foxgirl.engineering
tools for building gleam projects with nix
docs: document gleam-tool
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---
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title: gleam-tool
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description: helper command used in gleam2nix builds
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---
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<!--
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SPDX-FileCopyrightText: 2025 Ruby Iris Juric <ruby@srxl.me>
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SPDX-License-Identifier: 0BSD
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-->
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:::danger
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this is an internal command used during nix builds, and is probably not meant to be used outside of them!
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:::
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`gleam-tool` provides some functionality to generate some supporting files required by compiled gleam projects, that would otherwise be created through normal use of commands like `gleam build`.
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## subcommands
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### `appspec`
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```shellsession
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$ gleam-tool appspec [out_path] [otp_dependencies]...
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```
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generates an [application specification](https://www.erlang.org/doc/apps/kernel/app) for a gleam project.
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- `out_path`: where to write the generated specification to
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- `otp_dependencies` (optional): space-separated list of otp applications name that the specification should declare a dependency on
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### `entrypoint`
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```shellsession
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$ gleam-tool entrypoint
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```
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generates and compiles an erlang module used as the entrypoint for running applications built by [`buildGleamApplication`](../buildgleamapplication). the final compiled module is output to `gleam_entrypoint.beam` in the current directory.