feat(u/bkfeh):Accept sample dir size and file count via envvar

diff --git a/user/bkfeh b/user/bkfeh
index c0410ef06308dc36f2e13012a344278208c5e742..0f8154ae2c50b2eb8f7c6e705c5b16ef09d8be20 100755 (executable)
--- a/user/bkfeh
+++ b/user/bkfeh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-# Version: 0.1.0
+# Desc: Wrapper for feh that accepts directory paths via posargs or stdin lines.
+# Version: 0.2.0
 # 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
 
@@ -155,6 +156,35 @@ check_depends() {
     if ! checkapp feh parallel; then displayMissing; die "FATAL:Missing apps."; fi;
     return 1;
 }; # check dependencies
+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
 read_stdin() {
     # Desc: Consumes stdin; outputs as stdout lines
     # Input: stdin (consumes)
@@ -218,12 +248,20 @@ save_sample() {
     # Usage: save_sample arg1
     # Input: arg1   list_paths        (list of files to take samples from)
     #        envvar BKFEH_SAMPLE_DIR  (environment variable set outside of this script)
+    #        envvar BKFEH_SAMPLE_SIZE (space limit for sample dir files)
     # Depends: yell(), GNU Parallel, GNU find, GNU Coreutils 8.32 (cut, find, du)
     local list_paths
-    sample_count="100";
-    sample_max_space="100000000"; # bytes
-    
+    sample_count="100"; # max number of images to put in sample dir
+    sample_max_space="10000000"; # max bytes to put in sample dir
+
+    # Load environment variables if set
     if [[ ! -v BKFEH_SAMPLE_DIR ]]; then return 0; fi; # return early if environment var not set.
+    if [[ -v BKFEH_SAMPLE_SIZE ]] && checkInt "$BKFEH_SAMPLE_SIZE"; then
+        sample_max_space="$BKFEH_SAMPLE_SIZE";
+    fi;
+    if [[ -v BKFEH_SAMPLE_COUNT ]] && checkInt "$BKFEH_SAMPLE_COUNT"; then
+        sample_count="$BKFEH_SAMPLE_COUNT";
+    fi;
     
     if [[ ! -z "$1" ]]; then
         list_paths="$1"; # newline-delimited list of file paths to sample from
@@ -341,17 +379,17 @@ main() {
     # Write
     list_paths_images_tmp="/dev/shm/$(date +%Y%m%dT%H%M%S.%N%z)"..feh_paths.txt;
     must echo -n "$list_paths_images" > "$list_paths_images_tmp";
-    ## Save sample to path in env. var. BKFEH_SAMPLE_DIR if set
-    save_sample "$list_paths_images";
 
     # Print stats
     yell "STATUS:Built file list in $SECONDS seconds.";
 
     # Run feh with filelist
-    feh --full-screen --auto-zoom --draw-filename --filelist "$list_paths_images_tmp";
+    feh --full-screen --auto-zoom --draw-filename --filelist "$list_paths_images_tmp" && \
+        must rm "$list_paths_images_tmp" &
 
-    # Cleanup
-    must rm "$list_paths_images_tmp";
+    # Save sample to path in env. var. BKFEH_SAMPLE_DIR if set
+    save_sample "$list_paths_images";
+    
 };
 export -f yell die must read_stdin read_psarg find_flist;
 #==END Define local functions==