fix double slash at directory name

sfm

@@ -61,7 +61,7 @@ term_rows()   { tput_cmd lines || echo 24; }
 term_cols()   { tput_cmd cols  || echo 80; }
 
 # --- state ---
-CWD="$PWD"
+CWD="$PWD"; CWD=$(cd "$CWD" 2>/dev/null && pwd) || CWD="/"
 SEL=0
 OFFSET=0
 PREV_SEL=0
@@ -82,6 +82,16 @@ SHOW_DETAILS=0   # 1 = show size+date column
 TRASH_DIR="${XDG_DATA_HOME:-$HOME/.local/share}/sfm-trash"
 mkdir -p "$TRASH_DIR"
 PREV_CWD=""     # last visited directory, for jumping back
+
+# normalise CWD: resolve to absolute canonical path, no double slashes
+norm_cwd() {
+    CWD=$(cd "$CWD" 2>/dev/null && pwd) || CWD="/"
+    # squeeze any double slashes (some systems return // for //<path>)
+    CWD=$(printf '%s' "$CWD" | tr -s '/')
+}
+
+# safely join CWD with a name, avoiding double slash at root
+joinpath() { [ "$CWD" = "/" ] && printf '/%s' "$1" || printf '%s/%s' "$CWD" "$1"; }
 BOOKMARK_FILE="${XDG_CONFIG_HOME:-$HOME/.config}/sfm/bookmarks"
 mkdir -p "$(dirname "$BOOKMARK_FILE")"
 [ -f "$BOOKMARK_FILE" ] || touch "$BOOKMARK_FILE"
@@ -873,7 +883,7 @@ do_go_back() {
     SELECTED=""
     PREV_CWD="$CWD"
     LAST_CHILD="${CWD##*/}/"   # name of current dir with trailing slash
-    CWD=$(dirname "$CWD")
+    CWD=$(cd "$(dirname "$CWD")" && pwd)
     SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0
     load_entries
     # restore selection to the directory we just came from
@@ -890,20 +900,20 @@ do_open() {
         */)
             FILTER=""
             SELECTED=""
-            _target="${CWD}/${entry%/}"
+            _target=$(joinpath "${entry%/}")
             if [ ! -x "$_target" ] || [ ! -r "$_target" ]; then
                 INFO_MSG="permission denied: ${entry%/}"
                 NEED_FULL_REDRAW=1
                 return
             fi
             PREV_CWD="$CWD"
-            CWD=$(cd "$_target" && pwd)
+            CWD=$(cd "$_target" && pwd); norm_cwd
             SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0
             load_entries
             ;;
         *@)
             _name="${entry%@}"
-            _target="${CWD}/${_name}"
+            _target=$(joinpath "$_name")
             if [ -d "$_target" ]; then
                 if [ ! -x "$_target" ] || [ ! -r "$_target" ]; then
                     INFO_MSG="permission denied: ${_name}"
@@ -912,7 +922,7 @@ do_open() {
                 fi
                 FILTER=""; SELECTED=""
                 PREV_CWD="$CWD"
-                CWD=$(cd "$_target" && pwd)
+                CWD=$(cd "$_target" && pwd); norm_cwd
                 SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0
                 load_entries
             else
@@ -1059,7 +1069,7 @@ do_shell() {
     printf '%s(type "exit" to return to fm)%s\n' "${YELLOW}" "${RESET}"
     ${SHELL:-sh}
     # restore CWD in case user cd'd around
-    CWD="${PWD}"
+    CWD="${PWD}"; norm_cwd
     setup_term; hide_cursor
     NEED_FULL_REDRAW=1
 }
@@ -1095,7 +1105,7 @@ do_trash() {
 do_open_trash() {
     PREV_CWD="$CWD"
     FILTER=""; SELECTED=""
-    CWD="$TRASH_DIR"
+    CWD="$TRASH_DIR"; norm_cwd
     SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0
     load_entries
 }
@@ -1124,7 +1134,7 @@ do_copy_path() {
 do_jump_back() {
     [ -z "$PREV_CWD" ] && { INFO_MSG="no previous directory"; NEED_FULL_REDRAW=1; return; }
     _tmp="$CWD"
-    CWD="$PREV_CWD"
+    CWD="$PREV_CWD"; norm_cwd
     PREV_CWD="$_tmp"
     FILTER=""; SELECTED=""
     SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0
@@ -1199,7 +1209,7 @@ do_bookmark_jump() {
                     '[C') # right — open
                         _chosen=$(awk -v n="$_bsel" 'NR==n&&NF{print;exit}' "$BOOKMARK_FILE")
                         if [ -n "$_chosen" ] && [ -d "$_chosen" ]; then
-                            PREV_CWD="$CWD"; CWD="$_chosen"
+                            PREV_CWD="$CWD"; CWD="$_chosen"; norm_cwd
                             FILTER=""; SELECTED=""
                             SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0
                             load_entries
@@ -1215,7 +1225,7 @@ do_bookmark_jump() {
             l)
                 _chosen=$(awk -v n="$_bsel" 'NR==n&&NF{print;exit}' "$BOOKMARK_FILE")
                 if [ -n "$_chosen" ] && [ -d "$_chosen" ]; then
-                    PREV_CWD="$CWD"; CWD="$_chosen"
+                    PREV_CWD="$CWD"; CWD="$_chosen"; norm_cwd
                     FILTER=""; SELECTED=""
                     SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0
                     load_entries
@@ -1373,7 +1383,7 @@ while true; do
         u)   do_trash        ;;
         U)   do_open_trash   ;;
         '`') do_jump_back    ;;
-        '~') PREV_CWD="$CWD"; CWD="$HOME"; FILTER=""; SELECTED=""
+        '~') PREV_CWD="$CWD"; CWD=$(cd "$HOME" && pwd); FILTER=""; SELECTED=""
              SEL=0; OFFSET=0; PREV_SEL=0; PREV_OFFSET=0; load_entries ;;
         c)   do_copy_path   ;;
         "$(printf '\033')") do_clear_filter ;;