refactor: entry point picks its mode once; NO_COLOR

CHANGELOG.md

@@ -9,6 +9,7 @@ one per merged pull request.
 
 - **refactor: Valve's package mirror in one module (`lib/valve-mirror.sh`: newest repo, package database fields, checksummed download); the SteamOS extras, CEC driver, BIOS lookup and os-release version used four copies**
 - **refactor: the rules between menu items are three tables (`REQUIRES`, `FOLLOWS`, `EXCLUDES` in `lib/menu.sh`) used by the menu's toggles and, as `normalize_wanted`, by the app's selection (it had its own copy of the rules). The app now also ticks the Steamify shortcut for "Add as non-Steam game" and unticks the game entry with it, like the menu**
+- **refactor: the entry point picks its mode once (`MODE`) and `--defaults` and `--boot` are functions with one failure report, instead of four booleans and two copies of the apply-and-report code; `NO_COLOR` gives plain output**
 - **test: the menu rules, the plan and the app's and installer's JSON are checked against a golden file (`tests/menu-test.sh` in steamify-cachyos-dev); `make check`, `.editorconfig`, `.shellcheckrc`**
 - **docs: README lists the sources and projects Steamify builds on, with licences and thanks**
 

lib/common.sh

@@ -2,7 +2,12 @@
 # Output helpers, prompts and small shared utilities.
 # Sourced by steamify.sh; not meant to be run on its own.
 
-c_reset="\033[0m"; c_bold="\033[1m"; c_green="\033[32m"; c_yellow="\033[33m"; c_red="\033[31m"; c_cyan="\033[36m"; c_dim="\033[2m"
+# NO_COLOR (https://no-color.org): plain output, e.g. for a log file.
+if [[ -n "${NO_COLOR:-}" ]]; then
+    c_reset=""; c_bold=""; c_green=""; c_yellow=""; c_red=""; c_cyan=""; c_dim=""
+else
+    c_reset="\033[0m"; c_bold="\033[1m"; c_green="\033[32m"; c_yellow="\033[33m"; c_red="\033[31m"; c_cyan="\033[36m"; c_dim="\033[2m"
+fi
 
 info()  { echo -e "${c_cyan}[INFO]${c_reset} $*"; }
 ok()    { echo -e "${c_green}[OK]${c_reset} $*"; }

steamify.sh

@@ -26,23 +26,28 @@ done
 
 require_root_helper
 
-BACKEND=false
-[[ "${1:-}" == --backend ]] && BACKEND=true
-# --defaults [--options <id>,...] [--boot gamescope|desktop]: apply what the
-# menu would preselect (or exactly the listed items), without the menu or any
-# prompt (the Steam Machine ISO's first login runs this; sudo must not ask).
-DEFAULTS=false
-[[ "${1:-}" == --defaults ]] && DEFAULTS=true
-# --defaults --list: what --defaults can set up here, as JSON (an installer
-# page is built from it); nothing else on stdout.
-LIST=false
-[[ "$DEFAULTS" == true && "${2:-}" == --list ]] && LIST=true
-# --boot gamescope|desktop: only change where an installed conversion
-# starts, everything else stays as it is (for scripts; no menu).
-BOOT_ONLY=false
-[[ "${1:-}" == --boot ]] && BOOT_ONLY=true
+# What this run does, from the first argument:
+#   --backend ...                       the graphical app's machine-readable mode
+#   --defaults [--options <id>,...] [--boot gamescope|desktop]: apply what the
+#       menu would preselect (or exactly the listed items), without the menu or
+#       any prompt (the Steam Machine ISO's first login runs this; sudo must not
+#       ask)
+#   --defaults --list                   what --defaults can set up here, as JSON
+#       (an installer page is built from it); nothing else on stdout
+#   --boot gamescope|desktop            only change where an installed conversion
+#       starts, everything else stays as it is (for scripts; no menu)
+#   --first-login                       the installer's one-time follow-up
+#   (none)                              the menu
+MODE=menu
+case "${1:-}" in
+    --backend) MODE=backend ;;
+    --defaults) MODE=defaults; [[ "${2:-}" == --list ]] && MODE=list ;;
+    --boot) MODE=boot ;;
+    --first-login) MODE=first-login ;;
+esac
+BACKEND=false; [[ "$MODE" == backend ]] && BACKEND=true
 
