[BK-2020-03.git] / user / bkfeh

#!/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+
Commit	Line	Data
9eaab35f SBS	1	#!/usr/bin/env bash
	2	# Version: 0.0.3
	3	# Ref/Attrib: [1] Tange, Ole. GNU Parallel with Bash Array. 2019-03-24. https://unix.stackexchange.com/a/508365/411854
	4	# Depends: GNU Parallel, GNU Bash v5.1.16, feh 3.6.3
	5
	6	#===Declare local functions===
	7	yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
	8	die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
	9	must() { "$@" \|\| die "cannot $*"; } # runs args as command, reports args if command fails
	10	checkapp() {
	11	# Desc: If arg is a command, save result in assoc array 'appRollCall'
	12	# Usage: checkapp arg1 arg2 arg3 ...
	13	# Version: 0.1.1
	14	# Input: global assoc. array 'appRollCall'
	15	# Output: adds/updates key(value) to global assoc array 'appRollCall'
	16	# Depends: bash 5.0.3
	17	local returnState
	18
	19	#===Process Args===
	20	for arg in "$@"; do
	21	if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command
	22	appRollCall[$arg]="true";
	23	if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
	24	else
	25	appRollCall[$arg]="false"; returnState="false";
	26	fi;
	27	done;
	28
	29	#===Determine function return code===
	30	if [ "$returnState" = "true" ]; then
	31	return 0;
	32	else
	33	return 1;
	34	fi;
	35	} # Check that app exists
	36	checkfile() {
	37	# Desc: If arg is a file path, save result in assoc array 'fileRollCall'
	38	# Usage: checkfile arg1 arg2 arg3 ...
	39	# Version: 0.1.1
	40	# Input: global assoc. array 'fileRollCall'
	41	# Output: adds/updates key(value) to global assoc array 'fileRollCall';
	42	# Output: returns 0 if app found, 1 otherwise
	43	# Depends: bash 5.0.3
	44	local returnState
	45
	46	#===Process Args===
	47	for arg in "$@"; do
	48	if [ -f "$arg" ]; then
	49	fileRollCall["$arg"]="true";
	50	if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
	51	else
	52	fileRollCall["$arg"]="false"; returnState="false";
	53	fi;
	54	done;
	55
	56	#===Determine function return code===
	57	if [ "$returnState" = "true" ]; then
	58	return 0;
	59	else
	60	return 1;
	61	fi;
	62	} # Check that file exists
	63	checkdir() {
	64	# Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
65	# Usage: checkdir arg1 arg2 arg3 ...
66	# Version 0.1.1
67	# Input: global assoc. array 'dirRollCall'
68	# Output: adds/updates key(value) to global assoc array 'dirRollCall';
69	# Output: returns 0 if app found, 1 otherwise
70	# Depends: Bash 5.0.3
71	local returnState
72
73	#===Process Args===
74	for arg in "$@"; do
75	if [ -d "$arg" ]; then
76	dirRollCall["$arg"]="true";
77	if ! [ "$returnState" = "false" ]; then returnState="true"; fi
78	else
79	dirRollCall["$arg"]="false"; returnState="false";
80	fi
81	done
82
83	#===Determine function return code===
84	if [ "$returnState" = "true" ]; then
85	return 0;
86	else
87	return 1;
88	fi
89	} # Check that dir exists
90	displayMissing() {
91	# Desc: Displays missing apps, files, and dirs
92	# Usage: displayMissing
93	# Version 0.1.1
94	# Input: associative arrays: appRollCall, fileRollCall, dirRollCall
95	# Output: stderr: messages indicating missing apps, file, or dirs
96	# Depends: bash 5, checkAppFileDir()
97	local missingApps value appMissing missingFiles fileMissing
98	local missingDirs dirMissing
99
100	#==BEGIN Display errors==
101	#===BEGIN Display Missing Apps===
102	missingApps="Missing apps :";
103	#for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
104	for key in "${!appRollCall[@]}"; do
105	value="${appRollCall[$key]}";
106	if [ "$value" = "false" ]; then
107	#echo "DEBUG:Missing apps: $key => $value";
108	missingApps="$missingApps""$key ";
109	appMissing="true";
110	fi;
111	done;
112	if [ "$appMissing" = "true" ]; then # Only indicate if an app is missing.
113	echo "$missingApps" 1>&2;
114	fi;
115	unset value;
116	#===END Display Missing Apps===
117
118	#===BEGIN Display Missing Files===
119	missingFiles="Missing files:";
120	#for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done
121	for key in "${!fileRollCall[@]}"; do
122	value="${fileRollCall[$key]}";
123	if [ "$value" = "false" ]; then
124	#echo "DEBUG:Missing files: $key => $value";
125	missingFiles="$missingFiles""$key ";
126	fileMissing="true";
127	fi;
128	done;
129	if [ "$fileMissing" = "true" ]; then # Only indicate if an app is missing.
