├── tmp-test-classpath └── .gitkeep ├── .gitignore ├── CHANGELOG.md ├── project.clj ├── src └── com │ └── gfredericks │ ├── dot_slash_2 │ └── specs.clj │ └── dot_slash_2.clj ├── README.md ├── test └── com │ └── gfredericks │ └── dot_slash_2_test.clj └── LICENSE /tmp-test-classpath/.gitkeep: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | /classes 3 | /checkouts 4 | pom.xml 5 | pom.xml.asc 6 | *.jar 7 | *.class 8 | /.lein-* 9 | /.nrepl-port 10 | .hgignore 11 | .hg/ 12 | tmp-test-classpath/* -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # Change Log 2 | 3 | ## 0.1.5 - 2018-07-24 4 | 5 | A couple bugfixes in the new lazy code: 6 | - spec correctly checks that the macro? option is present when lazy? is present 7 | - docstrings and other metadata are forwarded correctly for lazy loading 8 | 9 | ## 0.1.4 - 2018-07-24 10 | 11 | - Added lazy loading 12 | 13 | ## 0.1.3 - 2018-06-20 14 | 15 | - Added renaming 16 | - Added dynamic proxying 17 | - Better error messages 18 | 19 | ## 0.1.2 - 2017-11-14 20 | 21 | - Eliminated reflection 22 | - Now updates the var when the original changes 23 | 24 | ## 0.1.1 - 2017-11-11 25 | 26 | Added error handling and metadata copying. 27 | 28 | ## 0.1.0 - 2017-11-10 29 | 30 | Initial. 31 | -------------------------------------------------------------------------------- /project.clj: -------------------------------------------------------------------------------- 1 | (defproject com.gfredericks/dot-slash-2 "0.1.6-SNAPSHOT" 2 | :description "Clojure library for easily creating proxy namespaces" 3 | :url "https://github.com/gfredericks/dot-slash-2" 4 | :license {:name "Eclipse Public License" 5 | :url "http://www.eclipse.org/legal/epl-v10.html"} 6 | :dependencies [[org.clojure/clojure "1.9.0"]] 7 | :deploy-repositories [["releases" :clojars]] 8 | :profiles {:clojure-18 9 | {:dependencies [[org.clojure/clojure "1.8.0"]]} 10 | :clojure-17 11 | {:dependencies [[org.clojure/clojure "1.7.0"]]} 12 | :dev 13 | {:source-paths ["tmp-test-classpath"]}} 14 | :aliases {"test-all" 15 | ["do" 16 | ["clean"] 17 | ["test"] 18 | ["with-profile" "+clojure-18" "test"] 19 | ["with-profile" "+clojure-17" "test"]]}) 20 | -------------------------------------------------------------------------------- /src/com/gfredericks/dot_slash_2/specs.clj: -------------------------------------------------------------------------------- 1 | (ns com.gfredericks.dot-slash-2.specs 2 | (:require 3 | [clojure.spec.alpha :as s])) 4 | 5 | (s/def :com.gfredericks.dot-slash-2/spec 6 | (s/map-of simple-symbol? 7 | (s/coll-of :com.gfredericks.dot-slash-2/var-cfg))) 8 | 9 | (defn lazy-specifies-macro? 10 | [m] 11 | (if (:lazy? m) 12 | (contains? m :macro?) 13 | true)) 14 | 15 | (s/def :com.gfredericks.dot-slash-2/var-cfg 16 | (s/or :var-only :com.gfredericks.dot-slash-2/var 17 | :map (s/and (s/keys :req-un [:com.gfredericks.dot-slash-2/var] 18 | :opt-un [:com.gfredericks.dot-slash-2/dynamic? 19 | :com.gfredericks.dot-slash-2/lazy? 20 | :com.gfredericks.dot-slash-2/macro? 21 | :com.gfredericks.dot-slash-2/name]) 22 | lazy-specifies-macro?))) 