improvement: adding attachments

src/main.sh

@@ -918,19 +918,29 @@ __tentative_toggle() {
 # @req $AWK_ATTACH: Awk script to add attachment
 __add_attachment() {
   fpath="$ROOT/$1"
-  f=$(
+  sel=$(
     $FZF --prompt="Select attachment> " \
       --walker="file,hidden" \
-      --walker-root="$HOME"
+      --walker-root="$HOME" \
+      --expect="ctrl-c,ctrl-g,ctrl-q,esc"
   )
+  key=$(echo "$sel" | head -1)
+  f=$(echo "$sel" | tail -1)
+  if [ -n "$key" ]; then
+    f=""
+  fi
   if [ -z "$f" ] || [ ! -f "$f" ]; then
     return
   fi
   filename=$(basename "$f")
+  mime=$(file -b -i "$f" | cut -d ';' -f 1)
+  if [ -z "$mime" ]; then
+    mime="application/octet-stream"
+  fi
   fenc=$(mktemp)
   base64 "$f" >"$fenc"
   filetmp=$(mktemp)
-  awk -v file="$fenc" -v mime="application/octet-stream" -v filename="$filename" "$AWK_ATTACH" "$fpath" >"$filetmp"
+  awk -v file="$fenc" -v mime="$mime" -v filename="$filename" "$AWK_ATTACH" "$fpath" >"$filetmp"
   mv "$filetmp" "$fpath"
   if [ -n "${GIT:-}" ]; then
     $GIT add "$fpath"