Ran the installed ocdsgen, and added a script that installs the dev tools

go generate ran ocdsgen with go run, from go.mod, but go-ocds had been
dropped from go.mod (nothing imports it, so go mod tidy removes it), which
broke go generate and so scripts/build.sh. It now runs the installed
ocdsgen from PATH, as it does swag.

scripts/install-dev-tools.sh installs the Go tools (ocdsgen v1.0.0 and swag
v2.0.0-rc6 pinned, as other versions could generate different code;
golangci-lint, goose and cobra-cli at their latest), checks for Node.js 24
or later and runs npm ci in web/. The README's dev tools section now points
to it and lists what each tool is for.

README.md

@@ -18,7 +18,8 @@ scripts/build.sh --release          # also package release/job-search-<version>-
 The build script builds the frontend and copies it into place for embedding
 (`npm run build` and `npm run sync` in `web/`, which need Node and npm; it
 runs `npm ci` first for a release, or when `web/node_modules` is missing). It
-then runs `go generate ./...`, which needs `swag` installed (see
+then runs `go generate ./...`, which needs `ocdsgen` and `swag` installed
+(`scripts/install-dev-tools.sh`; see
 [Installation of dev tools](#installation-of-dev-tools)), and stamps the
 version from the latest git tag. A build from untagged commits is marked as a development build
 and isn't packaged unless `--force` is also given.
@@ -246,24 +247,27 @@ Using a source called `example` as an illustration:
 
 
 ## Installation of dev tools
-A number of tools have been used in the development of the project. Installation
-of these tools can be done using `go install`.
+`scripts/install-dev-tools.sh` installs everything needed to develop and
+build the project: the Go tools below, with `go install`, and the frontend's
+npm packages (`npm ci` in `web/`). It needs Go and Node.js 24 or later (with
+npm), as the frontend's scripts run TypeScript directly. Run it again after
+a tool's version in it changes.
 
-To install the tools:
 ```bash
-go install github.com/spf13/cobra-cli@latest
-go install git.avsdev.uk/Go/go-ocds/cmd/ocdsgen@latest
-go install github.com/pressly/goose/v3/cmd/goose@latest
-go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest
-go install github.com/swaggo/swag/v2/cmd/swag@v2.0.0-rc6
+scripts/install-dev-tools.sh
 ```
 
-`goose` creates new migration files (see `internal/store`); the migrations
-themselves are applied by `job-search migrate`. `golangci-lint` uses the
-project's `.golangci.json`. `swag` generates the API's OpenAPI 3.1 spec from
-the handlers' comments (`swag init --v3.1`). Its v2, the version with OpenAPI
-3 support, has only had release candidates so far, so it is pinned to one
-rather than `@latest`.
+| Tool | Version | Used for |
+|---|---|---|
+| `ocdsgen` (`git.avsdev.uk/Go/go-ocds`) | v1.0.0 | Generates the OCDS types in `internal/findatender/ocds` (`ocds_gen.go`) from `extensions.json`, run by `go generate` |
+| `swag` | v2.0.0-rc6 | Generates the API's OpenAPI 3.1 description from the handlers' comments (`swag init --v3.1`), run by `go generate` |
+| `golangci-lint` | latest | Lints the Go code with the project's `.golangci.json` |
+| `goose` | latest | Creates new migration files (see `internal/store`); the migrations themselves are applied by `job-search migrate` |
+| `cobra-cli` | latest | Adds cobra commands |
 
-Ensure that the GOBIN path ($HOME/go/bin) is added to the environment before
-running any of the tools.
+The generators are pinned, as another version could generate different code.
+`swag`'s v2, the version with OpenAPI 3 support, has only had release
+candidates so far. `go generate ./...` and the build script run the
+generators from PATH, so ensure that the GOBIN path (`$HOME/go/bin` by
+default) is added to the environment before running any of the tools; the
+script says if it isn't.

internal/findatender/ocds/generate.go

@@ -2,4 +2,4 @@
 // the EU profile, UK extension, and the other extensions in extensions.json.
 package ocds
 
-//go:generate go run git.avsdev.uk/Go/go-ocds/cmd/ocdsgen generate -c extensions.json -o ocds_gen.go -p ocds
+//go:generate ocdsgen generate -c extensions.json -o ocds_gen.go -p ocds

scripts/install-dev-tools.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+# Installs the tools needed to develop and build job-search: the Go tools
+# (with go install, into $(go env GOBIN), or $(go env GOPATH)/bin), and the
+# frontend's npm packages (with npm ci in web/). Run it from anywhere; run it
+# again after a version below changes.
+
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+# The Go tools. A generator is pinned, as a different version could generate
+# different code; the others follow their latest release.
+GO_TOOLS=(
+    # Generates the OCDS types (internal/findatender/ocds) from extensions.json
+    "git.avsdev.uk/Go/go-ocds/cmd/ocdsgen@v1.0.0"
+    # Generates the API's OpenAPI 3.1 description; v2 is only a release
+    # candidate so far
+    "github.com/swaggo/swag/v2/cmd/swag@v2.0.0-rc6"
+    # Lints the Go code with .golangci.json
+    "github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest"
+    # Creates migration files (internal/store/migrations)
+    "github.com/pressly/goose/v3/cmd/goose@latest"
+    # Adds cobra commands
+    "github.com/spf13/cobra-cli@latest"
+)
+
+# The oldest Node.js the frontend's scripts run on: they run TypeScript
+# directly.
+NODE_MAJOR=24
+
+for tool in "${GO_TOOLS[@]}"; do
+    echo "go install $tool"
+    go install "$tool"
+done
+
+if ! command -v node >/dev/null || ! command -v npm >/dev/null; then
+    echo "Node.js $NODE_MAJOR or later (with npm) is needed for web/: install it, then run this again" >&2
+    exit 1
+fi
+node_version=$(node --version)
+node_major=${node_version#v}
+node_major=${node_major%%.*}
+if (( node_major < NODE_MAJOR )); then
+    echo "Node.js $NODE_MAJOR or later is needed for web/, found $node_version" >&2
+    exit 1
+fi
+
+echo "npm ci (web/)"
+(cd web && npm ci)
+
+# go generate and the build script find the Go tools on PATH.
+bin_dir=$(go env GOBIN)
+if [[ -z $bin_dir ]]; then
+    bin_dir=$(go env GOPATH)/bin
+fi
+if [[ ":$PATH:" != *":$bin_dir:"* ]]; then
+    echo "Add $bin_dir to PATH, where the Go tools were installed" >&2
+fi
+
+echo "Installed the development tools"