Here we go

.vscode/settings.json

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+{
+  "fortran.linter.compiler": "gfortran",
+  "fortran.linter.includePaths": [
+    "${workspaceFolder}/build/**"
+  ],
+  "fortran.fortls.directories": [
+    "${workspaceFolder}/build/**"
+  ],
+  "fortran.formatting.formatter": "findent",
+  "fortran.formatting.findentArgs": [
+    "-i2"
+  ],
+  "todo-tree.regex.regex": "(//|#|<!--|;|/\\*|!|^|^[ \\t]*(-|\\d+.))\\s*($TAGS)",
+  // We don't want to see the mod files or the build directory because it clutters everything up.
+  "files.exclude": {
+    "**/.git": true,
+    "**/**.mod": true,
+    "build/": true,
+    "scripts/": true
+  },
+}

LICENSE

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+Copyright 2024 jordan4ibanez
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Makefile

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+default:
+	@fpm run
+
+
+windows:
+	@fpm run --c-flag -Wno-discarded-qualifiers --c-flag -Wno-incompatible-pointer-types
+
+
+gdb:
+	@MALLOC_CHECK_=2 fpm run --flag   -g --flag   -lmcheck \
+	                         --c-flag -g --c-flag -lmcheck
+
+valgrind:
+	@./scripts/create_version_info.sh
+	@valgrind --trace-children=yes --leak-check=full fpm run --flag   -g \
+	                                                         --c-flag -g
+
+
+release:
+	@fpm run --flag   -fuse-ld=mold --flag   -O3 --flag   -march=native --flag   -mtune=native --flag   -g \
+	         --c-flag -fuse-ld=mold --c-flag -O3 --c-flag -march=native --c-flag -mtune=native --c-flag -g
+
+
+mac-release:
+	@fpm run --flag   -O3 --flag   -march=native --flag   -mtune=native --flag   -g \
+	         --c-flag -O3 --c-flag -march=native --c-flag -mtune=native --c-flag -g
+
+
+.PHONY: test
+test:
+	@fpm test
+
+
+.PHONY: test_gdb
+test_gdb:
+	@MALLOC_CHECK_=2 fpm test --flag   -g --flag   -lmcheck \
+	                          --c-flag -g --c-flag -lmcheck
+
+
+.PHONY: test_valgrind
+test_valgrind:
+	@valgrind --trace-children=yes --leak-check=full fpm test --flag   -g \
+	                                                          --c-flag -g
+
+
+#! CLEANING COMMANDS.
+
+# Use this if the vscode extension gives up.
+clean:
+	@./scripts/clear_mod_files.sh
+	@./scripts/remove_build_folder.sh
+

README.md

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+# hashmap_f90
+My cool new project!

fpm.toml

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+name = "hashmap_f90"
+version = "0.1.0"
+license = "license"
+author = "jordan4ibanez"
+maintainer = "jordan4ibanez"
+copyright = "Copyright 2024, jordan4ibanez"
+
+[build]
+auto-executables = true
+auto-tests = true
+auto-examples = true
+module-naming = false
+
+[install]
+library = false
+
+[fortran]
+implicit-typing = false
+implicit-external = false
+source-form = "free"

scripts/clear_mod_files.sh

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+#!/bin/bash
+
+# The laziest script known to man.
+# https://askubuntu.com/a/377442
+find . -name "*.mod" -type f -delete

scripts/remove_build_folder.sh

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+#!/bin/bash
+rm -rf ./build/

src/hashmap_f90.f90

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+module hashmap_f90
+  implicit none
+  private
+
+  public :: say_hello
+contains
+  subroutine say_hello
+    print *, "Hello, hashmap_f90!"
+  end subroutine say_hello
+end module hashmap_f90