-if [[ "$BACKEND" == false && "$LIST" == false ]]; then
+if [[ "$MODE" != backend && "$MODE" != list ]]; then
     echo -e "${c_bold}Steamify CachyOS${c_reset} v$VERSION"
     echo "Turn the SteamOS-style parts on or off. The menu shows what is on now;"
     echo "anything you turn off is put back the way it was."
@@ -118,63 +123,62 @@ quit_prompt() {
     return 0
 }
 
-# The graphical app (steamify-ui) drives the same components through
-# lib/backend.sh instead of the menu.
-if [[ "$BACKEND" == true ]]; then
-    RESTART_FOR_LOGIN=false
-    shift
-    backend_main "$@"
-    exit $?
-fi
+report_failed() {
+    # Exit status for the scripted modes: 1 when a component had problems.
+    [[ ${#FAILED[@]} -eq 0 ]] || { warn "These had problems (see above): ${FAILED[*]}"; return 1; }
+}
 
-if [[ "${1:-}" == --first-login ]]; then
-    first_login_run
-    exit 0
-fi
-
-if [[ "$LIST" == true ]]; then
-    defaults_list
-    exit 0
-fi
-
-if [[ "$DEFAULTS" == true ]]; then
+run_defaults() {
     RESTART_FOR_LOGIN=false
     REAPPLY=false
-    sudo -n true 2>/dev/null || { err "--defaults needs sudo without a password."; exit 1; }
+    sudo -n true 2>/dev/null || { err "--defaults needs sudo without a password."; return 1; }
     detect_components
-    defaults_options "${@:2}" || exit 1
+    defaults_options "${@:2}" || return 1
     plan_changes
     apply_changes
     # Run by the installer: the rest waits for the first desktop login.
     user_session || first_login_schedule
-    [[ ${#FAILED[@]} -eq 0 ]] || { warn "These had problems (see above): ${FAILED[*]}"; exit 1; }
+    report_failed || return 1
     ok "Done; the changes take effect after a restart."
-    exit 0
-fi
+}
 
-if [[ "$BOOT_ONLY" == true ]]; then
+run_boot_only() {
+    local mode="${2:-}" c
     RESTART_FOR_LOGIN=false
     REAPPLY=false
-    case "${2:-}" in
+    case "$mode" in
         gamescope|desktop) ;;
-        *) err "--boot takes gamescope or desktop"; exit 1 ;;
+        *) err "--boot takes gamescope or desktop"; return 1 ;;
     esac
     detect_components
-    [[ "${CURRENT[gaming]}" == 1 ]] || { err "--boot needs the SteamOS conversion; turn it on first."; exit 1; }
+    [[ "${CURRENT[gaming]}" == 1 ]] || { err "--boot needs the SteamOS conversion; turn it on first."; return 1; }
     # What is on stays on, and nothing else changes: not the updates or
     # removals a normal run would pick.
     for c in "${COMPONENTS[@]}"; do WANTED[$c]=${CURRENT[$c]:-0}; done
-    WANTED[boot]=0; [[ "$2" == desktop ]] && WANTED[boot]=1
+    WANTED[boot]=0; [[ "$mode" == desktop ]] && WANTED[boot]=1
     plan_changes
     if [[ ${#TO_DISABLE[@]} -eq 0 && ${#TO_ENABLE[@]} -eq 0 ]]; then
-        ok "Already starting in $2."
-        exit 0
+        ok "Already starting in $mode."
+        return 0
     fi
     apply_changes
-    [[ ${#FAILED[@]} -eq 0 ]] || { warn "These had problems (see above): ${FAILED[*]}"; exit 1; }
-    ok "Starts in $2 from the next boot on."
-    exit 0
-fi
+    report_failed || return 1
+    ok "Starts in $mode from the next boot on."
+}
+
+case "$MODE" in
+    backend)
+        # The graphical app (steamify-ui) drives the same components through
+        # lib/backend.sh instead of the menu.
+        RESTART_FOR_LOGIN=false
+        shift
+        backend_main "$@"
+        exit $? ;;
+    first-login) first_login_run; exit 0 ;;
+    list) defaults_list; exit 0 ;;
+    defaults) run_defaults "$@"; exit $? ;;
+    boot) run_boot_only "$@"; exit $? ;;
+esac
 
 # Menu loop: after each run the menu comes back with the new state, until
 # the user quits; the restart question comes then, once, for everything.