Remove itertools dependency

Cargo.toml

@@ -33,7 +33,6 @@ async-trait = "0.1.41"
 fnv = "1.0.6"
 futures = "0.3.6"
 indexmap = "1.6.0"
-itertools = "0.9.0"
 once_cell = "1.3.1"
 pin-project-lite = "0.1.10"
 regex = "1.4.1"

derive/Cargo.toml

@@ -22,6 +22,5 @@ syn = { version = "1.0.44", features = ["full", "extra-traits", "visit-mut"] }
 quote = "1.0.3"
 Inflector = "0.11.4"
 proc-macro-crate = "0.1.4"
-itertools = "0.9.0"
 darling = "0.10"
 thiserror = "1.0"

examples

@@ -1 +1 @@
-Subproject commit f085046edb8933754ddc71c5da577d7b44bcf0bb
+Subproject commit cb3360847366d2fd70a33eb5f9df60e90e8979da

src/registry/export_sdl.rs

@@ -1,7 +1,5 @@
 use std::fmt::Write;
 
-use itertools::Itertools;
-
 use crate::registry::{MetaField, MetaInputValue, MetaType, Registry};
 
 impl Registry {
@@ -59,18 +57,14 @@ impl Registry {
                 .ok();
             }
             if !field.args.is_empty() {
-                write!(
-                    sdl,
-                    "\t{}({}): {}",
-                    field.name,
-                    field
-                        .args
-                        .values()
-                        .map(|arg| export_input_value(arg))
-                        .join(", "),
-                    field.ty
-                )
-                .ok();
+                write!(sdl, "\t{}(", field.name).ok();
+                for (i, arg) in field.args.values().enumerate() {
+                    if i != 0 {
+                        sdl.push_str(", ");
+                    }
+                    sdl.push_str(&export_input_value(arg));
+                }
+                write!(sdl, "): {}", field.ty).ok();
             } else {
                 write!(sdl, "\t{}: {}", field.name, field.ty).ok();
             }
@@ -137,7 +131,10 @@ impl Registry {
                 write!(sdl, "type {} ", name).ok();
                 if let Some(implements) = self.implements.get(name) {
                     if !implements.is_empty() {
-                        write!(sdl, "implements {} ", implements.iter().join(" & ")).ok();
+                        write!(sdl, "implements ").ok();
+                        for interface in implements {
+                            write!(sdl, "& {} ", interface).ok();
+                        }
                     }
                 }
 
@@ -223,13 +220,11 @@ impl Registry {
                 if description.is_some() && !federation {
                     writeln!(sdl, "\"\"\"\n{}\n\"\"\"", description.unwrap()).ok();
                 }
-                writeln!(
-                    sdl,
-                    "union {} = {}",
-                    name,
-                    possible_types.iter().join(" | ")
-                )
-                .ok();
+                write!(sdl, "union {} =", name).ok();
+                for ty in possible_types {
+                    write!(sdl, " | {}", ty).ok();
+                }
+                writeln!(sdl).ok();
             }
         }
     }

src/schema.rs

@@ -6,7 +6,6 @@ use std::sync::Arc;
 
 use futures::stream::{self, Stream, StreamExt};
 use indexmap::map::IndexMap;
-use itertools::Itertools;
 
 use crate::context::{Data, QueryEnvInner, ResolveId};
 use crate::extensions::{ErrorLogger, ExtensionContext, ExtensionFactory, Extensions};
@@ -339,7 +338,7 @@ where
             .extensions
             .iter()
             .map(|factory| factory.create())
-            .collect_vec()
+            .collect::<Vec<_>>()
             .into();
 
         let request = extensions

src/validation/suggestion.rs

@@ -1,9 +1,8 @@
 use std::collections::HashMap;
-
-use itertools::Itertools;
+use std::fmt::Write;
 
 fn levenshtein_distance(s1: &str, s2: &str) -> usize {
-    let mut column = (0..=s1.len()).collect_vec();
+    let mut column: Vec<_> = (0..=s1.len()).collect();
     for (x, rx) in s2.bytes().enumerate() {
         column[0] = x + 1;
         let mut lastdiag = x;
@@ -40,12 +39,20 @@ where
     }
     selected.sort_by(|a, b| distances[a].cmp(&distances[b]));
 
-    Some(format!(
-        "{} {}?",
-        prefix,
-        selected
-            .into_iter()
-            .map(|s| format!("\"{}\"", s))
-            .join(", ")
-    ))
+    let mut suggestion = String::with_capacity(
+        prefix.len() + selected.iter().map(|s| s.len() + 5).sum::<usize>()
+    );
+    suggestion.push_str(prefix);
+    suggestion.push(' ');
+
+    for (i, s) in selected.iter().enumerate() {
+        if i != 0 {
+            suggestion.push_str(" , ");
+        }
+        write!(suggestion, "\"{}\"", s).unwrap();
+    }
+
+    suggestion.push('?');
+
+    Some(suggestion)
 }