[Feature] Allow selecting which version to install for windows installer

docs/advanced/windows_installer.md

@@ -20,6 +20,9 @@ The pipeline, end to end:
    - Checks the Windows build (≥ 19041) and whether WSL is installed; if not,
      runs `wsl --install --no-launch` and asks the user to reboot once.
    - Optionally enables TUNA (Tsinghua) mirrors for users in Mainland China.
+   - Prompts for an ABACUS version (blank = latest on conda-forge; an exact
+     version like `3.7.4` is pinned; a match-spec like `>=3.7,<3.8` is passed
+     through to conda).
    - Detects the target distribution (`Ubuntu-22.04`) by querying the WSL
      registry key `HKCU\Software\Microsoft\Windows\CurrentVersion\Lxss`. This
      is immune to UTF-16 parsing pitfalls and to Store appx leftovers that
@@ -88,6 +91,8 @@ The pipeline, end to end:
 1. Clone or download this repository.
 2. In `tools/windows/`, right-click `install-abacus.bat` → **Run as administrator**.
 3. Answer the China-mirror prompt (`y` recommended inside Mainland China).
+   Then pick an ABACUS version when prompted (leave blank for the latest on
+   conda-forge; for a pinned install, type an exact version such as `3.7.4`).
 4. If this is the first time WSL is installed on the machine, the script
    will ask you to reboot and run it again.
 5. Wait for `[*] Provisioning ABACUS …` to finish (5–15 minutes on first

tools/windows/README.md

@@ -17,6 +17,9 @@ The pipeline, end to end:
    - Checks the Windows build (≥ 19041) and whether WSL is installed; if not,
      runs `wsl --install --no-launch` and asks the user to reboot once.
    - Optionally enables TUNA (Tsinghua) mirrors for users in Mainland China.
+   - Prompts for an ABACUS version (blank = latest on conda-forge; an exact
+     version like `3.7.4` is pinned; a match-spec like `>=3.7,<3.8` is passed
+     through to conda).
    - Detects the target distribution (`Ubuntu-22.04`) by querying the WSL
      registry key `HKCU\Software\Microsoft\Windows\CurrentVersion\Lxss`. This
      is immune to UTF-16 parsing pitfalls and to Store appx leftovers that
@@ -85,6 +88,8 @@ The pipeline, end to end:
 1. Clone or download this repository.
 2. Right-click `install-abacus.bat` → **Run as administrator**.
 3. Answer the China-mirror prompt (`y` recommended inside Mainland China).
+   Then pick an ABACUS version when prompted (leave blank for the latest on
+   conda-forge; for a pinned install, type an exact version such as `3.7.4`).
 4. If this is the first time WSL is installed on the machine, the script
    will ask you to reboot and run it again.
 5. Wait for `[*] Provisioning ABACUS …` to finish (5–15 minutes on first

tools/windows/install-abacus.bat

@@ -35,6 +35,16 @@ if not defined ABACUS_CHINA_MIRROR (
     if /i "!CHINA_INPUT!"=="y" set "ABACUS_CHINA_MIRROR=1"
 )
 
+REM --- 2c. Optional ABACUS version pin (blank = latest from conda-forge) ---
+if not defined ABACUS_VERSION (
+    echo.
+    echo Which ABACUS version would you like to install?
+    echo   - Leave blank to install the latest available on conda-forge.
+    echo   - Or enter an exact version, e.g. 3.7.4
+    echo   - You can also enter a conda match-spec, e.g. "^>=3.7,^<3.8"
+    set /p ABACUS_VERSION="ABACUS version [latest]: "
+)
+
 REM --- 3. Ensure WSL itself is present ---
 where wsl >nul 2>&1
 if errorlevel 1 (
@@ -108,7 +118,7 @@ if not defined WSL_SCRIPT (
 REM Strip any CR bytes that a Windows editor / git autocrlf may have injected
 REM into provision.sh, then pipe the cleaned script into bash. Without this,
 REM bash reads `set -euo pipefail\r` and errors on the literal \r.
-wsl -d %DISTRO% -u root -- bash -c "sed 's/\r$//' '!WSL_SCRIPT!' | ABACUS_CHINA_MIRROR=!ABACUS_CHINA_MIRROR! bash"
+wsl -d %DISTRO% -u root -- bash -c "sed 's/\r$//' '!WSL_SCRIPT!' | ABACUS_CHINA_MIRROR=!ABACUS_CHINA_MIRROR! ABACUS_VERSION='!ABACUS_VERSION!' bash"
 if errorlevel 1 (
     echo [!] Provisioning failed. See output above.
     pause & exit /b 1

tools/windows/provision.sh

@@ -8,6 +8,18 @@ MINIFORGE_DIR="/opt/abacus-miniforge"
 ENV_NAME="abacus_env"
 ENV_BIN="$MINIFORGE_DIR/envs/$ENV_NAME/bin"
 CHINA_MIRROR="${ABACUS_CHINA_MIRROR:-0}"
+VERSION_SPEC="${ABACUS_VERSION:-}"
+
+# Build the conda match-spec. Empty => latest; a bare version like "3.7.4"
+# is pinned with "="; anything containing an operator (>=, <, etc.) or a
+# comma is passed through as-is.
+if [ -z "$VERSION_SPEC" ]; then
+    ABACUS_PKG="abacus"
+elif echo "$VERSION_SPEC" | grep -qE '[<>=!,* ]'; then
+    ABACUS_PKG="abacus $VERSION_SPEC"
+else
+    ABACUS_PKG="abacus=$VERSION_SPEC"
+fi
 
 if [ "$CHINA_MIRROR" = "1" ]; then
     MINIFORGE_URL="https://mirrors.tuna.tsinghua.edu.cn/github-release/conda-forge/miniforge/LatestRelease/Miniforge3-Linux-x86_64.sh"
@@ -62,11 +74,13 @@ fi
 source "$MINIFORGE_DIR/etc/profile.d/conda.sh"
 
 if conda env list | awk 'NF && $1 !~ /^#/ {print $1}' | grep -qx "$ENV_NAME"; then
-    log "Updating existing env '$ENV_NAME' (channel: $CONDA_FORGE_CHANNEL)..."
-    conda install -n "$ENV_NAME" -y --override-channels -c "$CONDA_FORGE_CHANNEL" abacus
+    log "Updating existing env '$ENV_NAME' (channel: $CONDA_FORGE_CHANNEL, package: $ABACUS_PKG)..."
+    # shellcheck disable=SC2086
+    conda install -n "$ENV_NAME" -y --override-channels -c "$CONDA_FORGE_CHANNEL" $ABACUS_PKG
 else
-    log "Creating env '$ENV_NAME' (channel: $CONDA_FORGE_CHANNEL)..."
-    conda create -n "$ENV_NAME" -y --override-channels -c "$CONDA_FORGE_CHANNEL" abacus
+    log "Creating env '$ENV_NAME' (channel: $CONDA_FORGE_CHANNEL, package: $ABACUS_PKG)..."
+    # shellcheck disable=SC2086
+    conda create -n "$ENV_NAME" -y --override-channels -c "$CONDA_FORGE_CHANNEL" $ABACUS_PKG
 fi
 
 log "Installing system launchers..."