23 | 24 | (s/def :com.gfredericks.dot-slash-2/var qualified-symbol?) 25 | (s/def :com.gfredericks.dot-slash-2/dynamic? boolean?) 26 | (s/def :com.gfredericks.dot-slash-2/lazy? boolean?) 27 | (s/def :com.gfredericks.dot-slash-2/macro? boolean?) 28 | (s/def :com.gfredericks.dot-slash-2/name simple-symbol?) 29 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # dot-slash-2 2 | 3 | `dot-slash-2` is a library version of 4 | [lein-shorthand](https://github.com/palletops/lein-shorthand), which 5 | is a leiningen plugin. 6 | 7 | It lets you create namespaces with proxies to other namespaces. It is 8 | named after the idea of creating a namespace called `.` with dev 9 | utilities, to allow accessing them with the syntax `./foo` from 10 | anywhere without needing to require anything. 11 | 12 | ## Obtention 13 | 14 | `[com.gfredericks/dot-slash-2 "0.1.5"]` 15 | 16 | ## Usage 17 | 18 | ### Raw 19 | 20 | #### Basic 21 | 22 | ``` clojure 23 | (require '[com.gfredericks.dot-slash-2 :as dot-slash-2]) 24 | 25 | ;; Defines a namespace called . and adds ./doc, ./source, 26 | ;; ./run-tests, and ./refresh 27 | (dot-slash-2/! 28 | '{. [clojure.repl/doc 29 | clojure.repl/source 30 | clojure.test/run-tests 31 | clojure.tools.namespace.repl/refresh]}) 32 | ``` 33 | 34 | #### Advanced 35 | 36 | ``` clojure 37 | (require '[com.gfredericks.dot-slash-2 :as dot-slash-2]) 38 | 39 | (dot-slash-2/! 40 | '{& [{:var clojure.repl/doc 41 | ;; :name allows renaming the alias 42 | :name d} 43 | 44 | {:var user/cool-util 45 | ;; dynamic? means the var will be looked up on each call, which 46 | ;; supports namespace reloading 47 | :dynamic? true} 48 | 49 | ;; the map form can be mixed with the simple form 50 | clojure.data/diff 51 | 52 | {:var clojure.core/and 53 | ;; lazy? means the underlying namespace will not be required 54 | ;; until the first call 55 | :lazy? true 56 | ;; when using lazy? you have to indicate if it is a macro or 57 | ;; not 58 | :macro? true}]}) 59 | ``` 60 | 61 | ### Leiningen 62 | 63 | In your `project.clj` or `:user` profile or whatever: 64 | 65 | ``` clojure 66 | :injections [(do 67 | (require 'com.gfredericks.dot-slash-2) 68 | ((resolve 'com.gfredericks.dot-slash-2/!) 69 | '{. [clojure.repl/doc 70 | clojure.repl/source 71 | clojure.test/run-tests 72 | clojure.tools.namespace.repl/refresh]}))] 73 | ``` 74 | 75 | ## License 76 | 77 | Copyright © 2017 Gary Fredericks 78 | 79 | Distributed under the Eclipse Public License either version 1.0 or (at 80 | your option) any later version. 81 | -------------------------------------------------------------------------------- /test/com/gfredericks/dot_slash_2_test.clj: -------------------------------------------------------------------------------- 1 | (ns com.gfredericks.dot-slash-2-test 2 | (:require [clojure.java.shell :refer [sh]] 3 | [com.gfredericks.dot-slash-2 :as sut] 4 | [clojure.test :refer [deftest is]])) 5 | 6 | (def fifteen 14) 7 | 8 | (deftest !