6ab65a30e3
Shaking the ring-app example's real library stack out against jolt surfaced a
batch of divergences from JVM Clojure, the biggest being evaluation order.
backend_scheme: call and recur arguments were emitted as bare Scheme operands,
so Chez's unspecified (right-to-left) order won out. Clojure evaluates left to
right, which selmer's reader loop relies on: (recur (add-node ... rdr) (read-char
rdr)) consumed a char early and dropped the first chars of every {{tag}}. Bind
operands to fresh temps in a let* (only when two or more can have side effects,
so hot calls over locals/consts stay un-wrapped). emit-ordered already did this
for collection literals; generalize it.
host-contract: syntax-quote now resolves the alias part of a qualified symbol
(impl/foo -> clojure.tools.logging.impl/foo) instead of leaving it bare, which
limped along via short-name matching until two loaded namespaces (reitit.impl,
clojure.tools.logging.impl) shared the short name and it broke.
collections: key-hash masks with bitwise-and, not fxand — jolt-hash is set!-
decorated per type (records return their own hash) and Chez's equal-hash can be a
bignum, so a key's hash isn't always a fixnum.
seq: even?/odd? handle bignums (JVM accepts any integer; the fxand crashed).
records: Keyword/Symbol .sym/.getName/.toString (honeysql's :clj branch reads
(.sym k)); Throwable .getMessage/.toString over a Chez condition.
host-static: __register-class-ctor!/__register-class-statics! so a host shim
(reitit.trie-jolt) can mirror a Java class.
natives-str: String.intern returns the string.
sqlite: jdbc.core fetch/fetch-one kebab-case column keys (the jolt-lang/db
convention; created_at -> :created-at).
io: a relative io/file path resolves against JOLT_PWD (the user's cwd), not the
repo root the launcher cd'd to — matches JVM cwd semantics, so config.edn loads.
cli: render an uncaught jolt throw (ex-info message + ex-data, or a condition)
instead of Chez's opaque "non-condition value" dump.
70 lines
3.4 KiB
Scheme
70 lines
3.4 KiB
Scheme
;; cli.ss (jolt-9phg / jolt-90sp) — the pure-Chez jolt runtime. NO Janet.
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;;
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;; Loads the checked-in seed (host/chez/seed/{prelude,image}.ss — the bootstrap
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;; compiler) and the zero-Janet spine, then either evaluates a -e expression or
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;; dispatches a CLI command (run/-M/repl/path/task) through jolt.main. The loader
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;; (loader.ss) turns `require` into real file loading off the source roots, so a
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;; multi-file project with deps.edn dependencies runs end to end.
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;;
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;; Run from the repo root (bin/joltc cd's there); the project dir is JOLT_PWD.
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(import (chezscheme))
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(define cli-args (cdr (command-line))) ; drop the script name
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(load "host/chez/rt.ss")
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(set-chez-ns! "clojure.core")
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(load "host/chez/seed/prelude.ss")
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(load "host/chez/post-prelude.ss")
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(set-chez-ns! "user")
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(load "host/chez/host-contract.ss")
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(load "host/chez/seed/image.ss")
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(load "host/chez/compile-eval.ss")
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(load "host/chez/png.ss") ; jolt.png — a baked namespace before the snapshot
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(load "host/chez/http-client.ss") ; jolt.http-client (libcurl)
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(load "host/chez/sqlite.ss") ; jolt.sqlite + jdbc.core (libsqlite3)
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(load "host/chez/http-server.ss") ; jolt.http.server + ring-janet.adapter (BSD sockets)
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(load "host/chez/loader.ss")
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;; jolt.main + jolt.deps live under jolt-core; keep them (and src/jolt) on the
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;; roots so the CLI's own namespaces — and any jolt.* an app pulls in — resolve.
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;; A project's resolved deps roots are prepended to these by jolt.main.
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(set-source-roots! (list "jolt-core" "src/jolt"))
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;; Render an uncaught jolt throw (any value, not just a Chez condition) to stderr
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;; and exit non-zero, instead of Chez's opaque "non-condition value" dump. An
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;; ex-info shows its message + ex-data; anything else is pr-str'd.
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(define (jolt-report-uncaught v)
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(let ((port (current-error-port)))
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(if (and (jolt=2 (jolt-get v jolt-kw-ex-type jolt-nil) jolt-kw-ex-info))
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(begin
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(display "Unhandled exception: " port)
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(display (jolt-str-render-one (jolt-get v jolt-kw-message jolt-nil)) port)
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(newline port)
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(let ((data (jolt-get v jolt-kw-data jolt-nil)))
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(unless (jolt-nil? data)
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(display " ex-data: " port) (display (jolt-pr-str data) port) (newline port)))
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(let ((cause (jolt-get v jolt-kw-cause jolt-nil)))
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(when (condition? cause)
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(display " cause: " port)
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(display (with-output-to-string (lambda () (display-condition cause))) port)
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(newline port))))
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(begin
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(display "Unhandled exception: " port)
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(display (if (condition? v) (with-output-to-string (lambda () (display-condition v))) (jolt-pr-str v)) port)
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(newline port)))
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(exit 1)))
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(guard (v (#t (jolt-report-uncaught v)))
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(cond
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;; -e EXPR — evaluate one expression and print it (blank for nil). Wrapped in
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;; (do …) so a multi-form string evaluates every form and returns the last.
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((and (= (length cli-args) 2) (string=? (car cli-args) "-e"))
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(let ((result (jolt-final-str
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(jolt-compile-eval (string-append "(do " (cadr cli-args) ")") "user"))))
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(unless (string=? result "")
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(display result) (newline))))
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;; otherwise dispatch the argv through jolt.main/-main
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(else
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(load-namespace "jolt.main")
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(let ((mainv (var-deref "jolt.main" "-main")))
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(apply jolt-invoke mainv cli-args)))))
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