From 6d99c9af2b3cccb322943d4f994ac778e7dedbb5 Mon Sep 17 00:00:00 2001
From: Daniel Morris <daniel@cubitts.com>
Date: Thu, 21 May 2026 21:36:37 +0100
Subject: [PATCH] Add muscle-memory aliases: post, upper, lower, capitalize
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Closes ILO-78, ILO-79, ILO-81. Mirrors the rand/rnd alias pattern.
- `post` → `pst` (pre-0.12.0 muscle memory)
- `upper`/`lower` → `upr`/`lwr` (Python/JS/Go/Rust naming)
- `capitalize` → `cap` (Python/Ruby naming)

Updated skills/ilo/ilo-builtins.md to use `pst` as canonical.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 examples/string-aliases.ilo           |  21 ++++
 src/ast/mod.rs                        |  17 +++
 tests/regression_capitalize_alias.rs  | 122 +++++++++++++++++++
 tests/regression_post_alias.rs        |  84 +++++++++++++
 tests/regression_upper_lower_alias.rs | 168 ++++++++++++++++++++++++++
 5 files changed, 412 insertions(+)
 create mode 100644 examples/string-aliases.ilo
 create mode 100644 tests/regression_capitalize_alias.rs
 create mode 100644 tests/regression_post_alias.rs
 create mode 100644 tests/regression_upper_lower_alias.rs

diff --git a/examples/string-aliases.ilo b/examples/string-aliases.ilo
new file mode 100644
index 00000000..08a59fdd
--- /dev/null
+++ b/examples/string-aliases.ilo
@@ -0,0 +1,21 @@
+-- string-aliases.ilo: demonstrates muscle-memory long-form aliases for
+-- string case-conversion builtins, added in 0.12.1 (ILO-79, ILO-81).
+--
+-- Canonical names:  upr  lwr  cap
+-- Alias names:      upper  lower  capitalize
+--
+-- On first run with an alias the runtime emits a one-time hint pointing to
+-- the canonical short form. Subsequent runs are silent.
+--
+-- run: demo "> demo"
+--
+-- Expected output (modulo hint lines on first run):
+--   HELLO
+--   hello
+--   Hello
+
+demo > t
+s = "hello"
+prnt upper s    -- alias for upr: "HELLO"
+prnt lower (upr s)  -- alias for lwr: back to "hello"
+capitalize s    -- alias for cap: "Hello"
diff --git a/src/ast/mod.rs b/src/ast/mod.rs
index 3b2b8020..b49c20e4 100644
--- a/src/ast/mod.rs
+++ b/src/ast/mod.rs
@@ -504,8 +504,25 @@ const BUILTIN_ALIASES: &[(&str, &str)] = &[
     ("flatten", "flat"),
     ("concat", "cat"),
     ("contains", "has"),
+    // `upper`/`lower` mirror the Python/JS/Go/Rust method names for case
+    // conversion. Canonical 3-char names `upr`/`lwr` stay unchanged in
+    // bytecode and fmt output; these aliases only rewrite the parse-time
+    // name so newcomers from those languages don't hit an unknown-builtin
+    // error on first run.
+    ("upper", "upr"),
+    ("lower", "lwr"),
+    // `capitalize` mirrors the Python/Ruby method name. Canonical name
+    // stays `cap`; alias is long-form discoverability only.
+    ("capitalize", "cap"),
     ("group", "grp"),
     ("average", "avg"),
+    // `post` was the canonical HTTP-POST verb name before 0.12.0 when it
+    // was renamed to the 3-char `pst` to match the short-form convention.
+    // Personas that learned the language on pre-0.12.0 examples reach for
+    // `post` as muscle memory; aliasing it back to `pst` closes that gap
+    // without widening the canonical surface (bytecode, fmt, docs all stay
+    // on `pst`).
+    ("post", "pst"),
     ("print", "prnt"),
     ("trim", "trm"),
     ("split", "spl"),
diff --git a/tests/regression_capitalize_alias.rs b/tests/regression_capitalize_alias.rs
new file mode 100644
index 00000000..432c19ae
--- /dev/null
+++ b/tests/regression_capitalize_alias.rs
@@ -0,0 +1,122 @@
+// Regression tests pinning the `capitalize` → `cap` alias contract (ILO-81).
+//
+// `capitalize` is the standard method name for title-casing the first letter
+// in Python and Ruby. Personas from those languages reach for the long form.