-test 9 | (sut/! '{$$ [clojure.test/run-tests 10 | com.gfredericks.dot-slash-2-test/fifteen] 11 | && [clojure.core/+ 12 | clojure.repl/doc 13 | {:var clojure.repl/apropos 14 | :name tompkins} 15 | {:var com.gfredericks.dot-slash-2-test/fifteen 16 | :name thirteen}]}) 17 | (is (resolve '$$/run-tests)) 18 | (is (resolve '$$/fifteen)) 19 | (is (= 14 @(resolve '$$/fifteen))) 20 | (is (resolve '&&/+)) 21 | (is (resolve '&&/tompkins)) 22 | (is (= 14 @(resolve '&&/thirteen))) 23 | (is (not (resolve '&&/apropos))) 24 | (is (= 19 ((resolve '&&/+) 25 | @(resolve '$$/fifteen) 26 | 5))) 27 | (is (thrown? Exception (eval '&&/doc))) 28 | 29 | (is (re-find #"Returns the sum of nums" 30 | (eval 31 | '(:doc (meta #'&&/+)))))) 32 | 33 | (deftest require-failure-test 34 | (let [stderr 35 | (with-out-str 36 | (binding [*err* *out*] 37 | (sut/! '{&$%&! [doesn't-exist/at-all 38 | com.gfredericks.dot-slash-2-test/fifteen]})))] 39 | (is (resolve '&$%&!/at-all) 40 | "The proxy var was created") 41 | (is (thrown-with-msg? Exception #"failed to require" 42 | (eval '(&$%&!/at-all 1 2 3))) 43 | "throws an exception if you call it") 44 | (is (re-find #"dot-slash-2 failed to require doesn't-exist" stderr)) 45 | (is (= 14 (eval '&$%&!/fifteen))))) 46 | 47 | (def mutate-me 49) 48 | 49 | (deftest update-test 50 | (sut/! '{!!! [com.gfredericks.dot-slash-2-test/mutate-me]}) 51 | (is (= 49 (eval '!!!/mutate-me))) 52 | (alter-var-root #'mutate-me inc) 53 | (is (= 50 (eval '!!!/mutate-me)))) 54 | 55 | (defn fake-require-new-ns 56 | [sym] 57 | (create-ns sym) 58 | (dosync (alter @#'clojure.core/*loaded-libs* conj sym))) 59 | 60 | (deftest dynamism-test 61 | (fake-require-new-ns 'ns-145) 62 | (intern 'ns-145 'foo-static (fn [] :old-value)) 63 | (intern 'ns-145 'foo-dynamic (fn [] :old-value)) 64 | (sut/! '{yopep [ns-145/foo-static 65 | {:var ns-145/foo-dynamic 66 | :dynamic? true}]}) 67 | (is (= :old-value (eval '(yopep/foo-static)))) 68 | (is (= :old-value (eval '(yopep/foo-dynamic)))) 69 | ;; Simulating what happens with, e.g., 70 | ;; clojure.tools.namespace.repl/refresh 71 | (remove-ns 'ns-145) 72 | (fake-require-new-ns 'ns-145) 73 | (intern 'ns-145 'foo-static (fn [] :new-value)) 74 | (intern 'ns-145 'foo-dynamic (fn [] :new-value)) 75 | (is (= :old-value (eval '(yopep/foo-static)))) 76 | (is (= :new-value (eval '(yopep/foo-dynamic))))) 77 | 78 | (deftest bad-name-test 79 | (let [stderr 80 | (with-out-str 81 | (binding [*err* *out*] 82 | (sut/! '{x2378 [clojure.test/ns-exists-but-var-doesn't]})))] 83 | (is (re-find #"dot-slash-2 .*clojure.test/ns-exists-but-var-doesn't" stderr)))) 84 | 85 | (defmacro unnecessary-adding-macro 86 | [a b] 87 | `(+ ~a ~b)) 88 | 89 | (deftest dynamic-macros-test 90 | (sut/! {'ns1894 [{:var `unnecessary-adding-macro 91 | :dynamic? true}]}) 92 | (is (= 14 (eval '(ns1894/unnecessary-adding-macro 8 6))))) 93 | 94 | (deftest lazy-test 95 | (let [ns-name (str "ns" (rand-int 0x7FFFFFFF)) 96 | fn-sym (symbol ns-name "jamboreen")] 97 | (sh "mkdir" "tmp-test-classpath") 98 | (spit (format "tmp-test-classpath/%s.clj" ns-name) 99 | (format "(ns %s) (defn jamboreen [x] x)" 100 | ns-name)) 101 | (sut/! {'ns82 [{:var fn-sym 102 | :dynamic? true 