From faf1f49d50494ca0929049c1b6fb8cb907a7cec0 Mon Sep 17 00:00:00 2001
From: Senstella <senstella01@gmail.com>
Date: Tue, 7 Oct 2025 22:46:07 +0900
Subject: [PATCH] init

---
 .gitignore     |    1 +
 Cargo.lock     | 1334 ++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |   14 +
 src/fossil.rs  |   75 +++
 src/main.rs    |   12 +
 src/matcher.rs |  105 ++++
 src/mcp.rs     |  204 ++++++++
 7 files changed, 1745 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/fossil.rs
 create mode 100644 src/main.rs
 create mode 100644 src/matcher.rs
 create mode 100644 src/mcp.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..0fa17f8
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1334 @@
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+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
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+ "zerocopy-derive",
+]
+
+[[package]]
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..01dd1d1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "fossil"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.100"
+gpui = "0.1.0"
+imara-diff = "0.2.0"
+nucleo-matcher = "0.3.1"
+rmcp = { version = "0.8.0", features = ["server", "macros", "transport-sse-server", "transport-io", "transport-streamable-http-server", "elicitation", "schemars"] }
+serde = "1.0.228"
+serde_json = "1.0.145"
+tokio = { version = "1.47.1", features = ["rt-multi-thread", "macros"] }
diff --git a/src/fossil.rs b/src/fossil.rs
new file mode 100644
index 0000000..6700709
--- /dev/null
+++ b/src/fossil.rs
@@ -0,0 +1,75 @@
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
+
+use imara_diff::{Algorithm, BasicLineDiffPrinter, Diff, InternedInput, UnifiedDiffConfig};
+
+fn get_diff(old: &str, new: &str) -> String {
+    let input = InternedInput::new(old, new);
+    let mut diff = Diff::compute(Algorithm::Histogram, &input);
+    diff.postprocess_lines(&input);
+
+    diff.unified_diff(
+        &BasicLineDiffPrinter(&input.interner),
+        UnifiedDiffConfig::default(),
+        &input,
+    )
+    .to_string()
+}
+
+#[derive(Debug, Default)]
+pub struct Fossil {
+    pub versions: Vec<String>,
+}
+
+impl Fossil {
+    pub fn new(initial_content: String) -> Self {
+        Self {
+            versions: vec![initial_content],
+        }
+    }
+
+    pub fn history(&self) -> &Vec<String> {
+        &self.versions
+    }
+
+    pub fn latest(&self) -> Option<&String> {
+        self.versions.last()
+    }
+
+    pub fn commit(&mut self, new_content: String) -> String {
+        let empty = String::new();
+        let diff = get_diff(self.latest().unwrap_or_else(|| &empty), &new_content);
+
+        self.versions.push(new_content);
+
+        diff
+    }
+
+    pub fn revert(&mut self, steps: u32) -> Result<String, String> {
+        let steps = steps as usize;
+        if steps == 0 || self.versions.len() <= steps {
+            return Err("Steps are bigger than the maximum version".into());
+        }
+        let new_len = self.versions.len() - steps;
+
+        let empty = String::new();
+        let old = self.latest().unwrap_or_else(|| &empty).clone();
+
+        self.versions.truncate(new_len);
+
+        let diff = get_diff(&old, self.latest().unwrap_or_else(|| &empty));
+
+        Ok(diff)
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct FossilManager {
+    pub fossils: Arc<Mutex<HashMap<String, Fossil>>>,
+}
+
+impl FossilManager {
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e069477
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,12 @@
+use crate::mcp::FossilEditor;
+use rmcp::{ServiceExt, transport::stdio};
+
+mod fossil;
+mod matcher;
+mod mcp;
+
+#[tokio::main]
+async fn main() {
+    let editor = FossilEditor::new();
+    let _ = editor.serve(stdio()).await;
+}
diff --git a/src/matcher.rs b/src/matcher.rs
new file mode 100644
index 0000000..57e0c7e
--- /dev/null
+++ b/src/matcher.rs
@@ -0,0 +1,105 @@
+use nucleo_matcher::{
+    Config, Matcher,
+    pattern::{AtomKind, CaseMatching, Normalization, Pattern},
+};