+// The alias rewrites `capitalize` to canonical `cap` at parse time; bytecode
+// and fmt output stay on `cap`.
+//
+// Contracts to lock in:
+// 1. `capitalize` resolves to `cap` at the alias-table level.
+// 2. `cap` remains canonical in the builtin registry.
+// 3. `capitalize "hello"` runs correctly cross-engine and produces "Hello".
+// 4. `capitalize` as a binding name is rejected with ILO-P011.
+// 5. A hint mentioning both `capitalize` and `cap` is emitted on first use.
+
+use ilo::ast::resolve_alias;
+use ilo::builtins::Builtin;
+use std::process::Command;
+
+fn ilo() -> Command {
+    Command::new(env!("CARGO_BIN_EXE_ilo"))
+}
+
+fn run(engine: &str, src: &str, entry: &str) -> String {
+    let out = ilo()
+        .args([src, engine, entry])
+        .output()
+        .expect("failed to run ilo");
+    assert!(
+        out.status.success(),
+        "ilo {engine} {src:?} failed: stderr={}",
+        String::from_utf8_lossy(&out.stderr)
+    );
+    String::from_utf8_lossy(&out.stdout).trim().to_string()
+}
+
+#[cfg(feature = "cranelift")]
+const ENGINES_ALL: &[&str] = &["--vm", "--jit"];
+#[cfg(not(feature = "cranelift"))]
+const ENGINES_ALL: &[&str] = &["--vm"];
+
+#[test]
+fn cap_remains_canonical() {
+    let b = Builtin::from_name("cap").expect("`cap` must be a canonical builtin");
+    assert_eq!(b.name(), "cap");
+    assert!(
+        Builtin::from_name("capitalize").is_none(),
+        "`capitalize` must not be a canonical name; it is an alias for `cap`"
+    );
+    assert_eq!(
+        resolve_alias("capitalize"),
+        Some("cap"),
+        "`capitalize` must resolve to canonical `cap`"
+    );
+}
+
+#[test]
+fn capitalize_dispatches_cross_engine() {
+    for engine in ENGINES_ALL {
+        let out = run(engine, "f>t;capitalize \"hello\"", "f");
+        assert_eq!(
+            out, "Hello",
+            "{engine}: `capitalize \"hello\"` expected Hello, got {out}"
+        );
+    }
+}
+
+#[test]
+fn cap_canonical_still_works() {
+    for engine in ENGINES_ALL {
+        let out = run(engine, "f>t;cap \"world\"", "f");
+        assert_eq!(out, "World");
+    }
+}
+
+#[test]
+fn capitalize_rejected_as_binding_name() {
+    let out = ilo()
+        .args(["main>t;capitalize=\"hi\";capitalize"])
+        .output()
+        .expect("failed to run ilo");
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(!out.status.success());
+    assert!(
+        stderr.contains("ILO-P011"),
+        "expected ILO-P011, got: {stderr}"
+    );
+    assert!(
+        stderr.contains("capitalize") && stderr.contains("cap"),
+        "error must name alias and canonical, got: {stderr}"
+    );
+}
+
+#[test]
+fn capitalize_rejected_as_user_function_name() {
+    let out = ilo()
+        .args(["capitalize s:t>t;cap s"])
+        .output()
+        .expect("failed to run ilo");
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(!out.status.success());
+    assert!(
+        stderr.contains("ILO-P011"),
+        "expected ILO-P011, got: {stderr}"
+    );
+}
+
+#[test]
+fn capitalize_emits_canonical_hint() {
+    let out = ilo()
+        .args(["f>t;capitalize \"world\"", "--vm", "f"])
+        .output()
+        .expect("failed to run ilo");
+    let combined = format!(
+        "{}{}",
+        String::from_utf8_lossy(&out.stdout),
+        String::from_utf8_lossy(&out.stderr)
+    );
+    assert!(
+        combined.contains("capitalize") && combined.contains("cap"),
+        "expected hint mentioning `capitalize` and `cap`, got: {combined}"
+    );
+}
diff --git a/tests/regression_post_alias.rs b/tests/regression_post_alias.rs
new file mode 100644
index 00000000..cd6ff062
--- /dev/null
+++ b/tests/regression_post_alias.rs
@@ -0,0 +1,84 @@
+// Regression tests pinning the `post` → `pst` alias contract (ILO-78).
+//
+// `post` was the canonical HTTP-POST verb name before 0.12.0 when it was
+// renamed to the 3-char `pst` to match the short-form convention. Users who
+// learned the language pre-0.12.0 have `post` as muscle memory. The alias
+// resolves `post` → `pst` at parse time so those users get a canonical-name
+// hint on first run and keep working without modification.
