feat: Add weevil uninstall command

Adds `weevil uninstall` with three modes of operation:
- Full uninstall removes the entire .weevil directory
- --dry-run enumerates managed components and their sizes
- --only N removes specific components by index

Acknowledges system-installed dependencies (Android SDK, Gradle)
in dry-run output so users know what will and won't be touched.

src/commands/mod.rs

@@ -4,4 +4,5 @@ pub mod deploy;
 pub mod sdk;
 pub mod config;
 pub mod setup;
-pub mod doctor;
+pub mod doctor;
+pub mod uninstall;

src/commands/uninstall.rs

@@ -0,0 +1,393 @@
+use anyhow::Result;
+use std::fs;
+use std::io::{self, Write};
+use std::path::PathBuf;
+use colored::*;
+
+use crate::sdk::SdkConfig;
+
+#[derive(Debug, Clone)]
+enum RemoveTarget {
+    FtcSdk(PathBuf, String),   // path, version label
+    AndroidSdk(PathBuf),
+}
+
+impl RemoveTarget {
+    fn label(&self) -> String {
+        match self {
+            RemoveTarget::FtcSdk(_, version) => format!("FTC SDK {}", version),
+            RemoveTarget::AndroidSdk(_) => "Android SDK".to_string(),
+        }
+    }
+    
+    fn path(&self) -> &PathBuf {
+        match self {
+            RemoveTarget::FtcSdk(path, _) => path,
+            RemoveTarget::AndroidSdk(path) => path,
+        }
+    }
+    
+    fn size(&self) -> u64 {
+        dir_size(self.path())
+    }
+}
+
+/// Uninstall Weevil-managed dependencies
+/// 
+/// - No args: removes ~/.weevil entirely
+/// - --dry-run: shows what would be removed
+/// - --only N [N ...]: selective removal of specific components
+pub fn uninstall_dependencies(dry_run: bool, targets: Option<Vec<usize>>) -> Result<()> {
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!("{}", "   🗑️  Weevil Uninstall - Remove Dependencies".bright_cyan().bold());
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    println!();
+    
+    let sdk_config = SdkConfig::new()?;
+    
+    // No --only flag: full uninstall, just nuke .weevil
+    if targets.is_none() {
+        return full_uninstall(&sdk_config, dry_run);
+    }
+    
+    // --only flag: selective removal
+    let all_targets = scan_targets(&sdk_config);
+    
+    if all_targets.is_empty() {
+        println!("{}", "No Weevil-managed components found.".bright_green());
+        println!();
+        return Ok(());
+    }
+    
+    // Show numbered list
+    println!("{}", "Found Weevil-managed components:".bright_yellow().bold());
+    println!();
+    for (i, target) in all_targets.iter().enumerate() {
+        println!("  {}. {} — {}", 
+            (i + 1).to_string().bright_cyan().bold(),
+            target.label(),
+            format!("{} at {}", format_size(target.size()), target.path().display()).dimmed()
+        );
+    }
+    println!();
+    
+    // Resolve selected indices
+    let indices = targets.unwrap();
+    let mut selected = Vec::new();
+    for idx in indices {
+        if idx == 0 || idx > all_targets.len() {
+            println!("{} Invalid selection: {}. Valid range is 1–{}", 
+                "✗".red(), idx, all_targets.len());
+            return Ok(());
+        }
+        selected.push(all_targets[idx - 1].clone());
+    }
+    
+    if dry_run {
+        print_dry_run(&selected);
+        return Ok(());
+    }
+    
+    print_removal_list(&selected);
+    
+    if !confirm()? {
+        return Ok(());
+    }
+    
+    execute_removal(&selected);
+    
+    Ok(())
+}
+
+/// Full uninstall — removes the entire .weevil directory
+fn full_uninstall(sdk_config: &SdkConfig, dry_run: bool) -> Result<()> {
+    if !sdk_config.cache_dir.exists() {
+        println!("{}", "No Weevil-managed components found.".bright_green());
+        println!();
+        return Ok(());
+    }
+    
+    let size = dir_size(&sdk_config.cache_dir);
+    
+    if dry_run {
+        let all_targets = scan_targets(sdk_config);
+        
+        println!("{}", "── Dry Run ─────────────────────────────────────────────────".bright_yellow().bold());
+        println!();
+        println!("{}", format!("Contents of {}:", sdk_config.cache_dir.display()).bright_yellow().bold());
+        println!();
+        for (i, target) in all_targets.iter().enumerate() {
+            println!("  {}. {} — {}", 
+                (i + 1).to_string().bright_cyan().bold(),
+                target.label(),
+                format!("{} at {}", format_size(target.size()), target.path().display()).dimmed()
+            );
+        }
+        
+        // Note any system-installed dependencies that Weevil doesn't manage
+        let mut has_external = false;
+        
+        if sdk_config.android_sdk_path.exists() 
+            && !sdk_config.android_sdk_path.to_string_lossy().contains(".weevil") {
+            if !has_external {
+                println!();
+                has_external = true;
+            }
+            println!("  {} Android SDK at {} — not managed by Weevil, will not be removed", 
+                "ⓘ".bright_cyan(),
+                sdk_config.android_sdk_path.display()
