archive : add prune to delete old versions.

.README.md

@@ -316,6 +316,7 @@ Command|Description
 `archive_fast [FILES]`|Like normal `archive` but with minimal compression.
 `archive_check [ARCHIVES]`|Check specified archives or all archives in current directory.
 `archive_name [ARCHIVES] [NAME]`|Rename specified archive ro specified name or simplify name for specified archive or simplify names for all archives.
+`archive_prune [NAME]`|Delete old versions of an archive, or all archives by default.
 `unarchive [ARCHIVES]`|Check specified or all archives and extract if they are correct.
 
 ## Autocomplete.

.config/bash/module/archive.sh

@@ -124,6 +124,33 @@ archive_check()
   fi
 }
 
+# Delete old versions of an archives.
+# Usage: archive_prune [NAME]
+archive_prune()
+{
+  local targets=("${@}")
+  local count=0
+  local total=${#}
+  
+  # All archives by default.
+  if [[ "${target}" = "" ]]; then
+    targets=($(ls | grep -E ${_ARCHIVE_PATTERN}))
+    total=${#targets[@]}
+  fi
+
+  # Iterate each target.
+  for target in "${targets[@]}"; do
+    # Only work with files.
+    [[ -f "${target}" ]] || continue
+
+    # Iterate counter.
+    ((count++))
+    
+    local name="${target%_*}"
+    # local copies=("$()")
+  done
+}
+
 # extract previously created archive with checksum validation.
 # usage: unarchive [FILES]
 unarchive()
@@ -198,7 +225,7 @@ archive_name()
 
   # iterate each target.
   for target in "${targets[@]}"; do
-    # only work with targets.
+    # only work with files.
     [[ -f "${target}" ]] || continue
 
     # iterate counter.

.config/bash/module/checksum.sh

@@ -8,7 +8,7 @@ checksum()
 
   if [[ "$action" =~ ^(n|new)$  ]]; then
     # create checksums for all files.
-    find -type f | parallel sha1sum {} > "$file"
+    find -type f | parallel sha1sum {} >> "$file"
     
     # remove checksum file from resulting hashes.
     sed -i "/$file/d" "$file"