allow the profile to self install

profile.sh

@@ -35,10 +35,123 @@
 # * OF SUCH DAMAGE.
 # ------------------------------------------------------------------------------
 
+_profile_is_sourced()
+{
+    [[ "${BASH_SOURCE[0]}" != "$0" ]]
+}
+
+_profile_finish()
+{
+    local rc="${1:-0}"
+    if _profile_is_sourced; then
+        return "$rc"
+    fi
+    exit "$rc"
+}
+
+_profile_install_in_file()
+{
+    local rc_file="$1"
+    local source_line="$2"
+
+    [[ -f "$rc_file" ]] || touch "$rc_file" || {
+        printf "[ Error ] Cannot create %s\n" "$rc_file" >&2
+        return 1
+    }
+
+    if grep -Fqx "$source_line" "$rc_file"; then
+        printf "[ Info ] Already configured in %s\n" "$rc_file"
+        return 0
+    fi
+
+    printf "\n%s\n" "$source_line" >> "$rc_file" || {
+        printf "[ Error ] Cannot write to %s\n" "$rc_file" >&2
+        return 1
+    }
+
+    printf "[ Info ] Added profile source line to %s\n" "$rc_file"
+    return 0
+}
+
+_profile_install()
+{
+    local install_bashrc=0
+    local install_profile=0
+    local target_selected=0
+    local script_dir source_line rc=0
+
+    while [[ $# -gt 0 ]]; do
+        case "$1" in
+            --bashrc)
+                install_bashrc=1
+                target_selected=1
+                ;;
+            --profile)
+                install_profile=1
+                target_selected=1
+                ;;
+            -h|--help)
+                printf "Usage: %s --install [--bashrc] [--profile]\n" "${BASH_SOURCE[0]}"
+                printf "If no target is specified, both ~/.bashrc and ~/.profile are configured.\n"
+                return 0
+                ;;
+            *)
+                printf "[ Error ] Unknown install option: %s\n" "$1" >&2
+                return 2
+                ;;
+        esac
+        shift
+    done
+
+    if (( target_selected == 0 )); then
+        install_bashrc=1
+        install_profile=1
+    fi
+
+    script_dir=$(dirname "$(realpath -s "${BASH_SOURCE[0]}")")
+    source_line="source \"$script_dir/profile.sh\""
+
+    if (( install_bashrc == 1 )); then
+        _profile_install_in_file "$HOME/.bashrc" "$source_line" || rc=$?
+    fi
+
+    if (( install_profile == 1 )); then
+        _profile_install_in_file "$HOME/.profile" "$source_line" || rc=$?
+    fi
+
+    return "$rc"
+}
+
+if [[ $# -gt 0 ]]; then
+    case "$1" in
+        --install)
+            shift
+            _profile_install "$@"
+            _profile_finish $?
+            ;;
+        -h|--help)
+            printf "Usage: source %s\n" "${BASH_SOURCE[0]}"
+            printf "       %s --install [--bashrc] [--profile]\n" "${BASH_SOURCE[0]}"
+            _profile_finish 0
+            ;;
+        *)
+            printf "[ Error ] Unknown option: %s\n" "$1" >&2
+            _profile_finish 2
+            ;;
+    esac
+fi
+
+if ! _profile_is_sourced; then
+    printf "[ Warning ] profile.sh is designed to be sourced, not executed directly.\n" >&2
+    printf "Use: source \"%s\"\n" "$(realpath -s "${BASH_SOURCE[0]}")" >&2
+    printf "Or run: %s --install [--bashrc] [--profile]\n" "${BASH_SOURCE[0]}" >&2
+    exit 1
+fi
+
 if [[ ! $SHELL =~ bash ]]; then
     echo "That environment script is designed to be used with bash being the shell."
     echo "Please consider using bash to enjoy our features!"
-    return 1
+    _profile_finish 1
 fi
 
 # Required for associative arrays (4.0+) and namerefs (4.3+)
@@ -48,6 +161,8 @@ if ((BASH_VERSINFO[0] < 4)) || [[ ${BASH_VERSINFO[0]} -eq 4 && ${BASH_VERSINFO[1
     (return 0 2>/dev/null) && return 1 || exit 1
 fi
 
+unset -f _profile_is_sourced _profile_finish _profile_install_in_file _profile_install
+
 # ------------------------------------------------------------------------------
 # path* : private functions for PATH variable management
 pathremove()
@@ -236,6 +351,10 @@ fi
 # Parse and load general configuration
 export PROFILE_CONF="$MYPATH/profile.conf"
 parse_conf "$PROFILE_CONF"
+# Overload with user configuration if it exists
+if [[ -f "$HOME/.profile.conf" ]]; then
+    parse_conf "$HOME/.profile.conf"
+fi
 load_conf system  # Load Bash system behavior configuration (history, pager, etc.)
 load_conf general # General purpose configuration (compilation flags, etc.)