$(( size_l_mb * 1000000 ))";
+    fi;
+    if [[ ! -d "$2" ]]; then
+        die "FATAL:Not a dir:$2";
+    else
+        dir_in="$2";
+    fi;
+
+    # check each dir size contents
+    while IFS= read -r -d $'\0' pathdir; do
+        #yell "DEBUG:Checking:pathdir:$pathdir"; # debug
+        if [[ ! -d "$pathdir" ]]; then continue; fi;
+        dir_size="$(size_dir_contents "$pathdir";)"
+        #yell "DEBUG:dir_size:$dir_size"; # debug
+        if [[ $dir_size -gt "$size_l_b" ]]; then
+            printf "%s\n" "$pathdir"; # output
+        fi;
+        #sleep 1; # debug
+    done < <(find "$dir_in" -type d -print0);
+    
+    return 0;
+};
+
+main "$@";