split script in multiple files, reassembled through build.sh

build.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+# vim: set ts=4 sw=4 sts=4 et:
+# Assemble spectre-meltdown-checker.sh from src/ fragments.
+# Usage: ./build.sh [output_file]
+#   default output: spectre-meltdown-checker.sh
+set -e
+
+SRCDIR="$(dirname "$0")/src"
+OUTPUT="${1:-$(dirname "$0")/spectre-meltdown-checker.sh}"
+
+SECTIONS="
+libs/*.sh
+vulns-helpers/*.sh
+vulns/*.sh
+main.sh
+db/*.sh
+"
+
+first=1
+for pattern in $SECTIONS; do
+    # shellcheck disable=SC2086
+    for file in "$SRCDIR"/$pattern; do
+        [ -f "$file" ] || continue
+        # source file marker
+        relpath="${file#"$SRCDIR"/}"
+        if [ "$first" = 1 ]; then
+            # first file (001_core_header.sh): emit verbatim, keeps shebang
+            cat "$file"
+            first=0
+        else
+            # separator blank line + source marker between fragments
+            echo ""
+            echo "# >>>>>> $relpath <<<<<<"
+            echo ""
+            # strip accidental shebang on line 1
+            {
+                IFS= read -r line
+                case "$line" in
+                    '#!'*) ;; # skip shebang
+                    *) printf '%s\n' "$line" ;;
+                esac
+                cat
+            } <"$file"
+        fi
+    done
+done >"$OUTPUT"
+
+chmod +x "$OUTPUT"
+echo "Assembled $OUTPUT ($(wc -l <"$OUTPUT") lines)"