+use std::sync::{Mutex, OnceLock};
+
+static MATCHER: OnceLock<Mutex<Matcher>> = OnceLock::new();
+
+pub fn match_lines(code: &str, start: &str, end: &str) -> Option<(usize, usize)> {
+    let mut matcher = MATCHER
+        .get_or_init(|| Mutex::new(Matcher::new(Config::DEFAULT)))
+        .lock()
+        .ok()?;
+
+    let lines: Vec<&str> = code.lines().collect();
+    let n = lines.len();
+
+    let start_parts: Vec<&str> = start.split('\n').collect();
+    let end_parts: Vec<&str> = end.split('\n').collect();
+
+    let start_len = start_parts.len();
+    let end_len = end_parts.len();
+
+    if start_len == 0 || end_len == 0 || n == 0 {
+        return None;
+    }
+
+    let non_empty: Vec<bool> = lines.iter().map(|line| !line.trim().is_empty()).collect();
+    let nei: Vec<usize> = (0..n).filter(|&i| non_empty[i]).collect();
+    let m = nei.len();
+
+    if m < start_len || m < end_len {
+        return None;
+    }
+
+    let start_patterns: Vec<Pattern> = start_parts
+        .iter()
+        .map(|&part| {
+            Pattern::new(
+                part,
+                CaseMatching::Ignore,
+                Normalization::Smart,
+                AtomKind::Fuzzy,
+            )
+        })
+        .collect();
+
+    let end_patterns: Vec<Pattern> = end_parts
+        .iter()
+        .map(|&part| {
+            Pattern::new(
+                part,
+                CaseMatching::Ignore,
+                Normalization::Smart,
+                AtomKind::Fuzzy,
+            )
+        })
+        .collect();
+
+    let mut start_candidates: Vec<(usize, usize)> = vec![];
+
+    for p in 0..=m - start_len {
+        let matches_all = (0..start_len).all(|k| {
+            let line = lines[nei[p + k]];
+            !start_patterns[k]
+                .match_list(std::iter::once(line), &mut matcher)
+                .is_empty()
+        });
+        if matches_all {
+            start_candidates.push((nei[p], nei[p + start_len - 1]));
+        }
+    }
+
+    let mut end_candidates: Vec<(usize, usize)> = vec![];
+
+    for p in 0..=m - end_len {
+        let matches_all = (0..end_len).all(|k| {
+            let line = lines[nei[p + k]];
+            !end_patterns[k]
+                .match_list(std::iter::once(line), &mut matcher)
+                .is_empty()
+        });
+        if matches_all {
+            end_candidates.push((nei[p], nei[p + end_len - 1]));
+        }
+    }
+
+    let mut result = None;
+
+    for &(s_start, s_end) in &start_candidates {
+        let pos = end_candidates.partition_point(|&(e_start, _)| e_start <= s_end);
+
+        if end_candidates[pos..].len() == 1 {
+            let (_, e_end) = end_candidates[pos];
+            if result.is_some() {
+                return None;
+            }
+            result = Some((s_start, e_end));
+        } else {
+            return None;
+        }
+    }
+
+    result
+}
diff --git a/src/mcp.rs b/src/mcp.rs
new file mode 100644
index 0000000..d8044e2
--- /dev/null
+++ b/src/mcp.rs
@@ -0,0 +1,204 @@
+use crate::fossil::{Fossil, FossilManager};
+use crate::matcher::match_lines;
+use rmcp::{
+    ServerHandler,
+    handler::server::{
+        router::tool::ToolRouter,
+        wrapper::{Json, Parameters},
+    },
+    model::{ServerCapabilities, ServerInfo},
+    schemars, tool, tool_handler, tool_router,
+};
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct CreateFossilRequest {
+    #[schemars(description = "A unique identifier for the fossil, e.g., 'cute-hamburger-01.py'.")]
+    pub id: String,
+    #[schemars(description = "The initial content of the fossil.")]
+    pub content: String,
+}
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct FossilIdRequest {
+    #[schemars(description = "The unique identifier for the fossil.")]
+    pub id: String,
+}
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct FuzzyEditRequest {
+    #[schemars(description = "The unique identifier for the fossil to edit.")]
+    pub id: String,
+    #[schemars(description = "The start of the code to replace.")]
