Add suport for xsel

bashpass

@@ -110,7 +110,7 @@ PasswordAlreadyExists() {
       printf '\n'
       printf 'Do you want to overwrite the existing password [y/N]: '
       read -r overwrite
-      
+
       case "${overwrite}" in
          [Yy])
             rm -rf "${passLocation}/${name}.gpg"
@@ -139,7 +139,7 @@ RandomPassword() {
          printf 'Retype the password for %s: ' "${name}"
          read -rs password2
          printf '\n'
-         
+
          while [[ "${password1}" != "${password2}" ]]; do
             printf 'Passwords didn'\''t match, please try again: '
             read -rs password2
@@ -245,8 +245,10 @@ Show() {
 # Copy the password that was given to the clipboard.
 # Clear the clipboard afterwards.
 Copy() {
-   # Detect 'xclip'
-   command -v xclip &> /dev/null || Kill "xclip is required" "127"
+   # Detect 'xclip' or 'xsel'
+   command -v xclip &> /dev/null ||
+      command -v xsel &> /dev/null ||
+      Kill "xclip or xsel is required" "127"
 
    # Ask for a name when no name was given using ${2}.
    Name "${1}" "copy"
@@ -255,21 +257,27 @@ Copy() {
    # Ignore terminal interrupts (CTRL+C).
    trap '' INT
 
-   # Decrypte the password file and copy it to the clipboard using xclip.
+   # Decrypte the password file and copy it to the clipboard using xclip or xsel.
    # This WON'T show the password inside the terminal output.
-   if ! printf '%s' "$(gpg --decrypt --quiet "${passLocation}/${name}.gpg")" | xclip -selection clipboard; then
-      xclip -selection clipboard < /dev/null
+   if gpg --decrypt --quiet "${passLocation}/${name}.gpg" | xclip -selection clipboard 2> /dev/null; then
+      :
+   elif gpg --decrypt --quiet "${passLocation}/${name}.gpg" | xsel --clipboard 2> /dev/null; then
+      :
+   else
+      command -v xclip &> /dev/null && xclip -selection clipboard < /dev/null 
+      command -v xsel &> /dev/null && xsel --clipboard < /dev/null
       Kill "failed to copy password '${name}' to the clipboard." "1"
    fi
 
    printf 'Password %s has been copied to the clipboard' "'${name}'"
    printf '\n'
-   
+
    # Wait for the timer to end clear the clipboard.
    # 'timer' can be changed in the config file.
    Sleep "${timer}" || kill 0
-   xclip -selection clipboard < /dev/null
-
+   command -v xclip &> /dev/null && xclip -selection clipboard < /dev/null
+   command -v xsel &> /dev/null && xsel --clipboard < /dev/null
+
    printf 'Clipboard has been cleared to ensure it cannot be leaked.'
    printf '\n'
 }
@@ -278,7 +286,7 @@ Copy() {
 List() {
    # Enable globbing for only this function.
    set +f
-   
+
    # Print the list of all the passwords (without using the `ls` command).
    for p in "${passLocation}"/*.gpg; do
       # Remove the path to the file.