[#179] Current file path: *file*

README.md

@@ -243,6 +243,19 @@ $ echo '{:a 1} {:a 2}' | bb --stream '*input*'
 {:a 2}
 ```
 
+### Current file path
+
+This variable `*file*` contains the full path of the file that is currently
+being executed:
+
+``` shellsession
+$ cat example.clj
+(prn *file*)
+
+$ bb example.clj
+"/Users/borkdude/example.clj"
+```
+
 ### Command-line arguments
 
 Command-line arguments can be retrieved using `*command-line-args*`.

sci

@@ -1 +1 @@
-Subproject commit 278932006626278a29b2ce4307d332531ff8af9d
+Subproject commit abe867b9fbc01828728e2216f17f879cc2e9e2ac

src/babashka/impl/classpath.clj

@@ -14,7 +14,8 @@
   (getResource [this resource-path]
     (let [f (io/file path resource-path)]
       (when (.exists f)
-        (slurp f)))))
+        {:file (.getCanonicalPath f)
+         :source (slurp f)}))))
 
 (defn path-from-jar
   [^java.io.File jar-file path]
@@ -23,7 +24,8 @@
           entry (some (fn [^JarFile$JarFileEntry x]
                         (let [nm (.getName x)]
                           (when (and (not (.isDirectory x)) (= path nm))
-                            (slurp (.getInputStream jar x))))) entries)]
+                            {:file path
+                             :source (slurp (.getInputStream jar x))}))) entries)]
       entry)))
 
 (deftype JarFileResolver [path]
@@ -58,5 +60,5 @@
 (comment
   (def l (loader "src:/Users/borkdude/.m2/repository/cheshire/cheshire/5.9.0/cheshire-5.9.0.jar"))
   (source-for-namespace l 'babashka.impl.cheshire)
-  (source-for-namespace l 'cheshire.core)
+  (:file (source-for-namespace l 'cheshire.core))
   )

src/babashka/main.clj

@@ -20,7 +20,9 @@
    [clojure.java.shell :as shell]
    [clojure.string :as str]
    [sci.addons :as addons]
-   [sci.core :as sci])
+   [sci.core :as sci]
+   [sci.impl.vars :as vars]
+   [sci.impl.namespaces :as sci-namespaces])
   (:gen-class))
 
 (set! *warn-on-reflection* true)
@@ -167,9 +169,11 @@ Everything after that is bound to *command-line-args*."))
   (edn/read {;;:readers *data-readers*
              :eof ::EOF} *in*))
 
-(defn load-file* [ctx file]
-  (let [s (slurp file)]
-    (eval-string s ctx)))
+(defn load-file* [ctx f]
+  (let [f (io/file f)
+        s (slurp f)]
+    (sci/with-bindings {vars/file-var (.getCanonicalPath f)}
+      (eval-string s ctx))))
 
 (defn eval* [ctx form]
   (eval-string (pr-str form) ctx))
@@ -230,6 +234,7 @@ Everything after that is bound to *command-line-args*."))
         load-fn (when classpath
                   (fn [{:keys [:namespace]}]
                     (cp/source-for-namespace loader namespace)))
+        _ (when file (vars/bindRoot vars/file-var (.getCanonicalPath (io/file file))))
         ctx {:aliases '{tools.cli 'clojure.tools.cli
                         edn clojure.edn
                         wait babashka.wait
@@ -241,7 +246,8 @@ Everything after that is bound to *command-line-args*."))
                         json cheshire.core}
              :namespaces {'clojure.core (assoc core-extras
                                                '*command-line-args*
-                                               (sci/new-dynamic-var '*command-line-args* command-line-args))
+                                               (sci/new-dynamic-var '*command-line-args* command-line-args)
+                                               '*file* vars/file-var)
                           'clojure.tools.cli tools-cli-namespace
                           'clojure.edn {'read edn/read
                                         'read-string edn/read-string}
@@ -272,7 +278,8 @@ Everything after that is bound to *command-line-args*."))
                         System java.lang.System
                         Thread java.lang.Thread}
              :load-fn load-fn}
-        ctx (update ctx :bindings assoc 'eval #(eval* ctx %)
+        ctx (update-in ctx [:namespaces 'clojure.core] assoc
+                       'eval #(eval* ctx %)
                        'load-file #(load-file* ctx %))
         ctx (addons/future ctx)
         _preloads (some-> (System/getenv "BABASHKA_PRELOADS") (str/trim) (eval-string ctx))

test/babashka/file_var_test.clj

@@ -0,0 +1,17 @@
+(ns babashka.file-var-test
+  (:require
+   [babashka.test-utils :as tu]
+   [clojure.test :as t :refer [deftest is]]
+   [clojure.string :as str]))
+
+(defn bb [input & args]
+  (apply tu/bb (when (some? input) (str input)) (map str args)))
+
+(deftest file-var-test
+  (let [[f1 f2 f3]
+        (str/split (bb nil "--classpath" "test/babashka/scripts"
+                       "test/babashka/scripts/file_var.bb")
+                   #"\n")]
+    (is (str/ends-with? f1 "file_var_classpath.bb"))
+    (is (str/ends-with? f2 "loaded_by_file_var.bb"))
+    (is (str/ends-with? f3 "file_var.bb"))))

test/babashka/scripts/file_var.bb

@@ -0,0 +1,6 @@
+(ns file-var
+  (:require [clojure.java.io :as io]))
+
+(require '[file-var-classpath])
+(load-file (io/file "test" "babashka" "scripts" "loaded_by_file_var.bb"))
+(println *file*)

test/babashka/scripts/file_var_classpath.bb

@@ -0,0 +1 @@
+(println *file*)

test/babashka/scripts/loaded_by_file_var.bb

@@ -0,0 +1,3 @@
+(ns loaded-by-file-var)
+
+(println *file*)