Automatically update WEEK_4 WEEK_12 versions (openxla#2585)

This PR adds `update_version_h_cpp.sh` script

The script will:
- Automatically calculate `WEEK_4` and `WEEK_12` versions based on
Version tag date and current date.
- Bump CurrentVersion by increasing patch version by 1 

This script should be executed at the beginning of the next development
cycle, after performing the git tagging.

This script:
1. Updates current version in `stablehlo/dialect/Version.h`

```cpp 
  static Version getCurrentVersion() { return Version(x, y, z); }
```
New version will be (x, y, z + 1)

2. Replaces WEEK_4 and WEEK12 versions in stablehlo/dialect/Version.cpp
```
      return Version(a, b, c);  // WEEK_4 ANCHOR: DO NOT MODIFY
      return Version(m, n, p);  // WEEK_12 ANCHOR: DO NOT MODIFY
```
- WEEK_4 version - The most recent git tag that was created at least 28
days ago.
- WEEK_12 version - The most recent git tag that was created at least 84
days ago.

### Usage Example:

```bash
$ build_tools/update_version_h_cpp.sh

Next Current Version: 1, 8, 3
WEEK_4 Version: 1, 7, 6
WEEK_12 Version: 1, 5, 1
Saving /local/home/user/workspace/stablehlo/build_tools/../stablehlo/dialect/Version.h...
  static Version getCurrentVersion() { return Version(1, 8, 3); }
Saving /local/home/user/workspace/stablehlo/build_tools/../stablehlo/dialect/Version.cpp...
      return Version(1, 7, 6);  // WEEK_4 ANCHOR: DO NOT MODIFY
      return Version(1, 5, 1);  // WEEK_12 ANCHOR: DO NOT MODIFY
Done
```

#### Result:

```bash
$ git diff
diff --git a/stablehlo/dialect/Version.cpp b/stablehlo/dialect/Version.cpp
index b4ea0d21..d107ba57 100644
--- a/stablehlo/dialect/Version.cpp
+++ b/stablehlo/dialect/Version.cpp
@@ -83,9 +83,9 @@ Version Version::fromCompatibilityRequirement(
     case CompatibilityRequirement::NONE:
       return Version::getCurrentVersion();
     case CompatibilityRequirement::WEEK_4:
-      return Version(1, 7, 5);  // WEEK_4 ANCHOR: DO NOT MODIFY
+      return Version(1, 7, 6);  // WEEK_4 ANCHOR: DO NOT MODIFY
     case CompatibilityRequirement::WEEK_12:
-      return Version(1, 5, 0);  // WEEK_12 ANCHOR: DO NOT MODIFY
+      return Version(1, 5, 1);  // WEEK_12 ANCHOR: DO NOT MODIFY
     case CompatibilityRequirement::MAX:
       return Version::getMinimumVersion();
   }
diff --git a/stablehlo/dialect/Version.h b/stablehlo/dialect/Version.h
index 2ea74427..a6fea6b3 100644
--- a/stablehlo/dialect/Version.h
+++ b/stablehlo/dialect/Version.h
@@ -38,7 +38,7 @@ class Version {
   static FailureOr<Version> fromString(llvm::StringRef versionRef);
 
   /// Return a Version representing the current VHLO dialect version.
-  static Version getCurrentVersion() { return Version(1, 8, 2); }
+  static Version getCurrentVersion() { return Version(1, 8, 3); }
 
   /// Return a Version representing the minimum supported VHLO dialect version.
   static Version getMinimumVersion() { return Version(0, 9, 0); }

