3 files changed, 149 insertions, 9 deletions

diff --git a/crates/ra_cli/src/analysis_bench.rs b/crates/ra_cli/src/analysis_bench.rs
new file mode 100644
index 000000000..33d472838
--- /dev/null
+++ b/crates/ra_cli/src/analysis_bench.rs
@@ -0,0 +1,92 @@
+use std::{
+    path::{PathBuf, Path},
+    time::Instant,
+};
+
+use ra_db::{SourceDatabase, salsa::Database};
+use ra_ide_api::{AnalysisHost, Analysis, LineCol, FilePosition};
+
+use crate::Result;
+
+pub(crate) enum Op {
+    Highlight { path: PathBuf },
+    Complete { path: PathBuf, line: u32, column: u32 },
+}
+
+pub(crate) fn run(verbose: bool, path: &Path, op: Op) -> Result<()> {
+    let start = Instant::now();
+    eprint!("loading: ");
+    let (host, roots) = ra_batch::load_cargo(path)?;
+    let db = host.raw_database();
+    eprintln!("{:?}\n", start.elapsed());
+
+    let file_id = {
+        let path = match &op {
+            Op::Highlight { path } => path,
+            Op::Complete { path, .. } => path,
+        };
+        let path = std::env::current_dir()?.join(path).canonicalize()?;
+        roots
+            .iter()
+            .find_map(|(source_root_id, project_root)| {
+                if project_root.is_member() {
+                    for (rel_path, file_id) in &db.source_root(*source_root_id).files {
+                        let abs_path = rel_path.to_path(project_root.path());
+                        if abs_path == path {
+                            return Some(*file_id);
+                        }
+                    }
+                }
+                None
+            })
+            .ok_or_else(|| format!("Can't find {:?}", path))?
+    };
+
+    match op {
+        Op::Highlight { .. } => {
+            let res = do_work(&host, |analysis| {
+                analysis.diagnostics(file_id).unwrap();
+                analysis.highlight_as_html(file_id, false).unwrap()
+            });
+            if verbose {
+                println!("\n{}", res);
+            }
+        }
+        Op::Complete { line, column, .. } => {
+            let offset = host
+                .analysis()
+                .file_line_index(file_id)
+                .offset(LineCol { line, col_utf16: column });
+            let file_postion = FilePosition { file_id, offset };
+
+            let res = do_work(&host, |analysis| analysis.completions(file_postion));
+            if verbose {
+                println!("\n{:#?}", res);
+            }
+        }
+    }
+    Ok(())
+}
+
+fn do_work<F: Fn(&Analysis) -> T, T>(host: &AnalysisHost, work: F) -> T {
+    {
+        let start = Instant::now();
+        eprint!("from scratch:   ");
+        work(&host.analysis());
+        eprintln!("{:?}", start.elapsed());
+    }
+    {
+        let start = Instant::now();
+        eprint!("no change:      ");
+        work(&host.analysis());
+        eprintln!("{:?}", start.elapsed());
+    }
+    {
+        let start = Instant::now();
+        eprint!("trivial change: ");
+        host.raw_database().salsa_runtime().next_revision();
+        let res = work(&host.analysis());
+        eprintln!("{:?}", start.elapsed());
+        res
+    }
+}
diff --git a/crates/ra_cli/src/analysis_stats.rs b/crates/ra_cli/src/analysis_stats.rs
index d76c37d84..ed98fc7f6 100644
--- a/crates/ra_cli/src/analysis_stats.rs
+++ b/crates/ra_cli/src/analysis_stats.rs
@@ -1,4 +1,4 @@
-use std::{collections::HashSet, time::Instant, fmt::Write};
+use std::{collections::HashSet, time::Instant, fmt::Write, path::Path};
 
 use ra_db::SourceDatabase;
 use ra_hir::{Crate, ModuleDef, Ty, ImplItem, HasSource};
@@ -6,20 +6,23 @@ use ra_syntax::AstNode;
 
 use crate::Result;
 
