use comfy_table for output

Cargo.lock

@@ -2,6 +2,207 @@
 # It is not intended for manual editing.
 version = 4
 
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4512299f36f043ab09a583e57bceb5a5aab7a73db1805848e8fef3c9e8c78b3"
+
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+checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
+
+[[package]]
+name = "comfy-table"
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+checksum = "958c5d6ecf1f214b4c2bbbbf6ab9523a864bd136dcf71a7e8904799acfe1ad47"
+dependencies = [
+ "crossterm",
+ "unicode-segmentation",
+ "unicode-width",
+]
+
+[[package]]
+name = "crossterm"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8b9f2e4c67f833b660cdb0a3523065869fb35570177239812ed4c905aeff87b"
+dependencies = [
+ "bitflags",
+ "crossterm_winapi",
+ "document-features",
+ "parking_lot",
+ "rustix",
+ "winapi",
+]
+
+[[package]]
+name = "crossterm_winapi"
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+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "document-features"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4b8a88685455ed29a21542a33abd9cb6510b6b129abadabdcef0f4c55bc8f61"
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+ "litrs",
+]
+
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+checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
+dependencies = [
+ "libc",
+ "windows-sys",
+]
+
+[[package]]
+name = "libc"
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+dependencies = [
+ "scopeguard",
+]
+
 [[package]]
 name = "ngram-entropy"
 version = "0.1.0"
+dependencies = [
+ "comfy-table",
+]
+
+[[package]]
+name = "parking_lot"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93857453250e3077bd71ff98b6a65ea6621a19bb0f559a85248955ac12c45a1a"
+dependencies = [
+ "lock_api",
+ "parking_lot_core",
+]
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "windows-link",
+]
+
+[[package]]
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+]
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+dependencies = [
+ "bitflags",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys",
+]
+
+[[package]]
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+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]

Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+comfy-table = "7.2.2"

src/main.rs

@@ -6,6 +6,8 @@ use std::{
     process,
 };
 
+use comfy_table::{CellAlignment, ContentArrangement, Table, presets::UTF8_FULL};
+
 const USAGE: &str = "\
 usage: (ngram-entropy) | (ngram-entropy N) | (ngram-entropy MIN MAX)\
 ";
@@ -37,16 +39,29 @@ fn main() {
     let mut src = Vec::new();
     io::stdin().read_to_end(&mut src).unwrap();
 
-    let mut table: HashMap<&[u8], u64> = HashMap::new();
+    let mut table = Table::new();
+    table
+        .load_preset(UTF8_FULL)
+        .apply_modifier(comfy_table::modifiers::UTF8_SOLID_INNER_BORDERS)
+        .set_content_arrangement(ContentArrangement::Dynamic)
+        .set_header(["n", "bits", "bits/byte", "unique ngrams"]);
+    for column in table.column_iter_mut() {
+        column.set_cell_alignment(CellAlignment::Right);
+    }
+
+    let mut counts: HashMap<&[u8], u64> = HashMap::new();
 
     for n in min..=max {
-        let (ngrams, freqs) = ngram_freqs(n, &src, &mut table);
+        let (ngrams, freqs) = ngram_freqs(n, &src, &mut counts);
         let bits = entropy(freqs);
-        println!(
+        table.add_row([
-            "{n:2}: {bits:6.3} bits, {:.3} bits/byte ({ngrams} unique ngrams)",
+            n.to_string(),
-            bits / n as f64
+            format!("{bits:.3}"),
-        );
+            format!("{:.3}", bits / n as f64),
+            ngrams.to_string(),
+        ]);
     }
+    println!("{table}");
 }
 
 fn ngram_freqs<'a>(