Meta: Add script to generate and export manpages

Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/a4e805756d4
Pull-request: https://github.com/SerenityOS/serenity/pull/10655
Reviewed-by: https://github.com/linusg

Meta/export-argsparser-manpages.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+set -e
+
+script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+cd "${script_path}/.."
+
+if ! command -v tar >/dev/null 2>&1 ; then
+    echo "Please install tar!"
+    exit 1
+fi
+
+echo "This script assumes passwordless sudo."
+sudo true
+
+if [ -z "$BUILD_DIR" ]; then
+    if [ -z "$SERENITY_ARCH" ]; then
+        export SERENITY_ARCH="i686"
+        echo "SERENITY_ARCH not given. Assuming ${SERENITY_ARCH}."
+    fi
+    BUILD_DIR=Build/"$SERENITY_ARCH"
+    echo "BUILD_DIR not given. Assuming ${BUILD_DIR}."
+fi
+
+if [ -e fsmount ]; then
+    echo "Directory 'fsmount' already exists."
+    echo "Manual cleanup needed. You might also need to unmount first."
+    exit 1
+fi
+
+if ! [ -d Base/usr/share/man/ ]; then
+    echo "Base/usr/share/man/ does not exist. How did that happen?! o.O"
+    exit 1
+fi
+
+echo "Using 'ninja run' to generate manpages ..."
+export SERENITY_RUN="ci"
+export SERENITY_KERNEL_CMDLINE="fbdev=off panic=shutdown system_mode=generate-manpages"
+# The 'sed' gets rid of the clear-screen escape sequence.
+ninja -C "$BUILD_DIR" -- run | sed -re 's,''c,,'
+echo
+
+echo "Extracting generated manpages ..."
+mkdir fsmount
+sudo mount -t ext2 -o loop,rw "$BUILD_DIR"/_disk_image fsmount
+# 'cp' would create the new files as root, but we don't want that.
+sudo tar -C fsmount/root/generated_manpages --create . | tar -C Base/usr/share/man/ --extract
+sudo umount fsmount
+rmdir fsmount
+
+echo "Successfully (re-)generated manpages in Base/usr/share/man/"