```

build_tools/update_version_h_cpp.sh

@@ -0,0 +1,124 @@
+#!/bin/bash
+# Copyright 2024 The StableHLO Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script:
+# 1. Replaces current version in stablehlo/dialect/Version.h with the next
+# patch version
+#  static Version getCurrentVersion() { return Version(x, y, z); }
+# new version will be (x, y, z + 1)
+# 2. Replaces WEEK_4 and WEEK12 versions in stablehlo/dialect/Version.cpp
+#      return Version(a, b, c);  // WEEK_4 ANCHOR: DO NOT MODIFY
+#      return Version(m, n, p);  // WEEK_12 ANCHOR: DO NOT MODIFY
+# WEEK_4 version - The most recent git tag that was created at least 28 days ago.
+# WEEK_12 version - The most recent git tag that was created at least 84 days ago.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+script_dir="$(dirname "$(realpath "$0")")"
+version_h="$script_dir/../stablehlo/dialect/Version.h"
+version_cpp="$script_dir/../stablehlo/dialect/Version.cpp"
+
+fetch_current_version() {
+  # getCurrentVersion() { Version(X, Y, Z); }
+  ver_str=$(grep -A1 getCurrentVersion "$version_h" | grep -o 'Version(.*[0-9])')
+  REGEX="Version\(([0-9]+), ([0-9]+), ([0-9]+)\)"
+  if [[ $ver_str =~ $REGEX ]]; then
+    curr_ver=("${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}" "${BASH_REMATCH[3]}")
+  else
+    echo "Error: Could not find current version string in $version_h" >&2
+    exit 1
+  fi
+}
+fetch_current_version
+
+# calculate next current ver (patch ver + 1)
+next_curr_z=$((curr_ver[2] + 1))
+
+utc_time=$(date -u +%s)
+
+week_4_tag=""
+week_12_tag=""
+
+while IFS= read -r line; do
+    # split line CSV
+    IFS=',' read -r tag_ts tag_v <<< "$line"
+    ts_diff=$(( (utc_time - tag_ts) / 86400 ))
+
+    if [ -z "$week_4_tag" ] && [ "$ts_diff" -ge 28 ]; then
+        week_4_tag=$tag_v
+    fi
+
+    if [ -z "$week_12_tag" ] && [ "$ts_diff" -ge 84 ]; then
+        week_12_tag=$tag_v
+        break
+    fi
+done < <(git for-each-ref --sort=taggerdate --format '%(taggerdate:unix),%(refname:short)' refs/tags | tail -40 | tac)
+
+if [ -z "$week_4_tag" ] || [ -z "$week_12_tag" ]; then
+  echo "Error: WEEK_4 or WEEK_12 tag not found." >&2
+  exit 1
+fi
+
+week_4_tag=$(echo "$week_4_tag" | sed -n 's/.*v\([0-9]\+\)\.\([0-9]\+\)\.\([0-9]\+\).*/\1, \2, \3/p')
+week_12_tag=$(echo "$week_12_tag" | sed -n 's/.*v\([0-9]\+\)\.\([0-9]\+\)\.\([0-9]\+\).*/\1, \2, \3/p')
+
+if [ -z "$week_4_tag" ] || [ -z "$week_12_tag" ]; then
+  echo "Error: Unable to parse the WEEK_4 or WEEK_12 tag" >&2
+  exit 1
+fi
+
+echo "Next Current Version: ${curr_ver[0]}, ${curr_ver[1]}, $next_curr_z" >&2
+echo "WEEK_4 Version: $week_4_tag" >&2
+echo "WEEK_12 Version: $week_12_tag" >&2
+
+# Saving Version.h values
+echo "Saving $version_h..." >&2
+
+sed -i -E \
+-e "s/(static Version getCurrentVersion\(\) \{ return Version\()([0-9]+), ([0-9]+), ([0-9]+)(\); \})/\1\2, \3, $next_curr_z\5/" \
+"$version_h"
+
+# Checking Version.h values
+grep "static Version getCurrentVersion()" "$version_h" >&2
+
+if [ "$(grep -c "static Version getCurrentVersion() { return Version(${curr_ver[0]}, ${curr_ver[1]}, $next_curr_z); }" "$version_h")" -ne 1 ]; then
+    echo "ERROR: getCurrentVersion() version is not correct" >&2
+    exit 1
+fi
+
+# Saving Version.cpp values
+echo "Saving $version_cpp..." >&2
+
+sed -i -E \
+-e "s/(return Version\()([0-9]+), ([0-9]+), ([0-9]+)(\);\s+\/\/ WEEK_4 ANCHOR: DO NOT MODIFY)/\1$week_4_tag\5/" \
+-e "s/(return Version\()([0-9]+), ([0-9]+), ([0-9]+)(\);\s+\/\/ WEEK_12 ANCHOR: DO NOT MODIFY)/\1$week_12_tag\5/" \
+"$version_cpp"
+
+# Checking Version.cpp values
+grep "WEEK_4 ANCHOR: DO NOT MODIFY" "$version_cpp" >&2
+grep "WEEK_12 ANCHOR: DO NOT MODIFY" "$version_cpp" >&2
+
+if [ "$(grep -c -E "return Version\($week_4_tag\);\s+\/\/ WEEK_4 ANCHOR: DO NOT MODIFY" "$version_cpp")" -ne 1 ]; then
+    echo "ERROR: WEEK_4 version is not correct" >&2
+    exit 1
+fi
+
+if [ "$(grep -c -E "return Version\($week_12_tag\);\s+\/\/ WEEK_12 ANCHOR: DO NOT MODIFY" "$version_cpp")" -ne 1 ]; then
+    echo "ERROR: WEEK_12 version is not correct" >&2
+    exit 1
+fi
+
+echo "Done" >&2

stablehlo/dialect/Version.cpp

@@ -83,9 +83,9 @@ Version Version::fromCompatibilityRequirement(
     case CompatibilityRequirement::NONE:
       return Version::getCurrentVersion();
     case CompatibilityRequirement::WEEK_4:
-      return Version(1, 7, 5);  // Sep 26, 2024
+      return Version(1, 7, 5);  // WEEK_4 ANCHOR: DO NOT MODIFY
     case CompatibilityRequirement::WEEK_12:
-      return Version(1, 5, 0);  // Aug 1, 2024
+      return Version(1, 5, 0);  // WEEK_12 ANCHOR: DO NOT MODIFY
     case CompatibilityRequirement::MAX:
       return Version::getMinimumVersion();
   }