-pub fn run(verbose: bool, path: &str, only: Option<&str>) -> Result<()> {
+pub fn run(verbose: bool, path: &Path, only: Option<&str>) -> Result<()> {
     let db_load_time = Instant::now();
-    let (host, roots) = ra_batch::load_cargo(path.as_ref())?;
+    let (host, roots) = ra_batch::load_cargo(path)?;
     let db = host.raw_database();
     println!("Database loaded, {} roots, {:?}", roots.len(), db_load_time.elapsed());
     let analysis_time = Instant::now();
     let mut num_crates = 0;
     let mut visited_modules = HashSet::new();
     let mut visit_queue = Vec::new();
-    for root in roots {
-        for krate in Crate::source_root_crates(db, root) {
-            num_crates += 1;
-            let module = krate.root_module(db).expect("crate in source root without root module");
-            visit_queue.push(module);
+    for (source_root_id, project_root) in roots {
+        if project_root.is_member() {
+            for krate in Crate::source_root_crates(db, source_root_id) {
+                num_crates += 1;
+                let module =
+                    krate.root_module(db).expect("crate in source root without root module");
+                visit_queue.push(module);
+            }
         }
     }
     println!("Crates in this dir: {}", num_crates);
diff --git a/crates/ra_cli/src/main.rs b/crates/ra_cli/src/main.rs
index 1db98aec1..5adf8b096 100644
--- a/crates/ra_cli/src/main.rs
+++ b/crates/ra_cli/src/main.rs
@@ -1,4 +1,5 @@
 mod analysis_stats;
+mod analysis_bench;
 
 use std::{io::Read, error::Error};
 
@@ -26,6 +27,27 @@ fn main() -> Result<()> {
                 .arg(Arg::with_name("only").short("o").takes_value(true))
                 .arg(Arg::with_name("path")),
         )
+        .subcommand(
+            SubCommand::with_name("analysis-bench")
+                .arg(Arg::with_name("verbose").short("v").long("verbose"))
+                .arg(
+                    Arg::with_name("highlight")
+                        .long("highlight")
+                        .takes_value(true)
+                        .conflicts_with("complete")
+                        .value_name("PATH")
+                        .help("highlight this file"),
+                )
+                .arg(
+                    Arg::with_name("complete")
+                        .long("complete")
+                        .takes_value(true)
+                        .conflicts_with("highlight")
+                        .value_name("PATH:LINE:COLUMN")
+                        .help("compute completions at this location"),
+                )
+                .arg(Arg::with_name("path").value_name("PATH").help("project to analyze")),
+        )
         .get_matches();
     match matches.subcommand() {
         ("parse", Some(matches)) => {
@@ -51,7 +73,25 @@ fn main() -> Result<()> {
             let verbose = matches.is_present("verbose");
             let path = matches.value_of("path").unwrap_or("");
             let only = matches.value_of("only");
-            analysis_stats::run(verbose, path, only)?;
+            analysis_stats::run(verbose, path.as_ref(), only)?;
+        }
+        ("analysis-bench", Some(matches)) => {
+            let verbose = matches.is_present("verbose");
+            let path = matches.value_of("path").unwrap_or("");
+            let op = if let Some(path) = matches.value_of("highlight") {
+                analysis_bench::Op::Highlight { path: path.into() }
+            } else if let Some(path_line_col) = matches.value_of("complete") {
+                let (path_line, column) = rsplit_at_char(path_line_col, ':')?;
+                let (path, line) = rsplit_at_char(path_line, ':')?;
+                analysis_bench::Op::Complete {
+                    path: path.into(),
+                    line: line.parse()?,
+                    column: column.parse()?,
+                }
+            } else {
+                panic!("either --highlight or --complete must be set")
+            };
+            analysis_bench::run(verbose, path.as_ref(), op)?;
         }
         _ => unreachable!(),
     }
@@ -68,3 +108,8 @@ fn read_stdin() -> Result<String> {
     std::io::stdin().read_to_string(&mut buff)?;
     Ok(buff)
 }
+
+fn rsplit_at_char(s: &str, c: char) -> Result<(&str, &str)> {
+    let idx = s.rfind(":").ok_or_else(|| format!("no `{}` in {}", c, s))?;
+    Ok((&s[..idx], &s[idx + 1..]))
+}