avoid double call when .profile source .bashrc and vice-versa

profile.sh

@@ -73,6 +73,29 @@ _profile_install_in_file()
     return 0
 }
 
+# Detect whether $rc_file sources the file whose basename is $target_name.
+# Returns 0 (true) if a sourcing statement referencing $target_name is found,
+# ignoring commented-out lines.
+_profile_file_sources()
+{
+    local rc_file="$1"
+    local target_name="$2"
+    local line
+
+    [[ -f "$rc_file" ]] || return 1
+
+    while IFS= read -r line || [[ -n "$line" ]]; do
+        # Strip comments so commented-out source lines are not matched.
+        line="${line%%#*}"
+        # Keep only lines whose first word is a source command (`source` or `.`).
+        [[ "$line" =~ ^[[:space:]]*(source|\.)[[:space:]] ]] || continue
+        # Match if the sourcing statement references the target file.
+        [[ "$line" == *"$target_name"* ]] && return 0
+    done < "$rc_file"
+
+    return 1
+}
+
 _profile_install()
 {
     local install_bashrc=0
@@ -108,6 +131,19 @@ _profile_install()
         install_profile=1
     fi
 
+    # Avoid double loading when both targets are selected and one already
+    # sources the other: only configure the called file so profile.sh is
+    # loaded exactly once.
+    if (( install_bashrc == 1 && install_profile == 1 )); then
+        if _profile_file_sources "$HOME/.bashrc" ".profile"; then
+            printf "[ Info ] ~/.bashrc sources ~/.profile; configuring only ~/.profile to avoid double loading.\n"
+            install_bashrc=0
+        elif _profile_file_sources "$HOME/.profile" ".bashrc"; then
+            printf "[ Info ] ~/.profile sources ~/.bashrc; configuring only ~/.bashrc to avoid double loading.\n"
+            install_profile=0
+        fi
+    fi
+
     script_dir=$(dirname "$(realpath -s "${BASH_SOURCE[0]}")")
     source_line="source \"$script_dir/profile.sh\""
 
@@ -409,7 +445,7 @@ if [[ $INTERACTIVE ]]; then
 fi
 
 # Cleanup
-unset -f _profile_is_sourced _profile_finish _profile_install_in_file _profile_install
+unset -f _profile_is_sourced _profile_finish _profile_install_in_file _profile_file_sources _profile_install
 unset -f parse_conf load_alias load_conf
 unset -f pathremove pathprepend pathappend