update doc

README.md

@@ -42,7 +42,22 @@ source /opt/profile/profile.sh
 It's not recommended to load that profile in `/etc/profile` as users' `.bashrc`
 files might interfere with some aliases and functions defined in profile.
 
-### 2.1. Initial configuration
+### 2.1. Interactive vs non-interactive shells
+
+`profile.sh` detects whether the current shell is interactive.
+
+In interactive shells (typical terminal sessions), profile enables
+interactive-only features such as:
+- aliases from `[aliases]`
+- bash completion scripts from `profile.d/bash-completion/`
+- prompt initialization (`PROMPT_COMMAND` and timer hook)
+- welcome display (`showinfo`) and startup update check (`check_updates -q`)
+
+In non-interactive shells (typical script execution), those features are
+intentionally skipped to avoid side effects and startup noise. Public functions
+remain available after sourcing, so scripts can still call profile helpers.
+
+### 2.2. Initial configuration
 Copy the example configuration file and customise it to your needs:
 ```bash
 cp <installpath>/profile/doc/profile.conf.example <installpath>/profile/profile.conf
@@ -132,7 +147,7 @@ apply when unset.
 
 `profile.conf` is listed in `.gitignore` so personal values (API keys, cities,
 compiler flags, …) are never accidentally staged. Start from the annotated
-template at `doc/profile.conf.example` (see [section 2.1](#21-initial-configuration)).
+template at `doc/profile.conf.example` (see [section 2.2](#22-initial-configuration)).
 
 ### 4.1. Core sections
 
@@ -152,7 +167,7 @@ change the default without having to pass flags every time.
 | Key | Default | Description |
 |---|---|---|
 | `TAZ_DEFAULT_FORMAT` | `tar.gz` | Archive format for `taz` (`tar.gz`, `tar.bz2`, `tar.xz`, `zip`, …) |
-| `TAZ_DEFAULT_THREADS` | `0` | Compression threads (0 = auto-detect) |
+| `TAZ_DEFAULT_THREADS` | `auto` | Compression threads (`auto` = runtime CPU count, or explicit positive integer) |
 | `TAZ_DEFAULT_LEVEL` | `6` | Compression level (1–9) |
 | `UTAZ_DEFAULT_DELETE` | `0` | Set to `1` to delete the source archive after extraction |
 | `UTAZ_DEFAULT_DIR_MODE` | `0` | Set to `1` to always extract into a subdirectory |

doc/CHANGELOG.md

@@ -23,6 +23,11 @@ Versions follow `MAJOR.MINOR.PATCH-REVISION_STAGE_N` (e.g. `3.99.1-4_rc_1`).
 - `disp` now wraps long messages on terminal width, avoids mid-word splits, and
   aligns continuation lines with the message body after the prefix.
 - `help` now supports `help <command>` and delegates to `<command> --help`.
+- `taz` now supports `-p auto` / `--parallel=auto` to automatically use the
+  runtime CPU count. This mode is now the default via
+  `TAZ_DEFAULT_THREADS=auto`.
+- `taz` keeps backward compatibility with legacy `TAZ_DEFAULT_THREADS=0`
+  values by interpreting `0` as `auto`.
 
 ### Fixed
 - Startup responsiveness improved: `check_updates -q` now uses a short network

doc/FAQ.md

@@ -52,6 +52,33 @@ scripts start with `#!/usr/bin/env bash`.
 
 ---
 
+**Q: Can I use profile functions in scripts?**
+
+Yes. The supported way is to source `profile.sh` from a Bash script:
+```bash
+#!/usr/bin/env bash
+source /path/to/profile/profile.sh
+
+taz -p auto -f lz mydir
+```
+You can also source one module directly (for example
+`profile.d/compress.sh`) if you only need a subset of functions.
+
+When you source a module directly, profile configuration parsing/loading from
+`profile.sh` is skipped, so defaults from `profile.conf` are not applied unless
+your script loads them explicitly.
+
+`profile.sh` also detects whether the current shell is interactive. In
+non-interactive shells (typical script execution), interactive-only features
+are intentionally disabled: prompt setup, aliases, welcome/info messages, and
+startup update checks are not enabled.
+
+In all cases, avoid aliases in scripts. Use real commands/functions instead,
+because alias expansion is interactive-shell oriented and can be disabled or
+behave differently in non-interactive execution.
+
+---
+
 **Q: I set `PROFILE_PATH` but profile still can't find its modules.**
 
 `PROFILE_PATH` must be exported *before* you source `profile.sh`:

doc/profile.conf.example

@@ -30,8 +30,10 @@ TERM=xterm-256color
