Complete overhaul: modular layout, HTTP/1.1 keep-alive engine, TLS, bats test suite, CI

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y socat ncat bats curl openssl
+
+      - name: Build single-file artifact
+        # Exercise the Makefile + inliner so the single-file build can't bitrot.
+        # (The single_file.bats test under tests/integration also rebuilds it.)
+        run: make build
+
+      - name: Smoke-test the single-file artifact
+        run: dist/bashttpd version
+
+      - name: Run test suite
+        run: |
+          if [[ -x ./tests/run ]]; then
+            ./tests/run
+          else
+            bats --recursive tests/
+          fi
+
+  lint:
+    name: Lint (shellcheck)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install shellcheck
+        run: sudo apt-get update && sudo apt-get install -y shellcheck
+
+      - name: Run shellcheck
+        run: shellcheck bashttpd bin/bashttpd lib/bashttpd/*.sh scripts/*.sh
+
+      - name: Build and shellcheck the single-file artifact
+        # The generated dist/bashttpd must stay lint-clean too.
+        run: |
+          make build
+          shellcheck dist/bashttpd

.github/workflows/release.yml

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+name: Release
+
+# On any pushed v* tag: build the self-contained single file and publish it as
+# a release asset named `bashttpd`, so that
+#   curl -LO https://github.com/avleen/bashttpd/releases/latest/download/bashttpd
+# fetches a ready-to-run server.
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    name: Build and publish single-file release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0   # so `git describe --tags` can stamp the build
+
+      - name: Build single-file artifact
+        run: make build
+
+      - name: Smoke-test the artifact
+        run: |
+          test -x dist/bashttpd
+          dist/bashttpd version
+
+      - name: Create GitHub release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: dist/bashttpd
+          fail_on_unmatched_files: true
+          generate_release_notes: true

.gitignore

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+# Build artifacts. The single-file build is produced on demand / in CI and
+# attached to releases; it is never committed.
+/dist/

Makefile

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+# bashttpd -- developer Makefile (GNU make).
+#
+#   make build   build the self-contained single file into dist/bashttpd
+#   make test    run the bats test suite (./tests/run)
+#   make lint    run shellcheck over every shell source
+#   make check   lint + test
+#   make clean   remove dist/
+
+SHELL := /bin/bash
+
+LIB_SOURCES := $(wildcard lib/bashttpd/*.sh)
+DIST        := dist/bashttpd
+
+SHELL_SOURCES := bashttpd bin/bashttpd $(LIB_SOURCES) $(wildcard scripts/*.sh)
+
+.PHONY: build test lint check clean
+
+build: $(DIST)
+
+$(DIST): bin/bashttpd $(LIB_SOURCES) scripts/build-single.sh
+	./scripts/build-single.sh
+
+test:
+	./tests/run
+
+lint:
+	shellcheck $(SHELL_SOURCES)
+
+check: lint test
+
+clean:
+	rm -rf dist