checksum : rewrite.

.README.md

@@ -657,6 +657,14 @@ Command|Description
 
 By default, umask is `077` which means group and others have no access when files are created.
 
+## Util.
+
+Short util functions.
+
+Command|Description
+---|---
+`_core_count`|Get number of available CPU threads.
+
 ## Vdl.
 
 Command|Description

.config/bash/module/checksum.sh

@@ -1,25 +1,68 @@
+# Save file checksums.
 checksum_create()
 {
-  if [[ -f .checksum ]]; then
+  local file=".checksum"
+
+  # Error if checksum already exists.
+  if [[ -f "${file}" ]]; then
     echo -e "${color_bred}Checksum already exists.${color_default}"
     return 1
   fi
 
-  find -type f | parallel -- sha1sum {} >> .checksum
-  sed -i "/\.checksum/d" .checksum
+  find -type f | parallel -j $(_core_count) -- sha1sum {} >> "${file}"
+  sed -i "/${file}/d" ${file}
 }
 
+# Check stored values against actual files.
 checksum_check()
 {
-  sha1sum --quiet -c .checksum
+  local file=".checksum"
+  local failed=0
+
+  cat "${file}" | parallel -j $(_core_count) -- _checksum_check {} || ((failed++))
+
+  if [[ ${failed} = 0 ]]; then
+    echo -e "${color_green}All successful.${color_default}"
+    return 0
+  else
+    # echo -e "${color_bred}Items failed to validate: ${failed}.${color_default}"
+    return 1
+  fi
 }
 
+# Check old values and create new one if all was fine.
 checksum_update()
 {
-  if [[ ! -f .checksum ]]; then
+  local file=".checksum"
+
+  if [[ ! -f "${file}" ]]; then
     echo -e "${color_bred}Checksum doesn't exists.${color_default}"
     return 1
   fi
 
-  checksum_check && rm .checksum && checksum_create
+  checksum_check && rm "${file}" && checksum_create
 }
+
+_checksum_check()
+{
+  local file="${1##*\ \ }"
+  local stored="${1%%\ \ *}"
+  local failed=0
+
+  # Skip if no file.
+  [[ -f "${file}" ]] || return 0
+
+  # Check file hash.
+  local actual=$(sha1sum "${file}")
+  actual="${actual%%\ \ *}"
+
+  # Compare values.
+  if [[ "${stored}" != "${actual}" ]]; then
+    echo -e "${color_bred}${file}: Failed.${color_default}"
+    return 1
+  fi
+
+  return 0
+}
+
+export -f _checksum_check

.config/bash/module/util.sh

@@ -0,0 +1,5 @@
+# Get the number of avaialble cores (threads).
+_core_count()
+{
+  cat /proc/cpuinfo | grep ^processor | wc -l
+}