130	echo "$missingFiles" 1>&2;
131	fi;
132	unset value;
133	#===END Display Missing Files===
134
135	#===BEGIN Display Missing Directories===
136	missingDirs="Missing dirs:";
137	#for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done
138	for key in "${!dirRollCall[@]}"; do
139	value="${dirRollCall[$key]}";
140	if [ "$value" = "false" ]; then
141	#echo "DEBUG:Missing dirs: $key => $value";
142	missingDirs="$missingDirs""$key ";
143	dirMissing="true";
144	fi;
145	done;
146	if [ "$dirMissing" = "true" ]; then # Only indicate if an dir is missing.
147	echo "$missingDirs" 1>&2;
148	fi;
149	unset value;
150	#===END Display Missing Directories===
151
152	#==END Display errors==
153	} # Display missing apps, files, dirs
154	check_depends() {
155	if ! checkapp feh parallel; then displayMissing; die "FATAL:Missing apps."; fi;
156	return 1;
157	}; # check dependencies
158	read_stdin_psarg() {
159	# Desc: Consumes stdin and reads arguments; outputs as stdout lines
160	# Input: stdin (consumes)
161	# Input: args
162	# Output: stdout (newline delimited)
163	# Example: read_stdin_psarg "$@"
164	# Depends: GNU bash (version 5.1.16)
165	# Version: 0.0.1
166	local input_stdin input_psarg output;
167
168	# Store stdin
169	if [[ -p /dev/stdin ]]; then
170	input_stdin="$(cat -)";
171	fi;
172
173	# Store arguments
174	if [[ $# -gt 0 ]]; then
175	input_psarg="$@";
176	fi;
177
178	# Combine as output array elements
179	## Read in stdin
180	if [[ -n $input_stdin ]]; then
181	while read -r line; do
182	output+=("$line");
183	done < <(printf "%s\n" "$input_stdin");
184	fi;
185	## Read in positional arguments
186	if [[ -n $input_psarg ]]; then
187	for arg in "$@"; do
188	output+=("$arg");
189	done;
190	fi;
191
192	# Print to stdout
193	printf "%s\n" "${output[@]}";
194	}; # read stdin and positional argument to stdout lines
195	print_filelist() {
196	# Desc: print file list to stdout via `find` using script parameters
197	# Input: arg1: path to dir
198	# var: find_depth
199	# var: pattern_find_iregex
200	# var: find_size
201	if [[ ! -d "$1" ]]; then return 1; fi;
202	must find "$1" -maxdepth "$find_depth" -type f -iregex "$pattern_find_iregex" -size +"$find_size";
203	}; # print file list to stdout from dir with script parameters
204	main() {
205	# Depends: read_stdin_psarg() v0.0.1, check_depends()
206	declare -a main_dirs;
207	declare -a paths_images;
208	declare list_paths_images;
209	check_depends;
210
211	# Find settings
212	find_depth=10; # default: 10
213	find_size="10k"; # default: minimum "10k"
214	#Find files ending in .jpg, .gif, etc.
215	pattern_find_iregex=".+\(jpg\\|jpeg\\|gif\\|png\\|webm\)$"; # update according to `find . -type f \| grep -Eo "\.([[:alnum:]])+$" \| sort -u`
216	export find_depth find_size pattern_find_iregex; # export for parallel
217
218	#Populate main_dirs array
219	## Read stdin and positional arguments as lines
220	while read -r line; do
221	if [[ ! -d "$line" ]]; then
222	echo "ERROR:Not a dir:$line" 1>&2;
223	continue;
224	fi;
225	main_dirs+=("$line");
226	done < <(read_stdin_psarg "$@");
227
228	# Generate file list
229	paths_images+=("$( parallel print_filelist {} ::: "${main_dirs[@]}" )"); # See [1]
230
231	# Convert paths_images array into file list
232	for i in "${!paths_images[@]}"; do
233	list_paths_images="$(printf "%s\n%s" "${paths_images[$i]}" "$list_paths_images")";
234
235	# Get stats
236	file_count="$(wc -l < <(echo -n "$list_paths_images"))";
237	echo "$DEBUG:file_count:$file_count"
238	done;
239
240	# Sort and remove duplicates
241	list_paths_images="$(echo "$list_paths_images" \| sort -u \| tr -s '\n')";
242
243	# Write
244	list_paths_images_tmp="/dev/shm/$(date +%Y%m%dT%H%M%S.%N%z)"..feh_paths.txt;
245	must echo -n "$list_paths_images" > "$list_paths_images_tmp";
246
247	# Print stats
248	yell "STATUS:Built file list in $SECONDS seconds.";
249
250	# Run feh with filelist
251	feh --full-screen --auto-zoom --draw-filename --filelist "$list_paths_images_tmp";
252
253	# Cleanup
254	must rm "$list_paths_images_tmp";
255	};
256	export -f yell die must read_stdin_psarg print_filelist;
257	#==END Define local functions==
258
259	main "$@";
260
261	# Author: Steven Baltakatei Sandoval
262	# License: GPLv3+