+            );
+        }
+        
+        if let Ok(gradle_version) = check_gradle() {
+            if !has_external {
+                println!();
+            }
+            println!("  {} Gradle {} — not managed by Weevil, will not be removed", 
+                "ⓘ".bright_cyan(),
+                gradle_version
+            );
+        }
+        
+        println!();
+        println!("{}", format!("Total: {} ({})", sdk_config.cache_dir.display(), format_size(size)).bright_yellow().bold());
+        println!();
+        println!("{}", "To remove everything:".bright_yellow().bold());
+        println!("  {}", "weevil uninstall".bright_cyan());
+        println!();
+        println!("{}", "To remove specific items:".bright_yellow().bold());
+        println!("  {}", "weevil uninstall --only 1 2".bright_cyan());
+        println!();
+        return Ok(());
+    }
+    
+    println!("{}", "This will permanently remove:".bright_yellow().bold());
+    println!();
+    println!("  {} {}  ({})", "✗".red(), sdk_config.cache_dir.display(), format_size(size));
+    println!();
+    println!("{}", "Everything Weevil installed will be gone.".bright_yellow());
+    println!();
+    
+    if !confirm()? {
+        return Ok(());
+    }
+    
+    println!();
+    print!("  Removing {} ... ", sdk_config.cache_dir.display());
+    match fs::remove_dir_all(&sdk_config.cache_dir) {
+        Ok(_) => {
+            println!("{}", "✓".green());
+            println!();
+            println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+            println!("{}", "   ✓ Uninstall Complete".bright_green().bold());
+            println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+            println!();
+            println!("{}", "Weevil binary is still installed. To remove it, delete the weevil executable.".bright_yellow());
+            println!();
+            println!("{}", "To reinstall dependencies later:".bright_yellow().bold());
+            println!("  {}", "weevil setup".bright_cyan());
+        }
+        Err(e) => {
+            println!("{} ({})", "✗".red(), e);
+            println!();
+            println!("{}", "You may need to manually remove this directory.".bright_yellow());
+        }
+    }
+    
+    println!();
+    Ok(())
+}
+
+fn print_dry_run(selected: &[RemoveTarget]) {
+    println!("{}", "── Dry Run ─────────────────────────────────────────────────".bright_yellow().bold());
+    println!();
+    println!("{}", "The following would be removed:".bright_yellow());
+    println!();
+    let mut total: u64 = 0;
+    for target in selected {
+        let size = target.size();
+        total += size;
+        println!("  {} {}  ({})", "✗".red(), target.label(), format_size(size));
+        println!("    {}", target.path().display().to_string().dimmed());
+    }
+    println!();
+    println!("{}", format!("Total: {}", format_size(total)).bright_yellow().bold());
+    println!();
+    println!("{}", "Run without --dry-run to actually remove these components.".dimmed());
+    println!();
+}
+
+fn print_removal_list(selected: &[RemoveTarget]) {
+    println!("{}", "The following will be removed:".bright_yellow().bold());
+    println!();
+    let mut total: u64 = 0;
+    for target in selected {
+        let size = target.size();
+        total += size;
+        println!("  {} {}  ({})", "✗".red(), target.label(), format_size(size));
+        println!("    {}", target.path().display().to_string().dimmed());
+    }
+    println!();
+    println!("{}", format!("Total: {}", format_size(total)).bright_yellow().bold());
+    println!();
+}
+
+fn confirm() -> Result<bool> {
+    print!("{}", "Are you sure you want to continue? (y/N): ".bright_yellow());
+    io::stdout().flush()?;
+    
+    let mut input = String::new();
+    io::stdin().read_line(&mut input)?;
+    let answer = input.trim().to_lowercase();
+    
+    if answer != "y" && answer != "yes" {
+        println!();
+        println!("{}", "Uninstall cancelled.".bright_green());
+        println!();
+        return Ok(false);
+    }
+    
+    Ok(true)
+}
+
+fn execute_removal(selected: &[RemoveTarget]) {
+    println!();
+    println!("{}", "Removing components...".bright_yellow());
+    println!();
+    
+    let mut removed = Vec::new();
+    let mut failed = Vec::new();
+    
+    for target in selected {
+        print!("  Removing {}... ", target.label());
+        match fs::remove_dir_all(target.path()) {
+            Ok(_) => {
+                println!("{}", "✓".green());
+                removed.push(target.clone());
+            }
+            Err(e) => {
+                println!("{} ({})", "✗".red(), e);
+                failed.push((target.clone(), e.to_string()));
+            }
+        }
+    }
+    
+    println!();
+    println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+    
+    if failed.is_empty() {
+        println!("{}", "   ✓ Uninstall Complete".bright_green().bold());
