823bc5bcc6
Match babashka's spelling: the nREPL server now starts with `bin/joltc --nrepl-server [port]` instead of `bin/joltc nrepl`. Port parsing and JOLT_NREPL_PORT are unchanged. Also wire up --help/-h to print usage (previously only the no-arg invocation did), and fix the usage listing to show the real flag. Smoke now asserts --help mentions --nrepl-server. Docs updated to match.
113 lines
4.6 KiB
Markdown
113 lines
4.6 KiB
Markdown
# Building and dependencies
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How to run Jolt from source and how to pull Clojure libraries into a project.
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## Running
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```bash
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git clone https://github.com/jolt-lang/jolt.git
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cd jolt
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git submodule update --init # vendor/sci (used by the SCI bootstrap tests)
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bin/joltc -e '(println "hello")'
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```
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There is **no build step**. `bin/joltc` (`host/chez/cli.ss`) loads the
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checked-in bootstrap seed (`host/chez/seed/{prelude,image}.ss`) plus the spine
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and compiles+evals on Chez (read → analyze → IR → emit → eval), so a fresh
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clone runs immediately. The whole `.clj` standard library
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(`clojure.string`/`set`/`walk`/`edn`/`pprint`/…) and `clojure.core` are part of
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the overlay, so they're always available.
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`bin/joltc` is both the runtime (REPL, file/expr runner) and the dependency
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front-end (`deps.edn` resolution, see below). A run with no `deps.edn` never
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touches the resolver.
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The bootstrap seed is **checked in**. After changing a seed source — the reader
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(`host/chez/reader.ss`), the analyzer/IR/backend (`jolt-core/jolt/*.clj`), or the
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`clojure.core` overlay (`jolt-core/clojure/core/*.clj`) — re-mint the seed with
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`make remint` (it iterates `host/chez/bootstrap.ss` to a byte-fixpoint), or
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`make selfhost` fails. Runtime-only `host/chez/*.ss` shims don't need a re-mint.
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## How namespaces are found
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`(require ...)` resolves a namespace to a file by searching an ordered list of
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source roots — the stdlib first, then any extra roots — trying `<ns>.clj` then
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`<ns>.cljc` (dots become directories, dashes become underscores). Extra roots
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come from:
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- `JOLT_PATH` — a colon-separated list of directories (like a classpath), applied
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at runtime;
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- the `:paths` option to `init` when embedding Jolt as a library.
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If a namespace isn't found on any root, the loader falls back to the stdlib in
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the overlay — that's how `clojure.string` and friends resolve when you run
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outside the source tree.
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So you can point Jolt at a directory of Clojure source with no deps machinery at
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all:
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```bash
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JOLT_PATH=/path/to/lib/src bin/joltc run myfile.clj
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```
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## Dependencies via deps.edn
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`bin/joltc` reads a `deps.edn` in the current directory, fetches its
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dependencies, and prepends the resolved source directories to the source roots
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for the run. The CLI commands (`jolt.deps` + `jolt.main`):
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```bash
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bin/joltc run -m NS [args] # resolve deps.edn, load NS, call its -main
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bin/joltc run FILE # resolve deps.edn, load a Clojure file
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bin/joltc -M:alias [args] # run the alias's :main-opts
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bin/joltc -A:alias [args] # add the alias's paths/deps, then run the rest
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bin/joltc repl # start a line REPL (project deps + native libs loaded)
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bin/joltc --nrepl-server [port] # start an nREPL server (default 7888) for editors
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bin/joltc path # print the resolved source roots (':'-joined)
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bin/joltc <task> # run a deps.edn :tasks entry
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```
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Example `deps.edn`:
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```clojure
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{:paths ["src"]
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:deps {weavejester/medley {:git/url "https://github.com/weavejester/medley"
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:git/sha "<full-sha>"}
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my/helpers {:local/root "../helpers"}}}
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```
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```bash
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bin/joltc run -m myapp.main
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```
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### What's supported
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- **git deps** — `{:git/url … :git/sha …}` (use a full SHA; `git fetch` can't
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resolve a short one), with an optional `:deps/root` for a subdirectory.
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Transitive deps from each dependency's own `deps.edn` are resolved too.
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- **local deps** — `{:local/root "../path"}`.
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- The project's own `:paths` (default `["src"]`) are included.
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- **aliases** — `:aliases {:dev {:extra-paths ["dev"] :extra-deps {…}
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:main-opts ["-e" "…"]}}`, selected with `-A:dev` (or several: `-A:dev:test`).
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`:extra-paths`/`:extra-deps` accumulate across selected aliases;
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`:main-opts` is last-wins and runs via `-M:alias`.
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- **tasks** — `:tasks {clean "rm -rf target" test {:main-opts ["-m" "…"]}}`.
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A string task is a shell command; a map task runs jolt with its `:main-opts`.
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Run one with `bin/joltc <taskname>`.
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Resolution is breadth-first, so a top-level coordinate always beats a transitive
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one for the same lib.
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Git clones land in a global, sha-immutable cache shared across projects —
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`$JOLT_GITLIBS`, else `~/.jolt/gitlibs`.
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### What's not
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- **No Maven.** `:mvn/version` deps are skipped with a warning — git and local
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only.
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- **Pure `clj`/`cljc` only.** A library that needs the JVM (Java interop, host
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classes) or a `clojure.core` feature Jolt doesn't implement will fail to load
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or fail at a call. Coverage is per-function: a namespace can load with most
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functions working and a few not.
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See [`tools-deps.md`](tools-deps.md) for the design rationale.
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