103 | :lazy? true 104 | :macro? false} 105 | {:var 'clojure.data/diff 106 | :lazy? true 107 | :macro? false}]}) 108 | (is (thrown? Exception 109 | (eval (list fn-sym :foo))) 110 | "hasn't been required yet") 111 | (is (= :foo (eval '(ns82/jamboreen :foo))) 112 | "works through the proxy, which requires it") 113 | (is (= :foo (eval (list fn-sym :foo))) 114 | "direct call works this time, proving it's been required") 115 | (eval '(ns82/diff {} {})) 116 | (is (re-find #"Recursively compares a and b" 117 | (-> 'ns82/diff resolve meta :doc)) 118 | "adds the docstring once it's been called"))) 119 | 120 | (deftest lazy-dynamic-test 121 | (sut/! {'ns4781 [{:var 'clojure.data/diff 122 | :dynamic? true 123 | :lazy? true 124 | :macro? false} 125 | {:var 'clojure.core/or 126 | :dynamic? true 127 | :lazy? true 128 | :macro? true}]}) 129 | (is (= [nil nil {}] (eval '(ns4781/diff {} {})))) 130 | (is (= 42 (eval '(ns4781/or nil false false 42 (throw (Exception. "unreachable")))))) 131 | (is (re-find #"Recursively compares a and b" 132 | (-> 'ns4781/diff resolve meta :doc)) 133 | "adds the docstring once it's been called")) 134 | -------------------------------------------------------------------------------- /src/com/gfredericks/dot_slash_2.clj: -------------------------------------------------------------------------------- 1 | (ns com.gfredericks.dot-slash-2) 2 | 3 | (try 4 | (require '[clojure.spec.alpha :as s]) 5 | (require 'com.gfredericks.dot-slash-2.specs) 6 | (eval 7 | '(do 8 | (defn valid? [spec] (s/valid? ::spec spec)) 9 | (defn explain [spec] (s/explain ::spec spec)))) 10 | (catch Exception e 11 | (eval 12 | '(do 13 | (defn valid? [spec] true) 14 | (defn explain [spec] 15 | (assert false "unreachable")))))) 16 | 17 | (defn ^:private normalize 18 | [sym-or-map] 19 | (if (symbol? sym-or-map) 20 | {:var sym-or-map} 21 | sym-or-map)) 22 | 23 | (defn ^:private require-and-resolve 24 | [sym] 25 | (let [ns-sym (symbol (namespace sym))] 26 | (try 27 | (require ns-sym) 28 | (catch Exception e 29 | (throw (Exception. (format "dot-slash-2 failed to require %s" 30 | ns-sym) 31 | e)))) 32 | (or (resolve sym) 33 | (throw (Exception. (format "dot-slash-2 failed to resolve %s" 34 | sym)))))) 35 | 36 | (defn ^:private sync-changes 37 | [proxy-var underlying-var] 38 | (add-watch underlying-var (gensym "dot-slash-2") 39 | (fn [_ _ _ new] 40 | (alter-var-root proxy-var (constantly new)) 41 | (alter-meta! proxy-var merge (meta underlying-var))))) 42 | 43 | (defn ^:private set-dynamic-docstring 44 | [proxy-var underlying-var] 45 | (alter-meta! proxy-var assoc :doc 46 | (format "Proxy to %s\n\nOriginal docs:\n\n%s\n%s" 47 | underlying-var 48 | (pr-str (:arglists (meta underlying-var))) 49 | (:doc (meta underlying-var))))) 50 | 51 | (defn ^:private setup-var 52 | [underlying-symbol new-var dynamic? lazy? macro?] 