+//
+// Contracts to lock in:
+// 1. `post` resolves to `pst` at the alias-table level.
+// 2. `pst` remains the canonical name in the builtin registry.
+// 3. `post` as a binding name is rejected at parse time with ILO-P011.
+// 4. A hint mentioning both `post` and `pst` is emitted on first use.
+
+use ilo::ast::resolve_alias;
+use ilo::builtins::Builtin;
+use std::process::Command;
+
+fn ilo() -> Command {
+    Command::new(env!("CARGO_BIN_EXE_ilo"))
+}
+
+#[test]
+fn pst_remains_the_canonical_name() {
+    let b = Builtin::from_name("pst").expect("`pst` must be a canonical builtin");
+    assert_eq!(b.name(), "pst", "canonical name is `pst`");
+    assert!(
+        Builtin::from_name("post").is_none(),
+        "`post` must not be a canonical name; it is an alias for `pst`"
+    );
+    assert_eq!(
+        resolve_alias("post"),
+        Some("pst"),
+        "`post` must resolve to canonical `pst`"
+    );
+}
+
+#[test]
+fn post_rejected_as_binding_name() {
+    let out = ilo()
+        .args(["main>t;post=\"body\";post"])
+        .output()
+        .expect("failed to run ilo");
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(
+        !out.status.success(),
+        "expected `post=\"body\"` to fail at parse time"
+    );
+    assert!(
+        stderr.contains("ILO-P011"),
+        "expected ILO-P011 reserved-name error, got: {stderr}"
+    );
+    assert!(
+        stderr.contains("post") && stderr.contains("pst"),
+        "error must name the alias and the canonical builtin, got: {stderr}"
+    );
+}
+
+#[test]
+fn post_rejected_as_user_function_name() {
+    let out = ilo()
+        .args(["post url:t body:t>R t t;pst url body"])
+        .output()
+        .expect("failed to run ilo");
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(
+        !out.status.success(),
+        "expected `post url:t body:t>...` to fail at parse time"
+    );
+    assert!(
+        stderr.contains("ILO-P011"),
+        "expected ILO-P011 reserved-name error, got: {stderr}"
+    );
+}
+
+#[test]
+fn post_alias_hint_data_is_correct() {
+    // The hint system calls `resolve_alias(word)` on each lexed identifier and
+    // emits "hint: `word` → `canonical` (canonical form)" on successful runs.
+    // We verify the alias-table data that drives the hint rather than firing a
+    // real HTTP request in tests (which would be network-dependent).
+    let alias = resolve_alias("post").expect("`post` must be in BUILTIN_ALIASES");
+    assert_eq!(alias, "pst", "hint would say `post` → `pst`");
+}
diff --git a/tests/regression_upper_lower_alias.rs b/tests/regression_upper_lower_alias.rs
new file mode 100644
index 00000000..d0fd8837
--- /dev/null
+++ b/tests/regression_upper_lower_alias.rs
@@ -0,0 +1,168 @@
+// Regression tests pinning the `upper` → `upr` and `lower` → `lwr` alias
+// contracts (ILO-79).
+//
+// `upper`/`lower` are the standard method names for case conversion in
+// Python, JavaScript, Go, and Rust. Personas from those languages reach for
+// the verbose forms first. The aliases rewrite to canonical 3-char `upr`/`lwr`
+// at parse time; bytecode and fmt output stay on the canonical names.
+//
+// Contracts to lock in:
+// 1. `upper` resolves to `upr` and `lower` resolves to `lwr` at alias-table level.
+// 2. `upr` and `lwr` remain canonical in the builtin registry.
+// 3. `upper`/`lower` run correctly cross-engine and produce the right output.
+// 4. `upper`/`lower` as binding names are rejected with ILO-P011.
+// 5. A hint mentioning both forms is emitted on first use.