+    pub start_pattern: String,
+    #[schemars(description = "The end of the code to replace.")]
+    pub end_pattern: String,
+    #[schemars(
+        description = "The new code that will replace the matched section. An empty string performs a deletion."
+    )]
+    pub replacement: String,
+}
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct RevertRequest {
+    #[schemars(description = "The unique identifier for the fossil to revert.")]
+    pub id: String,
+    #[schemars(description = "The number of edits to undo. Defaults to 1.")]
+    pub steps: Option<u32>,
+}
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct GetVersionRequest {
+    #[schemars(description = "The unique identifier for the fossil.")]
+    pub id: String,
+    #[schemars(
+        description = "The version index. 0 is the initial version, positive indices count forward from the start, negative indices count backward from the latest (-1 for latest, -2 for previous, etc.). Defaults to -1 (latest)."
+    )]
+    pub version: Option<i32>,
+}
+
+#[derive(Debug, Clone)]
+pub struct FossilEditor {
+    tool_router: ToolRouter<Self>,
+    state: FossilManager,
+}
+
+#[tool_router]
+impl FossilEditor {
+    pub fn new() -> Self {
+        Self {
+            tool_router: Self::tool_router(),
+            state: FossilManager::new(),
+        }
+    }
+
+    #[tool(description = "Creates a new code fossil in memory with initial content.")]
+    fn create_fossil(&self, Parameters(req): Parameters<CreateFossilRequest>) -> String {
+        let mut fossils = self.state.fossils.lock().unwrap();
+        if fossils.contains_key(&req.id) {
+            return format!("Error: Fossil with id '{}' already exists.", req.id);
+        }
+        fossils.insert(req.id.clone(), Fossil::new(req.content));
+        format!("Successfully created fossil '{}'.", req.id)
+    }
+
+    #[tool(description = "Lists the IDs of all currently managed fossils.")]
+    fn list_fossils(&self) -> Json<Vec<String>> {
+        let fossils = self.state.fossils.lock().unwrap();
+        Json(fossils.keys().cloned().collect())
+    }
+
+    #[tool(
+        description = "Retrieves a specific version of a fossil. Use this to preview past versions without reverting."
+    )]
+    fn get_version(
+        &self,
+        Parameters(req): Parameters<GetVersionRequest>,
+    ) -> Result<String, String> {
+        let fossils = self.state.fossils.lock().unwrap();
+        let fossil = fossils
+            .get(&req.id)
+            .ok_or(format!("Error: Fossil '{}' not found.", req.id))?;
+        let history = fossil.history();
+        let len = history.len() as i32;
+        if len == 0 {
+            return Err("Error: Fossil has no history.".to_string());
+        }
+        let mut idx = req.version.unwrap_or(-1);
+        if idx < 0 {
+            idx += len;
+        }
+        if idx < 0 || idx >= len {
+            return Err(format!(
+                "Error: Invalid version index {} for history of length {}.",
+                req.version.unwrap_or(-1),
+                len
+            ));
+        }
+        Ok(history[idx as usize].clone())
+    }
+
+    #[tool(
+        description = "Replaces a section of code in an fossil using fuzzy matching. Providing an empty string for `replacement` deletes the section. Optional flags for more flexible matching."
+    )]
+    fn fuzzy_edit(&self, Parameters(req): Parameters<FuzzyEditRequest>) -> Result<String, String> {
+        let mut fossils = self.state.fossils.lock().unwrap();
+        let fossil = fossils
+            .get_mut(&req.id)
+            .ok_or_else(|| format!("Error: Fossil '{}' not found.", req.id))?;
+
+        let current_code = fossil.latest().ok_or("Error: Fossil is empty.")?.clone();
+
+        let (start_line, end_line) =
+            match_lines(&current_code, &req.start_pattern, &req.end_pattern)
+                .ok_or("Error: Fuzzy match failed. More than one pattern match detected. Please make start/end a bit longer and more specific?")?;
+
+        let lines: Vec<&str> = current_code.lines().collect();
+        let mut new_code_lines = Vec::new();
+
+        new_code_lines.extend_from_slice(&lines[..start_line - 1]);
+        new_code_lines.push(&req.replacement);
+        new_code_lines.extend_from_slice(&lines[end_line..]);
+
+        let new_code = new_code_lines.join("\n");
+        let diff = fossil.commit(new_code.clone());
+
+        Ok(format!(
+            "Successfully edited fossil '{}'\n```diff\n{}\n```.\n\n",
+            req.id, diff
+        ))
+    }
+
+    #[tool(description = "Reverts an fossil to a previous version (undo).")]
