feat: add command get for doing queries

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/cuddle/src/cli.rs

@@ -0,0 +1,88 @@
+use std::{borrow::BorrowMut, io::Write};
+
+use anyhow::anyhow;
+use get_command::GetCommand;
+
+use crate::{cuddle_state::Cuddle, state::ValidatedState};
+
+mod get_command;
+
+pub struct Cli {
+    cli: clap::Command,
+    cuddle: Cuddle<ValidatedState>,
+}
+
+impl Cli {
+    pub fn new(cuddle: Cuddle<ValidatedState>) -> Self {
+        let cli = clap::Command::new("cuddle").subcommand_required(true);
+
+        Self { cli, cuddle }
+    }
+
+    pub async fn setup(mut self) -> anyhow::Result<Self> {
+        let commands = self.get_commands().await?;
+
+        self.cli = self.cli.subcommands(commands);
+
+        // TODO: Add global
+        // TODO: Add components
+
+        Ok(self)
+    }
+
+    async fn get_commands(&self) -> anyhow::Result<Vec<clap::Command>> {
+        Ok(vec![
+            clap::Command::new("do").subcommand_required(true),
+            clap::Command::new("get")
+                .about(GetCommand::description())
+                .arg(
+                    clap::Arg::new("query")
+                        .required(true)
+                        .help("query is how values are extracted, '.project.name' etc"),
+                ),
+        ])
+    }
+
+    pub async fn execute(self) -> anyhow::Result<()> {
+        match self
+            .cli
+            .get_matches_from(std::env::args())
+            .subcommand()
+            .ok_or(anyhow::anyhow!("failed to find subcommand"))?
+        {
+            ("do", _args) => {
+                tracing::debug!("executing do");
+            }
+            ("get", args) => {
+                let query = args
+                    .get_one::<String>("query")
+                    .ok_or(anyhow!("query is required"))?;
+
+                let res = GetCommand::new(self.cuddle).execute(query).await?;
+
+                std::io::stdout().write_all(res.as_bytes())?;
+                std::io::stdout().write_all("\n".as_bytes())?;
+            }
+            _ => {}
+        }
+
+        Ok(())
+    }
+
+    async fn add_project_commands(&self) -> anyhow::Result<Vec<clap::Command>> {
+        if let Some(_project) = self.cuddle.state.project.as_ref() {
+            // Add project level commands
+            return Ok(vec![]);
+        }
+
+        Ok(Vec::new())
+    }
+
+    async fn add_plan_commands(self) -> anyhow::Result<Self> {
+        if let Some(_plan) = self.cuddle.state.plan.as_ref() {
+            // Add plan level commands
+        }
+
+        Ok(self)
+    }
+}

crates/cuddle/src/cli/get_command.rs

@@ -0,0 +1,124 @@
+use crate::{
+    cuddle_state::Cuddle,
+    state::{
+        validated_project::{Project, Value},
+        ValidatedState,
+    },
+};
+
+pub struct GetCommand {
+    query_engine: ProjectQueryEngine,
+}
+
+impl GetCommand {
+    pub fn new(cuddle: Cuddle<ValidatedState>) -> Self {
+        Self {
+            query_engine: ProjectQueryEngine::new(
+                &cuddle
+                    .state
+                    .project
+                    .expect("we should always have a project if get command is available"),
+            ),
+        }
+    }
+
+    pub async fn execute(&self, query: &str) -> anyhow::Result<String> {
+        let res = self
+            .query_engine
+            .query(query)?
+            .ok_or(anyhow::anyhow!("query was not found in project"))?;
+
+        match res {
+            Value::String(s) => Ok(s),
+            Value::Bool(b) => Ok(b.to_string()),
+            Value::Array(value) => {
+                let val = serde_json::to_string_pretty(&value)?;
+                Ok(val)
+            }
+            Value::Map(value) => {
+                let val = serde_json::to_string_pretty(&value)?;
+                Ok(val)
+            }
+        }
+    }
+
+    pub fn description() -> String {
+        "get returns a given variable from the project given a key, following a jq like schema (.project.name, etc.)"
+            .into()
+    }
+}
+
+pub struct ProjectQueryEngine {
+    project: Project,
+}
+
+impl ProjectQueryEngine {
+    pub fn new(project: &Project) -> Self {
+        Self {
+            project: project.clone(),
+        }
+    }
+
+    pub fn query(&self, query: &str) -> anyhow::Result<Option<Value>> {
+        let parts = query
+            .split('.')
+            .filter(|i| !i.is_empty())
+            .collect::<Vec<&str>>();
+
+        Ok(self.traverse(&parts, &self.project.value))
+    }
+
+    fn traverse(&self, query: &[&str], value: &Value) -> Option<Value> {
+        match query.split_first() {
+            Some((key, rest)) => match value {
+                Value::Map(items) => {
+                    let item = items.get(*key)?;
+
+                    self.traverse(rest, item)
+                }
+                _ => {
+                    tracing::warn!(
+                        "key: {} doesn't have a corresponding value: {:?}",
+                        key,
+                        value
+                    );
+                    None
+                }
+            },
+            None => Some(value.clone()),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::path::PathBuf;
+
+    use super::*;
+
+    #[tokio::test]
+    async fn test_can_query_item() -> anyhow::Result<()> {
+        let project = ProjectQueryEngine::new(&Project {
+            value: Value::Map(
+                [(
+                    String::from("project"),
+                    Value::Map(
+                        [(
+                            String::from("name"),
+                            Value::String(String::from("something")),
+                        )]
+                        .into(),
+                    ),
+                )]
+                .into(),
+            ),
+            root: PathBuf::new(),
+        });
+
+        let res = project.query(".project.name")?;
+
+        assert_eq!(Some(Value::String("something".into())), res);
+
+        Ok(())
+    }
+}

