Feature/graphviz support

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "texforge"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2021"
 rust-version = "1.75"
 description = "Self-contained LaTeX to PDF compiler CLI"
@@ -42,6 +42,9 @@ zip = { version = "2", default-features = false, features = ["deflate"] }
 mermaid-rs-renderer = { version = "0.2", default-features = false }
 resvg = "0.46"
 
+# Graphviz/DOT diagram rendering
+layout-rs = "0.1"
+
 [dev-dependencies]
 tempfile = "3.8"
 

README.md

@@ -65,6 +65,13 @@ cargo build --release
 
 Check the [Releases](https://github.com/JheisonMB/texforge/releases) page for precompiled binaries (Linux x86_64, macOS x86_64/ARM64, Windows x86_64).
 
+### Uninstall
+
+```bash
+rm -f ~/.local/bin/texforge  # texforge binary
+rm -rf ~/.texforge/           # tectonic engine + cached templates
+```
+
 ---
 
 ## Quick Start
@@ -166,6 +173,48 @@ Templates are cached locally in `~/.texforge/templates/` after first download.
 
 ---
 
+## Diagrams
+
+`texforge build` intercepts embedded diagram environments before compilation. Originals are never modified — diagrams are rendered in `build/` copies.
+
+### Mermaid
+
+```latex
+% Default: width=\linewidth, pos=H, no caption
+\begin{mermaid}
+flowchart LR
+  A[Input] --> B[Process] --> C[Output]
+\end{mermaid}
+
+% With options
+\begin{mermaid}[width=0.6\linewidth, caption=System flow, pos=t]
+flowchart TD
+  X --> Y --> Z
+\end{mermaid}
+```
+
+### Graphviz / DOT
+
+```latex
+\begin{graphviz}[caption=Pipeline]
+digraph G {
+  rankdir=LR
+  A -> B -> C
+  B -> D
+}
+\end{graphviz}
+```
+
+Both rendered to PNG via pure Rust — no browser, no Node.js, no `dot` binary required.
+
+| Option | Default | Description |
+|---|---|---|
+| `width` | `\linewidth` | Image width |
+| `pos` | `H` | Figure placement (`H`, `t`, `b`, `h`, `p`) |
+| `caption` | _(none)_ | Figure caption |
+
+---
+
 ## Linter
 
 `texforge check` runs static analysis without compiling:
@@ -243,6 +292,9 @@ texforge fmt --check   # check without modifying (CI-friendly)
 | Archive extraction | `flate2` + `tar` |
 | File traversal | `walkdir` |
 | LaTeX engine | `tectonic` (external binary) |
+| Mermaid renderer | `mermaid-rs-renderer` |
+| Graphviz renderer | `layout-rs` |
+| SVG → PNG | `resvg` |
 
 ---
 

src/commands/init.rs

@@ -56,36 +56,34 @@ entry = "{}"
 
 /// Find the .tex file that contains \documentclass.
 fn detect_entry(root: &Path) -> Option<String> {
-    for entry in walkdir::WalkDir::new(root)
-        .max_depth(2)
-        .into_iter()
-        .filter_map(|e| e.ok())
-    {
-        let path = entry.path();
-        if path.extension().and_then(|e| e.to_str()) != Some("tex") {
-            continue;
-        }
-        if let Ok(content) = std::fs::read_to_string(path) {
-            if content.contains("\\documentclass") {
-                return path
-                    .strip_prefix(root)
-                    .ok()
-                    .map(|p| p.to_string_lossy().to_string());
-            }
-        }
-    }
-    None
+    find_file_by(root, 2, |path, _| {
+        path.extension().and_then(|e| e.to_str()) == Some("tex")
+            && std::fs::read_to_string(path)
+                .map(|c| c.contains("\\documentclass"))
+                .unwrap_or(false)
+    })
 }
 
 /// Find the first .bib file in the project.
 fn detect_bib(root: &Path) -> Option<String> {
+    find_file_by(root, 3, |path, _| {
+        path.extension().and_then(|e| e.to_str()) == Some("bib")
+    })
+}
+
+/// Walk `root` up to `max_depth` and return the first file matching `predicate`.
+fn find_file_by(
+    root: &Path,
+    max_depth: usize,
+    predicate: impl Fn(&std::path::Path, &walkdir::DirEntry) -> bool,
+) -> Option<String> {
     for entry in walkdir::WalkDir::new(root)
-        .max_depth(3)
+        .max_depth(max_depth)
         .into_iter()
         .filter_map(|e| e.ok())
     {
         let path = entry.path();
-        if path.extension().and_then(|e| e.to_str()) == Some("bib") {
+        if path.is_file() && predicate(path, &entry) {
             return path
                 .strip_prefix(root)
                 .ok()

src/compiler/mod.rs

@@ -97,34 +97,154 @@ fn parse_errors(raw: &str) -> Vec<CompileError> {
     errors
 }
 
-/// Find the tectonic binary in PATH or known locations.
+/// Find the tectonic binary in PATH or known locations, auto-installing if needed.
 fn find_tectonic() -> Result<std::path::PathBuf> {
-    // Check PATH
-    if let Ok(output) = Command::new("which").arg("tectonic").output() {
+    if let Some(path) = locate_tectonic() {
+        return Ok(path);
+    }
+    eprintln!("Tectonic not found. Installing automatically...");
+    let dest = tectonic_managed_path()?;
+    install_tectonic(&dest)?;
+    Ok(dest)
+}
+
+/// Locate tectonic in PATH or known install locations without installing.
+fn locate_tectonic() -> Option<std::path::PathBuf> {
+    // Check PATH using platform-appropriate which/where
+    #[cfg(unix)]
+    let which_cmd = "which";
+    #[cfg(not(unix))]
+    let which_cmd = "where";
+
+    if let Ok(output) = Command::new(which_cmd).arg("tectonic").output() {
         if output.status.success() {
-            let path = String::from_utf8_lossy(&output.stdout).trim().to_string();
-            return Ok(path.into());
+            let path = String::from_utf8_lossy(&output.stdout)
+                .lines()
+                .next()
+                .unwrap_or("")
+                .trim()
+                .to_string();
+            if !path.is_empty() {
+                return Some(path.into());
+            }
         }
     }
 
