feat: add dcr tree command to visualize dependencies

src/cli/help.rs

@@ -12,6 +12,7 @@ pub fn help() -> i32 {
     println!("    init              Initialize the current directory as a project");
     println!("    build [--profile] Build the project (default: --debug)");
     println!("    run [--profile]   Build and run the project (default: --debug)");
+    println!("    tree              Display the dependency tree");
     println!("    test              Run project tests (alias: tests)");
     println!("    clean             Remove the target directory");
     println!("    gen <subcommand>  Generate IDE integration files");

src/cli/mod.rs

@@ -10,3 +10,4 @@ pub mod new;
 pub mod run;
 pub mod setup;
 pub mod test;
+pub mod tree;

src/cli/tree.rs

@@ -0,0 +1,117 @@
+use crate::core::config::Config;
+use crate::utils::log::error;
+use crate::utils::text::{BOLD_CYAN, printc};
+use std::collections::HashSet;
+use std::path::{Path, PathBuf};
+use toml::Value;
+
+pub fn tree(_args: &[String]) -> i32 {
+    let current_dir = std::env::current_dir().unwrap_or_else(|_| PathBuf::from("."));
+    let config = match Config::open("dcr.toml") {
+        Ok(c) => c,
+        Err(_) => {
+            error("dcr.toml not found in current directory");
+            return 1;
+        }
+    };
+
+    let name = config
+        .get("package.name")
+        .and_then(|v| v.as_str())
+        .unwrap_or("unknown");
+    let version = config
+        .get("package.version")
+        .and_then(|v| v.as_str())
+        .unwrap_or("0.0.0");
+
+    printc(&format!("{} v{}", name, version), BOLD_CYAN);
+
+    let mut seen = HashSet::new();
+    seen.insert(name.to_string());
+
+    if let Some(deps) = config.get("dependencies").and_then(|v| v.as_table()) {
+        print_deps(deps, &current_dir, "", &mut seen);
+    }
+
+    0
+}
+
+fn print_deps(deps: &toml::value::Table, base_path: &Path, prefix: &str, seen: &mut HashSet<String>) {
+    let mut dep_list: Vec<_> = deps.iter().collect();
+    dep_list.sort_by_key(|(name, _)| *name);
+
+    for (i, (name, value)) in dep_list.iter().enumerate() {
+        let is_last = i == dep_list.len() - 1;
+        let connector = if is_last { "└── " } else { "├── " };
+        let child_prefix = if is_last { "    " } else { "│   " };
+
+        let dep_path = resolve_dep_path(value, base_path);
+        let mut version = String::new();
+        let mut sub_deps = None;
+        let mut resolved_path = None;
+
+        if let Some(path) = &dep_path {
+            let dcr_toml = path.join("dcr.toml");
+            if dcr_toml.exists() {
+                if let Ok(config) = Config::open(&dcr_toml.to_string_lossy()) {
+                    if let Some(v) = config.get("package.version").and_then(|v| v.as_str()) {
+                        version = format!(" v{}", v);
+                    }
+                    sub_deps = config.get("dependencies").and_then(|v| v.as_table()).cloned();
+                    resolved_path = Some(path.clone());
+                }
+            }
+        }
+
+        if version.is_empty() {
+            version = match value {
+                Value::String(s) if s.starts_with("git:") || s.starts_with("github:") => {
+                    format!(" ({})", s)
+                }
+                Value::Table(t) => {
+                    if let Some(v) = t.get("version").and_then(|v| v.as_str()) {
+                        format!(" v{}", v)
+                    } else if let Some(git) = t.get("git").and_then(|v| v.as_str()) {
+                        format!(" ({})", git)
+                    } else {
+                        "".to_string()
+                    }
+                }
+                _ => "".to_string(),
+            };
+        }
+
+        println!("{}{}{}{}", prefix, connector, name, version);
+
+        if let Some(s_deps) = sub_deps {
+            if !seen.contains(*name) {
+                seen.insert(name.to_string());
+                let new_prefix = format!("{}{}", prefix, child_prefix);
+                if let Some(path) = resolved_path {
+                    print_deps(&s_deps, &path, &new_prefix, seen);
+                }
+                seen.remove(*name);
+            }
+        }
+    }
+}
+
+fn resolve_dep_path(value: &Value, base_path: &Path) -> Option<PathBuf> {
+    match value {
+        Value::String(s) => {
+            if s.starts_with("path:") {
+                Some(base_path.join(&s[5..]))
+            } else {
+                None
+            }
+        }
+        Value::Table(t) => {
+            if let Some(path) = t.get("path").and_then(|v| v.as_str()) {
+                Some(base_path.join(path))
+            } else {
+                None
+            }
+        }
+        _ => None,
+    }
+}