Merge pull request #87 from sasjs/mp_wait4file

mp_wait4file macro

.github/workflows/run-tests.yml

@@ -12,12 +12,12 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x]
+        node-version: [lts/fermium]
 
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
 

base/mp_wait4file.sas

@@ -0,0 +1,37 @@
+/**
+  @file
+  @brief Wait until a file arrives before continuing execution
+  @details Loops with a `sleep()` command until a file arrives or the max wait
+  period expires.
+
+  @example
+
+  Wait 3 minutes OR for /tmp/flag.txt to appear
+
+    %mp_wait4file(/tmp/flag.txt , maxwait=60*3)
+
+  @param [in] file The file to wait for.  Must be provided.
+  @param [in] maxwait= (0) Number of seconds to wait.  If set to zero, will
+    loop indefinitely (to a maximum of 46 days, per SAS [documentation](
+      https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a001418809.htm
+    )).  Otherwise, execution will proceed upon sleep expiry.
+  @param [in] interval= (1) The wait period between sleeps, in seconds
+
+
+**/
+
+%macro mp_wait4file(file, maxwait=0, interval=1);
+
+%if %str(&file)=%str() %then %do;
+  %put %str(ERR)OR: file not provided;
+%end;
+
+data _null_;
+  maxwait=&maxwait;
+  if maxwait=0 then maxwait=60*60*24*46;
+  do until (fileexist("&file") or slept>maxwait );
+    slept=sum(slept,sleep(&interval,1));
+  end;
+run;
+
+%mend mp_wait4file;

package.json

@@ -33,7 +33,6 @@
     "prepare": "git rev-parse --git-dir && git config core.hooksPath ./.git-hooks || true"
   },
   "devDependencies": {
-    "@sasjs/cli": "^2.38.8",
-    "all-contributors-cli": "^6.20.0"
+    "@sasjs/cli": "^2.39.0"
   }
 }