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+        println!();
+        println!("{}", "Removed:".bright_green().bold());
+        for target in &removed {
+            println!("  {} {}", "✓".green(), target.label());
+        }
+    } else {
+        println!("{}", "   ⚠ Uninstall Completed with Errors".bright_yellow().bold());
+        println!("{}", "═══════════════════════════════════════════════════════════".bright_cyan());
+        println!();
+        if !removed.is_empty() {
+            println!("{}", "Removed:".bright_green().bold());
+            for target in &removed {
+                println!("  {} {}", "✓".green(), target.label());
+            }
+            println!();
+        }
+        println!("{}", "Failed to remove:".bright_red().bold());
+        for (target, error) in &failed {
+            println!("  {} {}: {}", "✗".red(), target.label(), error);
+        }
+        println!();
+        println!("{}", "You may need to manually remove these directories.".bright_yellow());
+    }
+    
+    println!();
+    println!("{}", "To reinstall dependencies later:".bright_yellow().bold());
+    println!("  {}", "weevil setup".bright_cyan());
+    println!();
+}
+
+/// Scan the cache directory for individual removable components (used by --only)
+fn scan_targets(sdk_config: &SdkConfig) -> Vec<RemoveTarget> {
+    let mut targets = Vec::new();
+    
+    if sdk_config.cache_dir.exists() {
+        if let Ok(entries) = fs::read_dir(&sdk_config.cache_dir) {
+            for entry in entries.flatten() {
+                let name = entry.file_name().to_string_lossy().to_string();
+                let path = entry.path();
+                
+                if !path.is_dir() {
+                    continue;
+                }
+                
+                if name.starts_with("ftc-sdk") {
+                    let version = crate::sdk::ftc::get_version(&path)
+                        .unwrap_or_else(|_| {
+                            if name == "ftc-sdk" {
+                                "default".to_string()
+                            } else {
+                                name.trim_start_matches("ftc-sdk-").to_string()
+                            }
+                        });
+                    targets.push(RemoveTarget::FtcSdk(path, version));
+                }
+            }
+        }
+    }
+    
+    // Android SDK — only if Weevil installed it (lives inside .weevil)
+    if sdk_config.android_sdk_path.exists() 
+        && sdk_config.android_sdk_path.to_string_lossy().contains(".weevil") {
+        targets.push(RemoveTarget::AndroidSdk(sdk_config.android_sdk_path.clone()));
+    }
+    
+    targets
+}
+
+fn check_gradle() -> Result<String> {
+    let output = std::process::Command::new("gradle")
+        .arg("--version")
+        .output();
+    
+    match output {
+        Ok(out) => {
+            let stdout = String::from_utf8_lossy(&out.stdout);
+            for line in stdout.lines() {
+                if line.starts_with("Gradle") {
+                    return Ok(line.replace("Gradle ", ""));
+                }
+            }
+            Ok("installed (version unknown)".to_string())
+        }
+        Err(_) => anyhow::bail!("Gradle not found"),
+    }
+}
+
+fn dir_size(path: &PathBuf) -> u64 {
+    let mut size: u64 = 0;
+    if let Ok(entries) = fs::read_dir(path) {
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if path.is_dir() {
+                size += dir_size(&path);
+            } else if let Ok(metadata) = path.metadata() {
+                size += metadata.len();
+            }
+        }
+    }
+    size
+}
+
+fn format_size(bytes: u64) -> String {
+    if bytes >= 1_073_741_824 {
+        format!("{:.1} GB", bytes as f64 / 1_073_741_824.0)
+    } else if bytes >= 1_048_576 {
+        format!("{:.1} MB", bytes as f64 / 1_048_576.0)
+    } else if bytes >= 1_024 {
+        format!("{:.1} KB", bytes as f64 / 1_024.0)
+    } else {
+        format!("{} B", bytes)
+    }
+}

src/main.rs

@@ -42,6 +42,17 @@ enum Commands {
         path: Option<String>,
     },
     
+    /// Remove Weevil-installed SDKs and dependencies
+    Uninstall {
+        /// Show what would be removed without actually removing anything
+        #[arg(long)]
+        dry_run: bool,
+        
+        /// Remove only specific items by number (use --dry-run first to see the list)
+        #[arg(long, value_name = "NUM", num_args = 1..)]
+        only: Option<Vec<usize>>,
+    },
+    
     /// Upgrade an existing project to the latest generator version
     Upgrade {
         /// Path to the project directory
@@ -114,6 +125,9 @@ fn main() -> Result<()> {
         Commands::Setup { path } => {
             commands::setup::setup_environment(path.as_deref())
         }
+        Commands::Uninstall { dry_run, only } => {
+            commands::uninstall::uninstall_dependencies(dry_run, only)
+        }
         Commands::Upgrade { path } => {
             commands::upgrade::upgrade_project(&path)
         }