feat!: rename implicit "mainnet" network to "ic" and define implicit "ic" environment

.claude/CLAUDE.md

@@ -109,11 +109,18 @@ Two network types in `crates/icp/src/network/`:
 
 The network launcher is automatically downloaded on first use. For development/debugging, you can override with `ICP_CLI_NETWORK_LAUNCHER_PATH`.
 
-##### Network Overrides
+##### Implicit Networks and Environments
 
-- Users can override the "local" network definition in their `icp.yaml` to customize the local development environment
-- The "mainnet" network is protected and cannot be overridden to prevent production deployment accidents
-- If no "local" network is defined, a default managed network on `localhost:8000` is automatically added
+The CLI provides two implicit networks and environments that are always available:
+
+- **`local` network**: A default managed network on `localhost:8000`. Users can override this in their `icp.yaml` to customize the local development environment (e.g., different port or connecting to an existing network).
+- **`ic` network**: The IC mainnet at `https://icp-api.io`. This network is **protected** and cannot be overridden to prevent accidental production deployment with incorrect settings.
+
+Corresponding implicit environments are also provided:
+- **`local` environment**: Uses the `local` network with all project canisters. This is the default environment when none is specified.
+- **`ic` environment**: Uses the `ic` network with all project canisters.
+
+These constants are defined in `crates/icp/src/prelude.rs` as `LOCAL` and `IC` and are used throughout the codebase.
 
 #### Identity & Canister IDs
 

CHANGELOG.md

@@ -3,6 +3,9 @@
 * feat: Show `name` in `canister status` command
 * feat: `icp canister metadata <canister> <metadata section>` now fetches metadata sections from specified canisters
 * fix: Validate explicit canister paths and throw an error if `canister.yaml` is not found
+* feat!: Rename the implicit "mainnet" network to "ic"
+  * The corresponding environment "ic" is defined implicitly which can be overwritten by user configuration
+  * The `--mainnet` and `--ic` flags are removed. Use `-n/--network ic`, `-e/--environment ic` instead.
 
 # v0.1.0-beta.3
 

crates/icp-cli/src/commands/network/args.rs

@@ -1,5 +1,5 @@
 use clap::Args;
-use icp::{context::NetworkOrEnvironmentSelection, project::DEFAULT_LOCAL_NETWORK_NAME};
+use icp::{context::NetworkOrEnvironmentSelection, prelude::LOCAL};
 
 #[derive(Args, Clone, Debug)]
 pub(crate) struct NetworkOrEnvironmentArgs {
@@ -51,8 +51,6 @@ impl From<NetworkOrEnvironmentArgs> for Result<NetworkOrEnvironmentSelection, an
         }
 
         // Precedence 4: Default to "local" network (lowest)
-        Ok(NetworkOrEnvironmentSelection::Network(
-            DEFAULT_LOCAL_NETWORK_NAME.to_string(),
-        ))
+        Ok(NetworkOrEnvironmentSelection::Network(LOCAL.to_string()))
     }
 }

crates/icp-cli/src/options.rs

@@ -1,9 +1,7 @@
 use clap::{ArgGroup, Args};
 use icp::context::{EnvironmentSelection, NetworkSelection};
 use icp::identity::IdentitySelection;
-use icp::project::{
-    DEFAULT_LOCAL_ENVIRONMENT_NAME, DEFAULT_MAINNET_ENVIRONMENT_NAME, DEFAULT_MAINNET_NETWORK_NAME,
-};
+use icp::prelude::LOCAL;
 use url::Url;
 
 mod heading {
@@ -47,38 +45,17 @@ pub(crate) struct EnvironmentOpt {
         help_heading = heading::NETWORK_PARAMETERS,
     )]
     environment: Option<String>,
-
-    /// Shorthand for --environment=ic.
-    #[arg(
-        long,
-        global(true),
-        group = "environment-select",
-        group = "network-select",
-        help_heading = heading::NETWORK_PARAMETERS,
-    )]
-    ic: bool,
 }
 
 impl EnvironmentOpt {
     #[allow(dead_code)]
     pub(crate) fn name(&self) -> &str {
-        // Support --ic
-        if self.ic {
-            return DEFAULT_MAINNET_ENVIRONMENT_NAME;
-        }
-
-        // Otherwise, default to `local`
-        self.environment
-            .as_deref()
-            .unwrap_or(DEFAULT_LOCAL_ENVIRONMENT_NAME)
+        self.environment.as_deref().unwrap_or(LOCAL)
     }
 }
 
 impl From<EnvironmentOpt> for EnvironmentSelection {
     fn from(v: EnvironmentOpt) -> Self {
-        if v.ic {
-            return EnvironmentSelection::Named(DEFAULT_MAINNET_ENVIRONMENT_NAME.to_string());
-        }
         match v.environment {
             Some(name) => EnvironmentSelection::Named(name),
             None => EnvironmentSelection::Default,
@@ -90,19 +67,12 @@ impl From<EnvironmentOpt> for EnvironmentSelection {
 #[clap(group(ArgGroup::new("network-select").multiple(false)))]
 pub(crate) struct NetworkOpt {
     /// Name of the network to target, conflicts with environment argument
-    #[arg(long, env = "ICP_NETWORK", group = "network-select", help_heading = heading::NETWORK_PARAMETERS)]
+    #[arg(long, short = 'n', env = "ICP_NETWORK", group = "network-select", help_heading = heading::NETWORK_PARAMETERS)]
     network: Option<String>,
-
-    /// Shorthand for --network=mainnet
-    #[arg(long, group = "network-select", help_heading = heading::NETWORK_PARAMETERS)]
-    mainnet: bool,
 }
 
 impl From<NetworkOpt> for NetworkSelection {
     fn from(v: NetworkOpt) -> Self {
-        if v.mainnet {
-            return NetworkSelection::Named(DEFAULT_MAINNET_NETWORK_NAME.to_string());
-        }
         match v.network {
             Some(network) => match Url::parse(&network) {
                 Ok(url) => NetworkSelection::Url(url),

crates/icp-cli/tests/common/clients/icp_cli.rs

@@ -1,5 +1,5 @@
 use candid::Principal;
-use icp::{prelude::*, project::DEFAULT_LOCAL_ENVIRONMENT_NAME};
+use icp::prelude::*;
 
 use crate::common::TestContext;
 