+    fn revert(&self, Parameters(req): Parameters<RevertRequest>) -> Result<String, String> {
+        let mut fossils = self.state.fossils.lock().unwrap();
+        let fossil = fossils
+            .get_mut(&req.id)
+            .ok_or_else(|| format!("Error: Fossil '{}' not found.", req.id))?;
+
+        if let Ok(diff) = fossil.revert(req.steps.unwrap_or(1)) {
+            Ok(format!(
+                "Successfully reverted fossil '{}\n```diff\n{}\n```'.",
+                req.id, diff
+            ))
+        } else {
+            Err(format!(
+                "Error: Could not revert fossil '{}'. Not enough history.",
+                req.id
+            ))
+        }
+    }
+
+    #[tool(description = "Deletes a fossil by its ID.")]
+    fn delete_fossil(&self, Parameters(req): Parameters<FossilIdRequest>) -> String {
+        let mut fossils = self.state.fossils.lock().unwrap();
+        if fossils.remove(&req.id).is_some() {
+            format!("Successfully deleted fossil '{}'.", req.id)
+        } else {
+            format!("Error: Fossil '{}' not found.", req.id)
+        }
+    }
+}
+
+#[tool_handler]
+impl ServerHandler for FossilEditor {
+    fn get_info(&self) -> ServerInfo {
+        ServerInfo {
+            instructions: Some(
+                r#"Artifact but you don't have to rewrite the entire code/poem/letter to edit things iteratively. This toolset allows you to manage versioned text artifacts (called "fossils") in memory, with flexible editing capabilities designed for iterative refinement. Think of each fossil as a living document you can create, read, modify, and undo changes on without starting over. Handles edge cases like empty fossils gracefully (e.g., errors on edit/get if empty), and content can be large enough.
+
+                - Use `create_fossil` to start a new fossil with initial content. Provide a unique ID (like a filename) and the starting text.
+                - Use `list_fossils` to see a list of all current fossil IDs.
+                - Use `get_version` to retrieve a specific version of the fossil by its ID and version index (0 for initial, -1 for latest, etc.). Use this to preview history or past states without reverting.
+                - Use `fuzzy_edit` as your main tool for making changes. This lets you target and replace (or delete) sections of the content using flexible pattern matching:
+                  - `start_pattern`: A string that identifies the beginning of the section you want to edit. It can be a partial line, a substring, or even a few words— the matching is fuzzy and tolerant of minor variations like extra whitespace, comments, or small typos, as long as it's unique in the document.
+                  - `end_pattern`: A string that identifies the end of the section (exclusive). Similar to start_pattern, it can be partial and fuzzy.
+                  - `replacement`: The new text to insert in place of the matched section. Use an empty string ("") to delete the section entirely.
+                  - Flexibility: The fuzzy matching is designed to be robust and LLM-friendly—it searches for the best unique match without requiring exact full-line copies. If the document has only one reasonable match for your patterns, it will find it even if the patterns are short or approximate. If there's ambiguity (e.g., multiple possible matches), it will error out and suggest making patterns longer/more specific. This means you can confidently use descriptive snippets like "def my_function(" for start and ")" for end in code, or "Dear [Name]," for start and "Best regards," for end in a letter. For insertions, set start_pattern and end_pattern to point to the same spot (e.g., both matching the line before/after where you want to insert). For appends, use an end_pattern that matches beyond the current end or leave it minimal if the tool supports it. Experiment iteratively— if a match fails, just refine the patterns based on the error.
+                - Use `revert` to undo recent edits on a fossil. Specify `steps` to undo multiple (defaults to 1). This rolls back to previous versions without losing history. Preview with `get_version` first if needed.
+                - Use `delete_fossil` to clean up and remove unused fossils by ID."#.into(),
+            ),
+            capabilities: ServerCapabilities::builder().enable_tools().build(),
+            ..Default::default()
+        }
+    }
+}