grit: Add method for generating message translation id

reimplemented from a description of the grit id calculation

1 files changed, 33 insertions, 0 deletions

diff --git a/server/common/src/grit.rs b/server/common/src/grit.rs
index dbf4f89..a510724 100644
--- a/server/common/src/grit.rs
+++ b/server/common/src/grit.rs
@@ -1156,3 +1156,36 @@ pub async fn parse_grit_with_parts(path: impl AsRef<Path>) -> anyhow::Result<Gri
     expand_messages(&mut grit.release.messages.messages, path).await?;
     Ok(grit)
 }
+
+fn get_presentable_content(message: &Message) -> String {
+    let mut ret = String::new();
+    for c in &message.content {
+        match c {
+            TextPlaceholder::Text(value) => ret += value.as_str(),
+            TextPlaceholder::Placeholder {
+                name,
+                content: _,
+                example: _,
+            } => ret += name.as_str(),
+        }
+    }
+    ret
+}
+
+fn fingerprint(value: &str) -> i64 {
+    u64::from_be_bytes(md5::compute(value).0[0..8].try_into().unwrap()).cast_signed()
+}
+
+pub fn get_message_id(message: &Message) -> i64 {
+    let mut message_id = fingerprint(get_presentable_content(message).as_str());
+    if let Some(meaning) = &message.meaning {
+        let meaning_id = fingerprint(meaning.as_str());
+        if message_id < 0 {
+            message_id = (message_id << 1) + meaning_id + 1
+        } else {
+            message_id = (message_id << 1) + meaning_id
+        }
+    }
+    // Avoid returning negative ids
+    message_id & 0x7fffffffffffffff
+}