ICU-22773 Migrate the CLDR conversion tool to Maven

.github/adaboost.json

@@ -1,6 +1,6 @@
 // © 2022 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
-// Generated using tools/cldr/cldr-to-icu/build-icu-data.xml
+// Generated using tools/cldr/cldr-to-icu/
 //
 // Include Japanese adaboost model.
 {

.github/lstm_for_th_my.json

@@ -1,6 +1,6 @@
 // © 2021 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
-// Generated using tools/cldr/cldr-to-icu/build-icu-data.xml
+// Generated using tools/cldr/cldr-to-icu/
 //
 // Include Burmese and Thai lstm models.
 {

docs/processes/release/tasks/versions.md

@@ -53,6 +53,13 @@ need to be correspondingly updated. See below for more files to be updated and s
 [icu4c/source/data/misc/icuver.txt](https://github.com/unicode-org/icu/blob/main/icu4c/source/data/misc/icuver.txt)
 needs to be updated with the correct version number for ICU and its data.
 
+#### Since ICU 77
+
+The tool takes the `icuVersion` and `icuDataVersion` from the official ICU APIs.
+(from the icu4j listed as a dependency of the tool, usually the one you just built from the `icu4j` folder).
+
+If you need values different than that, you can specify them as the command line parameters (`--icuVersion` and `--icuDataVersion`).
+
 #### Since ICU 68
 
 In
@@ -212,8 +219,18 @@ The command requires a version number string that follows the typical Java / Mav
 
 6. cldr-to-icu build tool has a dependency on the icu4j packages which needs to be updated in [`tools/cldr/cldr-to-icu/pom.xml`](https://github.com/unicode-org/icu/blob/main/tools/cldr/cldr-to-icu/pom.xml). Please update it to match the version that was updated in `icu4j/pom.xml` in the steps above.
 
-    `<version>74.0.1-SNAPSHOT</version>`
+```xml
+version>74.0.1-SNAPSHOT</version>
+```
 
+Since ICU 77 this moved to a property:
+```xml
+<icu4j.version>77.0.1-SNAPSHOT</icu4j.version>
+```
+Which can be easily be set from command line:
+```sh
+mvn versions:set-property -Dproperty=icu4j.version -DnewVersion=77.1 -f $ICU_DIR/tools/cldr/cldr-to-icu
+```
 
 #### Until ICU 73 (inclusive)
 

icu4c/source/data/unidata/changes.txt

@@ -290,6 +290,8 @@ copying that version number into the $ICU_SRC/.bazeliskrc config file.
 - run Unicode Tools GenerateUnihanCollators & GenerateUnihanCollatorFiles,
   check CLDR diffs, copy to CLDR, test CLDR, ... as documented there
 - generate ICU zh collation data
+    WARNING: outdated, don't do this, follow the tools/cldr/cldr-to-icu/README.md file!
+    --- Old text from here:
     instructions inspired by
     https://github.com/unicode-org/icu/blob/main/tools/cldr/cldr-to-icu/README.txt and
     https://github.com/unicode-org/icu/blob/main/icu4c/source/data/cldr-icu-readme.txt

tools/cldr/.gitignore

@@ -1,9 +1,4 @@
-# Exclude the Maven local repository but keep the lib directory and the top-level readme, scripts and build config.
-/lib/**
-!/lib/README.txt
-!/lib/install-cldr-jars.sh
-!/lib/pom.xml
-
-# Ignore the default Maven target directory.
-/cldr-to-icu/target
-
+# Eclipse IDE generated files
+.classpath
+.project
+.settings/

tools/cldr/build.xml

@@ -3,7 +3,7 @@
 
 <!-- This build file is intended to become the single mechanism for working with CLDR
      code and data when building ICU data.
-     
+
      Eventually it will encompass:
      * Building ICU data form CLDR data via cldr-to-icu.
      * Building the CLDR libraries needed to support ICU data conversion.
@@ -70,23 +70,4 @@
         <delete dir="${testDataDir4J}"/>
     </target>
 
-    <!-- Builds the ICU data, using the Ant build file in the cldr-to-icu directory and passing.
-         through any specified arguments for controlling the build. If you need more control when
-         building ICU data (such as incrementally building parts of the data), you should use the
-         build-icu-data.xml file directly. -->
-    <target name="build-icu-data">
-        <ant dir="cldr-to-icu" antfile="build-icu-data.xml" target="all" inheritAll="true"/>
-    </target>
-
-    <!-- Deletes generated ICU data by invoking "clean" in cldr-to-icu/build-icu-data.xml -->
-    <target name="clean-icu-data">
-        <ant dir="cldr-to-icu" antfile="build-icu-data.xml" target="clean" inheritAll="true"/>
-    </target>
-
-    <!-- Installs the CLDR library dependencies needed for building ICU data. -->
-    <target name="install-cldr-libs" depends="init-args">
-        <exec dir="lib" executable="install-cldr-jars.sh" resolveexecutable="true" failonerror="true">
-            <arg line="${cldrDir}"/>
-        </exec>
-    </target>
 </project>