added initial template outline

crates/ai/src/ai.rs

@@ -1,2 +1,3 @@
 pub mod completion;
 pub mod embedding;
+pub mod templates;

crates/ai/src/templates.rs

@@ -0,0 +1,76 @@
+use std::fmt::Write;
+
+pub struct PromptCodeSnippet {
+    path: Option<PathBuf>,
+    language_name: Option<String>,
+    content: String,
+}
+
+enum PromptFileType {
+    Text,
+    Code,
+}
+
+#[derive(Default)]
+struct PromptArguments {
+    pub language_name: Option<String>,
+    pub project_name: Option<String>,
+    pub snippets: Vec<PromptCodeSnippet>,
+}
+
+impl PromptArguments {
+    pub fn get_file_type(&self) -> PromptFileType {
+        if self
+            .language_name
+            .as_ref()
+            .and_then(|name| Some(!["Markdown", "Plain Text"].contains(&name.as_str())))
+            .unwrap_or(true)
+        {
+            PromptFileType::Code
+        } else {
+            PromptFileType::Text
+        }
+    }
+}
+
+trait PromptTemplate {
+    fn generate(args: PromptArguments) -> String;
+}
+
+struct EngineerPreamble {}
+
+impl PromptTemplate for EngineerPreamble {
+    fn generate(args: PromptArguments) -> String {
+        let mut prompt = String::new();
+
+        match args.get_file_type() {
+            PromptFileType::Code => {
+                writeln!(
+                    prompt,
+                    "You are an expert {} engineer.",
+                    args.language_name.unwrap_or("".to_string())
+                )
+                .unwrap();
+            }
+            PromptFileType::Text => {
+                writeln!(prompt, "You are an expert engineer.").unwrap();
+            }
+        }
+
+        if let Some(project_name) = args.project_name {
+            writeln!(
+                prompt,
+                "You are currently working inside the '{project_name}' in Zed the code editor."
+            )
+            .unwrap();
+        }
+
+        prompt
+    }
+}
+
+struct RepositorySnippets {}
+
+impl PromptTemplate for RepositorySnippets {
+    fn generate(args: PromptArguments) -> String {}
+}