crates/cuddle/src/main.rs

@@ -1,6 +1,7 @@
+use cli::Cli;
 use cuddle_state::Cuddle;
-use state::ValidatedState;
 
+mod cli;
 mod cuddle_state;
 mod plan;
 mod project;
@@ -24,68 +25,3 @@ async fn main() -> anyhow::Result<()> {
 
     Ok(())
 }
-
-pub struct Cli {
-    cli: clap::Command,
-    cuddle: Cuddle<ValidatedState>,
-}
-
-impl Cli {
-    pub fn new(cuddle: Cuddle<ValidatedState>) -> Self {
-        let cli = clap::Command::new("cuddle").subcommand_required(true);
-
-        Self { cli, cuddle }
-    }
-
-    pub async fn setup(mut self) -> anyhow::Result<Self> {
-        let commands = self.get_commands().await?;
-
-        self.cli = self.cli.subcommands(commands);
-
-        // TODO: Add global
-        // TODO: Add components
-
-        Ok(self)
-    }
-
-    pub async fn execute(self) -> anyhow::Result<()> {
-        match self
-            .cli
-            .get_matches_from(std::env::args())
-            .subcommand()
-            .ok_or(anyhow::anyhow!("failed to find subcommand"))?
-        {
-            ("do", _args) => {
-                tracing::debug!("executing do");
-            }
-            ("get", _args) => {}
-            _ => {}
-        }
-
-        Ok(())
-    }
-
-    async fn get_commands(&self) -> anyhow::Result<Vec<clap::Command>> {
-        Ok(vec![
-            clap::Command::new("do").subcommand_required(true),
-            clap::Command::new("get"),
-        ])
-    }
-
-    async fn add_project_commands(&self) -> anyhow::Result<Vec<clap::Command>> {
-        if let Some(_project) = self.cuddle.state.project.as_ref() {
-            // Add project level commands
-            return Ok(vec![]);
-        }
-
-        Ok(Vec::new())
-    }
-
-    async fn add_plan_commands(self) -> anyhow::Result<Self> {
-        if let Some(_plan) = self.cuddle.state.plan.as_ref() {
-            // Add plan level commands
-        }
-
-        Ok(self)
-    }
-}

crates/cuddle/src/state/validated_project.rs

@@ -4,10 +4,12 @@ use std::{
 };
 
 use anyhow::anyhow;
+use serde::Serialize;
 use toml::Table;
 
 use crate::project::CUDDLE_PROJECT_FILE;
 
+#[derive(Clone)]
 pub struct Project {
     pub value: Value,
     pub root: PathBuf,
@@ -29,6 +31,7 @@ impl Project {
             .ok_or(anyhow!("cuddle.toml doesn't provide a [project] table"))?;
 
         let value: Value = project.into();
+        let value = Value::Map([("project".to_string(), value)].into());
 
         Ok(Self::new(value, root))
     }
@@ -46,6 +49,8 @@ impl Project {
     }
 }
 
+#[derive(Clone, PartialEq, Eq, Debug, Serialize)]
+#[serde(untagged)]
 pub enum Value {
     String(String),
     Bool(bool),