53 | (if lazy? 54 | ;; Note: a consequence of how this is done independently for each 55 | ;; var is that docstrings and other metadata aren't applied until 56 | ;; the first call, even if they're already available (e.g., if the 57 | ;; namespace is already loaded for some independent reason, or 58 | ;; even because of another call to a dot-slash var); we could at 59 | ;; least improve it to where we 60 | ;; 61 | ;; 1) check at this point if the namespace is already loaded, 62 | ;; and ignore the laziness if so 63 | ;; 2) when we process the first call to a var, realize all the 64 | ;; other vars proxying to that namespace as well; we might 65 | ;; even take the opportunity to check if any other namespaces 66 | ;; have been loaded in the meantime 67 | (let [root-value 68 | (if dynamic? 69 | (let [d (delay (set-dynamic-docstring 70 | new-var 71 | (require-and-resolve underlying-symbol)))] 72 | (fn dynamic-var-proxy [& args] 73 | (force d) 74 | (apply (require-and-resolve underlying-symbol) args))) 75 | (fn one-time-lazy-stub [& args] 76 | (let [underlying-var (require-and-resolve underlying-symbol)] 77 | (doto new-var 78 | (alter-var-root (constantly @underlying-var)) 79 | (alter-meta! merge (meta underlying-var)) 80 | (sync-changes underlying-var)) 81 | (apply @new-var args))))] 82 | (doto new-var 83 | (alter-var-root (constantly root-value)) 84 | (cond-> macro? .setMacro))) 85 | (let [underlying-var (delay (require-and-resolve underlying-symbol))] 86 | (and 87 | (try 88 | (deref underlying-var) 89 | (catch Exception e 90 | (binding [*out* *err*] 91 | (printf "WARNING: %s\n(calls to %s will fail)\n" 92 | (.getMessage e) 93 | new-var)) 94 | (alter-var-root new-var 95 | (constantly 96 | (fn ex-rethrower [& args] (deref underlying-var)))) 97 | false)) 98 | (let [underlying-var @underlying-var 99 | root-value (if dynamic? 100 | (fn [& args] 101 | (apply (require-and-resolve underlying-symbol) args)) 102 | @underlying-var)] 103 | (doto new-var 104 | (alter-var-root (constantly root-value)) 105 | (alter-meta! merge (meta underlying-var)) 106 | (cond-> (.isMacro underlying-var) .setMacro) 107 | (cond-> dynamic? (set-dynamic-docstring underlying-var)) 108 | (cond-> (not dynamic?) (sync-changes underlying-var)))))))) 109 | 110 | (defn ! 111 | "Defines namespaces and proxy vars based on the given spec. 112 | 113 | E.g.: 114 | 115 | '{. [clojure.test/run-tests 116 | clojure.repl/doc]} 117 | 118 | will create (if necessary) a namespace called ., containing 119 | a function called run-tests and a macro called doc." 120 | ;; TODO: 121 | ;; - renaming 122 | ;; - laziness 123 | [spec] 124 | (if (valid? spec) 125 | (doseq [[ns-name vars-and-things] spec] 126 | (create-ns ns-name) 127 | (doseq [sym-or-map vars-and-things 128 | :let [{sym :var 129 | proxy-name :name 130 | :keys [dynamic? lazy? macro?]} 131 | (normalize sym-or-map) 132 | 133 | its-ns (symbol (namespace sym)) 134 | 135 | proxy-name (or proxy-name (symbol (name sym))) 136 | new-var (intern ns-name proxy-name)]] 137 | (setup-var sym new-var dynamic? lazy? macro?))) 138 | (binding [*out* *err*] 139 | (println "Bad arg to dot-slash-2/!:") 140 | (explain spec)))) 141 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC 2 | LICENSE ("AGREEMENT"). 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