Extend functionality of tango benchmark helpers (#13107)

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Refactors the tango helpers in the toolkit and makes them more flexible
(e.g., being able to benchmark any branch against any branch, not just
current and main).

# User-Facing Changes
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helps us keep track of breaking changes. -->

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toolkit.nu

@@ -491,29 +491,73 @@ export def cov [] {
     print $"Coverage generation took ($end - $start)."
 }
 
-
-# Benchmark the current branch against the main branch
+# Benchmark a target revision (default: current branch) against a reference revision (default: main branch)
+#
+# Results are saved in a `./tango` directory
 # Ensure you have `cargo-export` installed to generate separate artifacts for each branch.
-export def "benchmark-current-branch-with-main" [] {
-    let main = "main"
-    let current_branch = (git branch --show-current)
+export def benchmark-compare [
+    target?: string     # which branch to compare (default: current branch)
+    reference?: string  # the reference to compare against (default: main branch)
+] {
+    let reference = $reference | default "main"
+    let current = git branch --show-current
+    let target = $target | default $current
 
-    cargo export $"target/($current_branch)" -- bench
-    git checkout $main
-    cargo export $"target/($main)" -- bench
-    git checkout $current_branch
-    ^$"./target/($current_branch)/benchmarks" compare $"./target/($main)/benchmarks" -o -s 50
+    print $'-- Benchmarking ($target) against ($reference)'
+
+    let export_dir = $env.PWD | path join "tango"
+    let ref_bin_dir = $export_dir | path join bin $reference
+    let tgt_bin_dir = $export_dir | path join bin $target
+
+    # benchmark the target revision
+    print $'-- Running benchmarks for ($target)'
+    git checkout $target
+    cargo export $tgt_bin_dir -- bench
+
+    # benchmark the comparison reference revision
+    print $'-- Running benchmarks for ($reference)'
+    git checkout $reference
+    cargo export $ref_bin_dir -- bench
+
+    # return back to the whatever revision before benchmarking
+    print '-- Done'
+    git checkout $current
+
+    # report results
+    let reference_bin = $ref_bin_dir | path join benchmarks
+    let target_bin = $tgt_bin_dir | path join benchmarks
+    ^$target_bin compare $reference_bin -o -s 50 --dump ($export_dir | path join samples)
 }
 
-# Benchmark the current branch and logs the result in `./target/samples`
+# Benchmark the current branch and logs the result in `./tango/samples`
+#
+# Results are saved in a `./tango` directory
 # Ensure you have `cargo-export` installed to generate separate artifacts for each branch.
-export def "benchmark-and-log-result" [] {
-    let current_branch = (git branch --show-current)
-    let current_dir = "./" | path expand
-    let res_path = $"($current_dir)/target/samples"
+export def benchmark-log [
+    target?: string     # which branch to compare (default: current branch)
+] {
+    let current = git branch --show-current
+    let target = $target | default $current
+    print $'-- Benchmarking ($target)'
 
-    cargo export $"target/($current_branch)" -- bench
-    ^$"./target/($current_branch)/benchmarks" compare -o -s 50 --dump $res_path
+    let export_dir = $env.PWD | path join "tango"
+    let bin_dir = ($export_dir | path join bin $target)
+
+    # benchmark the target revision
+    if $target != $current {
+        git checkout $target
+    }
+    cargo export $bin_dir -- bench
+
+    # return back to the whatever revision before benchmarking
+    print '-- Done'
+    if $target != $current {
+        git checkout $current
+    }
+
+    # report results
+    let bench_bin = ($bin_dir | path join benchmarks)
+    ^$bench_bin compare -o -s 50 --dump ($export_dir | path join samples)
 }
 
 # Build all Windows archives and MSIs for release manually