cli: Add `rad config get`

Gets a specific config value.

radicle-cli/examples/rad-config.md

@@ -6,7 +6,8 @@ $ rad config
 {
   "publicExplorer": "https://app.radicle.xyz/nodes/$host/$rid$path",
   "preferredSeeds": [
-    "z6MkrLMMsiPWUcNPHcRajuMi9mDfYckSoJyPwwnknocNYPm7@seed.radicle.garden:8776"
+    "z6MkrLMMsiPWUcNPHcRajuMi9mDfYckSoJyPwwnknocNYPm7@seed.radicle.garden:8776",
+    "z6MksmpU5b1dS7oaqF2bHXhQi1DWy2hB7Mh9CuN7y1DN6QSz@seed.radicle.xyz:8776"
   ],
   "web": {
     "pinned": {
@@ -49,3 +50,15 @@ $ rad config
   }
 }
 ```
+
+You can also get any value in the configuration by path, eg.
+
+```
+$ rad config get node.alias
+alice
+$ rad config get preferredSeeds
+z6MkrLMMsiPWUcNPHcRajuMi9mDfYckSoJyPwwnknocNYPm7@seed.radicle.garden:8776
+z6MksmpU5b1dS7oaqF2bHXhQi1DWy2hB7Mh9CuN7y1DN6QSz@seed.radicle.xyz:8776
+$ rad config get node.limits.routingMaxSize
+1000
+```

radicle-cli/src/commands/config.rs

@@ -1,5 +1,6 @@
 #![allow(clippy::or_fun_call)]
 use std::ffi::OsString;
+use std::path::Path;
 use std::process;
 
 use anyhow::anyhow;
@@ -16,9 +17,11 @@ pub const HELP: Help = Help {
 Usage
 
     rad config [<option>...]
-    rad config show
-    rad config init
-    rad config edit
+    rad config show [<option>...]
+    rad config init [<option>...]
+    rad config edit [<option>...]
+    rad config get <key> [<option>...]
+
 
     If no argument is specified, prints the current radicle configuration as JSON.
     To initialize a new configuration file, use `rad config init`.
@@ -34,6 +37,7 @@ Options
 enum Operation {
     #[default]
     Show,
+    Get(String),
     Init,
     Edit,
 }
@@ -59,6 +63,12 @@ impl Args for Options {
                     "show" => op = Some(Operation::Show),
                     "edit" => op = Some(Operation::Edit),
                     "init" => op = Some(Operation::Init),
+                    "get" => {
+                        let value = parser.value()?;
+                        let key = value.to_string_lossy();
+
+                        op = Some(Operation::Get(key.to_string()));
+                    }
                     unknown => anyhow::bail!("unknown operation '{unknown}'"),
                 },
                 _ => return Err(anyhow!(arg.unexpected())),
@@ -82,6 +92,12 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
         Operation::Show => {
             term::json::to_pretty(&profile.config, path.as_path())?.print();
         }
+        Operation::Get(key) => {
+            let data = serde_json::to_value(profile.config)?;
+            if let Some(value) = get_value(&data, &key) {
+                print_value(value)?;
+            }
+        }
         Operation::Init => {
             if path.try_exists()? {
                 anyhow::bail!("configuration file already exists at `{}`", path.display());
@@ -104,3 +120,29 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
 
     Ok(())
 }
+
+/// Get JSON value under a path.
+fn get_value<'a>(data: &'a serde_json::Value, path: &'a str) -> Option<&'a serde_json::Value> {
+    path.split('.').try_fold(data, |acc, key| {
+        if let serde_json::Value::Object(obj) = acc {
+            obj.get(key)
+        } else {
+            None
+        }
+    })
+}
+
+/// Print a JSON Value.
+fn print_value(value: &serde_json::Value) -> anyhow::Result<()> {
+    match value {
+        serde_json::Value::Null => {}
+        serde_json::Value::Bool(b) => term::print(b),
+        serde_json::Value::Array(a) => a.iter().try_for_each(print_value)?,
+        serde_json::Value::Number(n) => term::print(n),
+        serde_json::Value::String(s) => term::print(s),
+        serde_json::Value::Object(o) => {
+            term::json::to_pretty(&o, Path::new("config.json"))?.print()
+        }
+    }
+    Ok(())
+}

radicle-cli/tests/commands.rs

@@ -5,6 +5,7 @@ use std::{env, thread, time};
 use radicle::git;
 use radicle::node;
 use radicle::node::address::Store as _;
+use radicle::node::config::seeds::{RADICLE_COMMUNITY_NODE, RADICLE_TEAM_NODE};
 use radicle::node::routing::Store as _;
 use radicle::node::Handle as _;
 use radicle::node::{Alias, DEFAULT_TIMEOUT};
@@ -238,7 +239,10 @@ fn rad_inspect() {
 fn rad_config() {
     let mut environment = Environment::new();
     let alias = Alias::new("alice");
-    let profile = environment.profile(profile::Config::new(alias));
+    let profile = environment.profile(profile::Config {
+        preferred_seeds: vec![RADICLE_COMMUNITY_NODE.clone(), RADICLE_TEAM_NODE.clone()],
+        ..profile::Config::new(alias)
+    });
     let working = tempfile::tempdir().unwrap();
 
     test(