[fractal/fractal-next] checks: Use stricter rustfmt rules

[Julian Sparber <jsparber src gnome org>]

commit 3abd9fde87ac23a5d3724c8b45eae2351433c311
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Thu Jan 20 09:08:11 2022 +0100

    checks: Use stricter rustfmt rules

 .gitlab-ci.yml    |  2 +-
 .rustfmt.toml     |  8 ++++++++
 scripts/checks.sh | 14 +++++++-------
 3 files changed, 16 insertions(+), 8 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 291a55dd..ad322622 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -35,7 +35,7 @@ flatpak:
 # Configure and run code checks
 # Exits and fails if an error is encountered
 checks:
-  image: "rust:slim"
+  image: "rustlang/rust:nightly-slim"
   stage: check
   script:
     - scripts/checks.sh --verbose --force-install
diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 00000000..6aa51c16
--- /dev/null
+++ b/.rustfmt.toml
@@ -0,0 +1,8 @@
+condense_wildcard_suffixes = true
+format_code_in_doc_comments = true
+group_imports = "StdExternalCrate"
+imports_granularity = "Crate"
+newline_style = "Unix"
+normalize_comments = true
+normalize_doc_attributes = true
+wrap_comments = true
diff --git a/scripts/checks.sh b/scripts/checks.sh
index 5dd7a68a..c620445d 100755
--- a/scripts/checks.sh
+++ b/scripts/checks.sh
@@ -87,7 +87,7 @@ check_rustup() {
     if ! which rustup &> /dev/null; then
         if [[ "$1" == '-i' ]]; then
             echo -e "$Installing rustup…"
-            curl https://sh.rustup.rs -sSf  | sh -s -- -y
+            curl https://sh.rustup.rs -sSf  | sh -s -- -y --default-toolchain nightly
             export PATH=$PATH:$HOME/.cargo/bin
             if ! which rustup &> /dev/null; then
                 echo -e "$Failed to install rustup"
@@ -145,7 +145,7 @@ check_cargo() {
 
     if [[ $verbose -eq 1 ]]; then
         echo ""
-        rustc -Vv && cargo -Vv
+        rustc -Vv && cargo +nightly -Vv
     fi
 }
 
@@ -154,8 +154,8 @@ install_rustfmt() {
     check_rustup -i
 
     echo -e "$Installing rustfmt…"
-    rustup component add rustfmt
-    if ! cargo fmt --version >/dev/null 2>&1; then
+    rustup component add --toolchain nightly rustfmt
+    if ! cargo +nightly fmt --version >/dev/null 2>&1; then
         echo -e "$Failed to install rustfmt"
         exit 2
     fi
@@ -163,7 +163,7 @@ install_rustfmt() {
 
 # Run rustfmt to enforce code style.
 run_rustfmt() {
-    if ! cargo fmt --version >/dev/null 2>&1; then
+    if ! cargo +nightly fmt --version >/dev/null 2>&1; then
         if [[ $force_install -eq 1 ]]; then
             install_rustfmt
         elif [ ! -t 1 ]; then
@@ -197,11 +197,11 @@ run_rustfmt() {
 
     if [[ $verbose -eq 1 ]]; then
         echo ""
-        cargo fmt --version
+        cargo +nightly fmt --version
         echo ""
     fi
 
-    if ! cargo fmt --all -- --check; then
+    if ! cargo +nightly fmt --all -- --check; then
         echo -e "  Checking code style result: $fail"
         echo "Please fix the above issues, either manually or by running: cargo fmt --all"
         exit 1