use catall function instead of a oneliner

.config/fish/conf.d/abbr_arch.fish

@@ -5,7 +5,7 @@ abbr vs "codium ."
 abbr xclip "xclip -selection clipboard"
 abbr spotx "bash -c 'bash <(curl -sSL https://spotx-official.github.io/run.sh) -ce'"
 abbr rm "trash -f"
-abbr catall "find . \( -name '*.ext1' -o -name '*.ext2' \) -exec echo "File: {}" \; -exec cat {} \; | xclip -selection clipboard"
+abbr catall "catall .*ext1 .*ext2 | xclip -selection clipboard"
 abbr ll "eza --git --icons -gl"
 abbr la "eza --git --icons -gla"
 abbr pdf "firefox *.pdf & disown"

.config/fish/conf.d/abbr_wsl.fish

@@ -3,6 +3,6 @@ abbr unison "unison ~/src ~/u_dest"
 abbr vs "code ."
 abbr wgcc x86_64-w64-mingw32-gcc
 abbr rm "rm -rf"
-abbr catall "find . \( -name '*.ext1' -o -name '*.ext2' \) -exec echo "File `{}`:" \; -exec cat {} \; | clip.exe"
+abbr catall "catall .*ext1 .*ext2 | clip.exe"
 abbr ll "eza --git -gl"
 abbr la "eza --git -gla"

.config/fish/functions/catall.fish

@@ -0,0 +1,28 @@
+function catall2 --description "Print recursively multiple files."
+    # Get function name
+    set current_name $(status current-function)
+
+    # Check if no arguments were provided, or if the first argument is '--help'
+    if test -z $argv[2] || test "$argv[1]" = --help || test "$argv[1]" = -h
+        echo -e "Usage: $current_name <directory> exts ..."
+        echo -e "  $current_name [-h|--help] \t\t\t - Show this help message"
+        echo -e "  $current_name <directory> *.c \t\t - Cat all .C files"
+        echo -e "  $current_name <directory> *.c *.h ... \t - Cat .C and .H files, etc."
+        return 0
+    end
+
+    # Define directory
+    set directory $argv[1]
+
+    # Define extensions
+    set exts -name "$argv[2]"
+    for ext in $argv[3..-1]
+        set -a exts -o -name "$ext"
+    end
+
+    # Extra args for better printing
+    set args -exec echo -e "File: {}" \; -exec cat {} \; -exec echo "" \;
+
+    # Print files
+    find $directory \( $exts \) $args
+end