-    // Check known locations (including texforge-managed install)
-    for candidate in [
+    // Check known locations
+    [
         dirs::home_dir().map(|h| h.join(".texforge/bin/tectonic")),
         dirs::home_dir().map(|h| h.join(".cargo/bin/tectonic")),
         Some("/usr/local/bin/tectonic".into()),
         Some("/opt/homebrew/bin/tectonic".into()),
     ]
     .into_iter()
     .flatten()
+    .find(|p| p.exists())
+}
+
+fn tectonic_managed_path() -> Result<std::path::PathBuf> {
+    dirs::home_dir()
+        .map(|h| h.join(".texforge/bin/tectonic"))
+        .ok_or_else(|| anyhow::anyhow!("Could not determine home directory"))
+}
+
+/// Download and install tectonic to the given path.
+fn install_tectonic(dest: &std::path::Path) -> Result<()> {
+    let target = current_target()?;
+    let version = "0.15.0";
+    let (filename, is_zip) = if target.contains("windows") {
+        (format!("tectonic-{}-{}.zip", version, target), true)
+    } else {
+        (format!("tectonic-{}-{}.tar.gz", version, target), false)
+    };
+
+    let url = format!(
+        "https://github.com/tectonic-typesetting/tectonic/releases/download/tectonic%40{}/{}",
+        version, filename
+    );
+
+    eprintln!("Downloading tectonic {}...", version);
+
+    let response = reqwest::blocking::Client::new()
+        .get(&url)
+        .header("User-Agent", "texforge")
+        .send()
+        .context("Failed to download tectonic")?;
+
+    if !response.status().is_success() {
+        anyhow::bail!(
+            "Failed to download tectonic: HTTP {}\nURL: {}",
+            response.status(),
+            url
+        );
+    }
+
+    let bytes = response.bytes()?;
+
+    if let Some(parent) = dest.parent() {
+        std::fs::create_dir_all(parent)?;
+    }
+
+    if is_zip {
+        install_from_zip(&bytes, dest)?;
+    } else {
+        install_from_targz(&bytes, dest)?;
+    }
+
+    #[cfg(unix)]
     {
-        if candidate.exists() {
-            return Ok(candidate);
+        use std::os::unix::fs::PermissionsExt;
+        std::fs::set_permissions(dest, std::fs::Permissions::from_mode(0o755))?;
+    }
+
+    eprintln!("✅ Tectonic installed to {}", dest.display());
+    Ok(())
+}
+
+fn install_from_targz(bytes: &[u8], dest: &std::path::Path) -> Result<()> {
+    let decoder = flate2::read::GzDecoder::new(bytes);
+    let mut archive = tar::Archive::new(decoder);
+    for entry in archive.entries()? {
+        let mut entry = entry?;
+        let path = entry.path()?.to_string_lossy().to_string();
+        if path.ends_with("tectonic") || path == "tectonic" {
+            std::io::copy(&mut entry, &mut std::fs::File::create(dest)?)?;
+            return Ok(());
         }
     }
+    anyhow::bail!("tectonic binary not found in archive")
+}
 
-    anyhow::bail!(
-        "Tectonic not found. Install everything with:\n\
-         \n  curl -fsSL https://raw.githubusercontent.com/JheisonMB/texforge/main/install.sh | sh\n\
-         \nor install tectonic separately: cargo install tectonic"
-    );
+fn install_from_zip(bytes: &[u8], dest: &std::path::Path) -> Result<()> {
+    let cursor = std::io::Cursor::new(bytes);
+    let mut archive = zip::ZipArchive::new(cursor)?;
+    for i in 0..archive.len() {
+        let mut file = archive.by_index(i)?;
+        if file.name().ends_with("tectonic.exe") || file.name() == "tectonic.exe" {
+            std::io::copy(&mut file, &mut std::fs::File::create(dest)?)?;
+            return Ok(());
+        }
+    }
+    anyhow::bail!("tectonic.exe not found in archive")
+}
+
+fn current_target() -> Result<&'static str> {
+    #[cfg(all(target_os = "linux", target_arch = "x86_64"))]
+    return Ok("x86_64-unknown-linux-musl");
+    #[cfg(all(target_os = "linux", target_arch = "aarch64"))]
+    return Ok("aarch64-unknown-linux-musl");
+    #[cfg(all(target_os = "macos", target_arch = "x86_64"))]
+    return Ok("x86_64-apple-darwin");
+    #[cfg(all(target_os = "macos", target_arch = "aarch64"))]
+    return Ok("aarch64-apple-darwin");
+    #[cfg(all(target_os = "windows", target_arch = "x86_64"))]
+    return Ok("x86_64-pc-windows-msvc");
+    #[cfg(not(any(
+        all(target_os = "linux", target_arch = "x86_64"),
+        all(target_os = "linux", target_arch = "aarch64"),
+        all(target_os = "macos", target_arch = "x86_64"),
+        all(target_os = "macos", target_arch = "aarch64"),
+        all(target_os = "windows", target_arch = "x86_64"),
+    )))]
+    anyhow::bail!("Unsupported platform for automatic tectonic installation")
 }