Add -Aversion command-line option; fixes #3381

changelog.txt

@@ -1,5 +1,7 @@
 Version 3.6.0, August 3, 2020
 
+Added a new option `-Aversion` to print the version of the Checker Framework.
+
 The Interning Checker supports method annotations @EqualsMethod and
 @CompareToMethod.  Place them on methods like equals(), compareTo(), and
 compare() to permit certain uses of == on non-interned values.

docs/manual/introduction.tex

@@ -788,6 +788,10 @@
  \<-AatfCacheSize>
 Miscellaneous debugging options; see Section~\ref{creating-debugging-options-misc}.
 
+\item
+ \<-Aversion>
+Print the Checker Framework version.
+
 \item
  \<-AprintGitProperties>
 Print information about the git repository from which the Checker Framework

framework/src/main/java/org/checkerframework/framework/source/SourceChecker.java

@@ -253,6 +253,8 @@
 
     /// Amount of detail in messages
 
+    // Print the version of the Checker Framework
+    "version",
     // Print info about git repository from which the Checker Framework was compiled
     "printGitProperties",
 
@@ -781,6 +783,9 @@ public void run() {
                                     }
                                 });
             }
+            if (hasOption("version")) {
+                messager.printMessage(Kind.NOTE, "Checker Framework " + getCheckerVersion());
+            }
         } catch (UserError ce) {
             logUserError(ce);
         } catch (TypeSystemError ce) {
@@ -2530,4 +2535,18 @@ private void printGitProperties() {
             System.out.println("IOException while reading git.properties: " + e.getMessage());
         }
     }
+
+    /**
+     * Returns the version of the Checker Framework.
+     *
+     * @return Checker Framework version
+     */
+    private String getCheckerVersion() {
+        Properties gitProperties = getProperties(getClass(), "/git.properties");
+        String version = gitProperties.getProperty("git.build.version");
+        if (version != null) {
+            return version;
+        }
+        throw new BugInCF("Could not find the version in git.properties");
+    }
 }