add vhdl hover

src/hover/vhdl.rs

@@ -1,9 +1,46 @@
+use std::{path::PathBuf, str::FromStr};
+
+use log::info;
 use tower_lsp::lsp_types::*;
 use crate::server::LSPServer;
 
-pub fn hover_vhdl(server: &LSPServer, param: &DocumentSymbolParams) -> Option<Hover> {
-    let design_file = server.srcs.design_file_map.write().unwrap();
-    
-    
-    None
+use super::{from_lsp_pos, to_escape_path};
+
+pub fn hover_vhdl(server: &LSPServer, params: &TextDocumentPositionParams) -> Option<Hover> {
+    let uri = &params.text_document.uri;
+    let file_id = server.srcs.get_id(&uri).to_owned();
+    server.srcs.wait_parse_ready(file_id, false);
+    let projects = server.srcs.design_file_map.read().ok()?;
+
+    let path = match PathBuf::from_str(uri.path()) {
+        Ok(path) => path,
+        Err(error) => {
+            info!("error happen in <goto_include_definition>: {:?}", error);
+            return None;
+        }
+    };
+    let escape_path = to_escape_path(&path);
+    let escape_path_string = escape_path.to_str().unwrap_or("");
+    if escape_path_string.len() == 0 {
+        info!("error happen in [vhdl_parser_pipeline], escape_path_string is empty");
+        return None;
+    }
+    let project = match projects.get(escape_path_string) {
+        Some(project) => project,
+        None => return None
+    };
+
+    let source = project.get_source(&escape_path)?;
+
+    let ent = project.find_declaration(&source, from_lsp_pos(params.position))?;
+
+    let value = project.format_declaration(ent)?;
+
+    Some(Hover {
+        contents: HoverContents::Markup(MarkupContent {
+            kind: MarkupKind::Markdown,
+            value: format!("```vhdl\n{value}\n```"),
+        }),
+        range: None,
+    })
 }