 # Supported: lz (default), xz, bz2, gz, lzo, tar, zip, zst
 #TAZ_DEFAULT_FORMAT=lz
 
-# taz: Number of compression threads (0 = auto-detect CPU count).
-#TAZ_DEFAULT_THREADS=0
+# taz: Number of compression threads.
+#   auto — detect CPU count at runtime (default)
+#   N    — explicit positive integer
+#TAZ_DEFAULT_THREADS=auto
 
 # taz: Compression level 1 (fast/large) … 9 (slow/small).
 #TAZ_DEFAULT_LEVEL=6

profile.d/compress.sh

@@ -395,18 +395,32 @@ export -f utaz
 
 # ------------------------------------------------------------------------------
 # Compress directories or files into one or more archive
-# Usage: taz [option] [--parallel=<n>] [--format=<format>] [directory1 ... directoryN]
+# Usage: taz [option] [--parallel=<n|auto>] [--format=<format>] [directory1 ... directoryN]
 # Options:
 # 	-h, --help	Display that help screen
 # 	-d, --delete	Delete source file or directory after success
 # 	-f, --format	Chose archive format in the given list. If several format are
 # 			given, the smalest is kept
-# 	-p, --parallel	Number of threads to use (if allowed by underlying utility)
+# 	-p, --parallel	Number of threads to use, or 'auto' to use detected CPU count
 # 	-v, --verbose	Display progress where possible
 # 	-q, --quiet	Display less messages (only errors and warnings)
 # 	-1, .., -9	Compression level to use [1=fast/biggest, 9=slow/smallest]
 taz()
 {
+    # Resolve runtime CPU count for --parallel=auto.
+    _taz_detect_cpus()
+    {
+        local cpus=1
+        if command -v nproc >/dev/null 2>&1; then
+            cpus=$(nproc 2>/dev/null)
+        elif command -v getconf >/dev/null 2>&1; then
+            cpus=$(getconf _NPROCESSORS_ONLN 2>/dev/null)
+        fi
+
+        [[ $cpus =~ ^[1-9][0-9]*$ ]] || cpus=1
+        printf "%s\n" "$cpus"
+    }
+
     # shellcheck disable=SC2329
     _doxz()
     {
@@ -537,13 +551,13 @@ taz()
         case "$1" in
         -h|--help)
             printf "taz: archive all files of a directory.\n\n"
-            printf "Usage: taz [option] [--parallel=<n>] [--format=<format>] [directory1 ... directoryN]\n\n"
+            printf "Usage: taz [option] [--parallel=<n|auto>] [--format=<format>] [directory1 ... directoryN]\n\n"
             printf "Options:\n"
             printf "\t-h, --help\tDisplay that help screen\n"
             printf "\t-d, --delete\tDelete source file or directory after success\n"
             printf "\t-f, --format\tChose archive format in the given list. If several format are"
             printf "\t\t\tgiven, the smalest is kept\n"
-            printf "\t-p, --parallel\tNumber of threads to use (if allowed by underlying utility)\n"
+            printf "\t-p, --parallel\tNumber of threads, or 'auto' for runtime CPU count\n"
             printf "\t-v, --verbose\tDisplay progress where possible\n"
             printf "\t-q, --quiet\tDisplay less messages (only errors and warnings)\n"
             printf "\t-1, .., -9\tCompression level to use [1=fast/biggest, 9=slow/smallest]\n\n"
@@ -606,11 +620,20 @@ taz()
         [[ ${#FILES[@]} -eq 0 ]] && FILES=(".")
 
     [[ ! $compform ]]   && compform=${TAZ_DEFAULT_FORMAT:-lz}
-    [[ ! $nproc ]]      && nproc=${TAZ_DEFAULT_THREADS:-1}
+    [[ ! $nproc ]]      && nproc=${TAZ_DEFAULT_THREADS:-auto}
     [[ ! $complevel ]]  && complevel=${TAZ_DEFAULT_LEVEL:-6}
     [[ $verbose -gt 1 && $quiet -gt 1 ]] &&
         disp E "The --verbose and --quiet options can't be used together."
 
+    # Backward compatibility: 0 previously meant auto-detect.
+    [[ $nproc == 0 ]] && nproc=auto
+    if [[ $nproc == auto ]]; then
+        nproc=$(_taz_detect_cpus)
+    elif [[ ! $nproc =~ ^[1-9][0-9]*$ ]]; then
+        disp E "Invalid value for --parallel: '$nproc' (expected auto or a positive integer)."
+        return 1
+    fi
+
     for item in "${FILES[@]}"; do
         local donetar=0
         disp I "Processing $item..."

profile.sh

@@ -161,8 +161,6 @@ 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()
@@ -408,7 +406,9 @@ if [[ $INTERACTIVE ]]; then
 fi
 
 # Cleanup
-unset pathremove pathprepend pathappend
+unset -f _profile_is_sourced _profile_finish _profile_install_in_file _profile_install
+unset -f parse_conf load_alias load_conf
+unset -f pathremove pathprepend pathappend
 
 #return 0