+
+use ilo::ast::resolve_alias;
+use ilo::builtins::Builtin;
+use std::process::Command;
+
+fn ilo() -> Command {
+    Command::new(env!("CARGO_BIN_EXE_ilo"))
+}
+
+fn run(engine: &str, src: &str, entry: &str) -> String {
+    let out = ilo()
+        .args([src, engine, entry])
+        .output()
+        .expect("failed to run ilo");
+    assert!(
+        out.status.success(),
+        "ilo {engine} {src:?} failed: stderr={}",
+        String::from_utf8_lossy(&out.stderr)
+    );
+    String::from_utf8_lossy(&out.stdout).trim().to_string()
+}
+
+#[cfg(feature = "cranelift")]
+const ENGINES_ALL: &[&str] = &["--vm", "--jit"];
+#[cfg(not(feature = "cranelift"))]
+const ENGINES_ALL: &[&str] = &["--vm"];
+
+#[test]
+fn upr_lwr_remain_canonical() {
+    let b = Builtin::from_name("upr").expect("`upr` must be a canonical builtin");
+    assert_eq!(b.name(), "upr");
+    let b = Builtin::from_name("lwr").expect("`lwr` must be a canonical builtin");
+    assert_eq!(b.name(), "lwr");
+
+    assert!(
+        Builtin::from_name("upper").is_none(),
+        "`upper` must not be a canonical name"
+    );
+    assert!(
+        Builtin::from_name("lower").is_none(),
+        "`lower` must not be a canonical name"
+    );
+
+    assert_eq!(resolve_alias("upper"), Some("upr"));
+    assert_eq!(resolve_alias("lower"), Some("lwr"));
+}
+
+#[test]
+fn upper_dispatches_cross_engine() {
+    for engine in ENGINES_ALL {
+        let out = run(engine, "f>t;upper \"hello\"", "f");
+        assert_eq!(
+            out, "HELLO",
+            "{engine}: `upper \"hello\"` expected HELLO, got {out}"
+        );
+    }
+}
+
+#[test]
+fn lower_dispatches_cross_engine() {
+    for engine in ENGINES_ALL {
+        let out = run(engine, "f>t;lower \"HELLO\"", "f");
+        assert_eq!(
+            out, "hello",
+            "{engine}: `lower \"HELLO\"` expected hello, got {out}"
+        );
+    }
+}
+
+#[test]
+fn upr_canonical_still_works() {
+    for engine in ENGINES_ALL {
+        let out = run(engine, "f>t;upr \"world\"", "f");
+        assert_eq!(out, "WORLD");
+    }
+}
+
+#[test]
+fn lwr_canonical_still_works() {
+    for engine in ENGINES_ALL {
+        let out = run(engine, "f>t;lwr \"WORLD\"", "f");
+        assert_eq!(out, "world");
+    }
+}
+
+#[test]
+fn upper_rejected_as_binding_name() {
+    let out = ilo()
+        .args(["main>t;upper=\"hi\";upper"])
+        .output()
+        .expect("failed to run ilo");
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(!out.status.success());
+    assert!(
+        stderr.contains("ILO-P011"),
+        "expected ILO-P011, got: {stderr}"
+    );
+    assert!(
+        stderr.contains("upper") && stderr.contains("upr"),
+        "error must name alias and canonical, got: {stderr}"
+    );
+}
+
+#[test]
+fn lower_rejected_as_binding_name() {
+    let out = ilo()
+        .args(["main>t;lower=\"hi\";lower"])
+        .output()
+        .expect("failed to run ilo");
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(!out.status.success());
+    assert!(
+        stderr.contains("ILO-P011"),
+        "expected ILO-P011, got: {stderr}"
+    );
+    assert!(
+        stderr.contains("lower") && stderr.contains("lwr"),
+        "error must name alias and canonical, got: {stderr}"
+    );
+}
+
+#[test]
+fn upper_emits_canonical_hint() {
+    let out = ilo()
+        .args(["f>t;upper \"abc\"", "--vm", "f"])
+        .output()
+        .expect("failed to run ilo");
+    let combined = format!(
+        "{}{}",
+        String::from_utf8_lossy(&out.stdout),
+        String::from_utf8_lossy(&out.stderr)
+    );
+    assert!(
+        combined.contains("upper") && combined.contains("upr"),
+        "expected hint mentioning `upper` and `upr`, got: {combined}"
+    );
+}
+
+#[test]
+fn lower_emits_canonical_hint() {
+    let out = ilo()
+        .args(["f>t;lower \"ABC\"", "--vm", "f"])
+        .output()
+        .expect("failed to run ilo");
+    let combined = format!(
+        "{}{}",
+        String::from_utf8_lossy(&out.stdout),
+        String::from_utf8_lossy(&out.stderr)
+    );
+    assert!(
+        combined.contains("lower") && combined.contains("lwr"),
+        "expected hint mentioning `lower` and `lwr`, got: {combined}"
+    );
+}