@@ -18,7 +18,7 @@ impl<'a> Client<'a> {
         Self {
             ctx,
             current_dir,
-            environment: environment.unwrap_or(DEFAULT_LOCAL_ENVIRONMENT_NAME.to_string()),
+            environment: environment.unwrap_or(LOCAL.to_string()),
         }
     }
 

crates/icp-cli/tests/cycles_tests.rs

@@ -147,7 +147,7 @@ async fn cycles_mint_with_explicit_network() {
 }
 
 #[tokio::test]
-async fn cycles_mint_with_mainnet() {
+async fn cycles_mint_on_ic() {
     let ctx = TestContext::new();
 
     // Setup project
@@ -156,10 +156,10 @@ async fn cycles_mint_with_mainnet() {
     // Create identity
     clients::icp(&ctx, &project_dir, None).use_new_random_identity();
 
-    // Run mint command with explicit --mainnet flag
+    // Run mint command with --network ic
     ctx.icp()
         .current_dir(&project_dir)
-        .args(["cycles", "mint", "--icp", "1", "--mainnet"])
+        .args(["cycles", "mint", "--icp", "1", "--network", "ic"])
         .assert()
         .stderr(contains(
             "Error: Insufficient funds: 1.00010000 ICP required, 0 ICP available.",

crates/icp-cli/tests/network_tests.rs

@@ -515,18 +515,18 @@ async fn override_local_network_with_custom_port() {
 }
 
 #[tokio::test]
-async fn cannot_override_mainnet() {
+async fn cannot_override_ic() {
     let ctx = TestContext::new();
-    let project_dir = ctx.create_project_dir("override-mainnet");
+    let project_dir = ctx.create_project_dir("override-ic");
 
-    // Attempt to override mainnet
+    // Attempt to override ic
     write_string(
         &project_dir.join("icp.yaml"),
         indoc! {r#"
             networks:
-              - name: mainnet
+              - name: ic
                 mode: connected
-                url: http://fake-mainnet.local
+                url: http://fake-ic.local
         "#},
     )
     .expect("failed to write project manifest");
@@ -537,7 +537,7 @@ async fn cannot_override_mainnet() {
         .args(["build"])
         .assert()
         .failure()
-        .stderr(contains("`mainnet` is a reserved network name"));
+        .stderr(contains("`ic` is a reserved network name"));
 }
 
 #[tokio::test]

crates/icp-cli/tests/project_tests.rs

@@ -267,7 +267,7 @@ fn explicit_path_with_subdirectory() {
 }
 
 #[test]
-fn redefine_mainnet_network_disallowed() {
+fn redefine_ic_network_disallowed() {
     let ctx = TestContext::new();
 
     // Setup project
@@ -277,9 +277,9 @@ fn redefine_mainnet_network_disallowed() {
         &project_dir.join("icp.yaml"),
         r#"
         networks:
-          - name: mainnet
+          - name: ic
             mode: connected
-            url: https://fake-mainnet.io
+            url: https://fake-ic.io
         "#,
     )
     .expect("failed to write project manifest");
@@ -290,5 +290,5 @@ fn redefine_mainnet_network_disallowed() {
         .args(["project", "show"])
         .assert()
         .failure()
-        .stderr(contains("`mainnet` is a reserved network name"));
+        .stderr(contains("`ic` is a reserved network name"));
 }

crates/icp/src/context/mod.rs

@@ -10,9 +10,6 @@ use crate::{
     identity::IdentitySelection,
     network::{Configuration as NetworkConfiguration, access::NetworkAccess},
     prelude::*,
-    project::{
-        DEFAULT_LOCAL_ENVIRONMENT_NAME, DEFAULT_MAINNET_NETWORK_NAME, DEFAULT_MAINNET_NETWORK_URL,
-    },
     store_id::{IdMapping, LookupIdError},
 };
 use candid::Principal;
@@ -46,7 +43,7 @@ pub enum EnvironmentSelection {
 impl EnvironmentSelection {
     pub fn name(&self) -> &str {
         match self {
-            EnvironmentSelection::Default => DEFAULT_LOCAL_ENVIRONMENT_NAME,
+            EnvironmentSelection::Default => LOCAL,
             EnvironmentSelection::Named(name) => name,
         }
     }
@@ -160,12 +157,12 @@ impl Context {
                         name: network_name.to_owned(),
                     })?;
                     Ok(net.clone())
-                } else if network_name == DEFAULT_MAINNET_NETWORK_NAME {
+                } else if network_name == IC {
                     Ok(crate::Network {
-                        name: DEFAULT_MAINNET_NETWORK_NAME.to_string(),
+                        name: IC.to_string(),
                         configuration: crate::network::Configuration::Connected {
                             connected: crate::network::Connected {
-                                url: DEFAULT_MAINNET_NETWORK_URL.to_string(),
+                                url: IC_MAINNET_NETWORK_URL.to_string(),
                                 root_key: None,
                             },
                         },