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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2026-01-12T13:25:15.836Z","updated_at":"2026-01-12T13:25:16.488Z","avatar_url":"https://github.com/csmith.png","language":"Go","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Yet another `envflag` library\n\n[![PkgGoDev](https://pkg.go.dev/badge/github.com/csmith/envflag)](https://pkg.go.dev/github.com/csmith/envflag/v2)\n\nThis is a simple library that allows that enables reading the value of flags from environment variables.\n\n## Why?\n\nThe Go flags package is well-thought-out, battle-tested, and extensively used, but modern\n[deployment practices](https://12factor.net/config) tend to favour storing configuration in environment variables rather\nthan passing them in on the command-line.\n\n`envflag` and its predecessors bridge this gap by mapping environment variables onto flags.\n\n## How?\n\nImport this package, and use `envflag.Parse` instead of `flag.Parse`:\n\n```go\npackage main\n\nimport (\n\t\"flag\"\n\n\t\"github.com/csmith/envflag/v2\"\n)\n\nvar (\n\tmyFlag = flag.String(\"my-flag\", \"woohoo\", \"Something or other\")\n)\n\nfunc main() {\n\tenvflag.Parse()\n\n\tprintln(*myFlag)\n}\n```\n\n## What?\n\nIn its default configuration, `envflag` will:\n\n* Map all flag names to appropriate environment variable names (`my-flag` -\u003e `MY_FLAG`)\n* Update the usage information of flags to include the environment variable name\n* Show usage and exit with an appropriate status code on error\n* Use the default set of flags provided by `flag.CommandLine`\n* Call `flag.Parse` to also parse any command-line flags\n\nYou can customise the behaviour of `envflag` by passing in options:\n\n### Prefix all environment variables\n\n```go\nenvflag.Parse(envflag.WithPrefix(\"MYAPP_\"))\n```\n\nChanges the mapping of environment variables to always include the given prefix\n(e.g. `my-flag` -\u003e `MYAPP_MY_FLAG`).\n\n### Use a different flag set\n\n```go\nenvflag.Parse(envflag.WithFlagSet(someFlagSet))\n```\n\nUse the given `flag.FlagSet` instead of `flag.CommandLine`.\n\n### Don't show environment variable names in usage\n\n```go\nenvflag.Parse(envflag.WithShowInUsage(false))\n```\n\nSuppresses the default behaviour of updating flag usage to include the environment variable names.\n\n### Use a different set of arguments\n\n```go\nenvflag.Parse(envflag.WithArguments([]string{\"-option1\", \"-option2\"}))\n```\n\nWhen parsing the command-line arguments, use the given slice instead of `os.Args[1:]`.\n\n## Licence/credits/contributions etc\n\nReleased under the MIT licence. See LICENCE for full details.\n\nHeavily inspired by [kouhin/envflag](https://github.com/kouhin/envflag) which does\nmostly the same job but can't easily add prefixes and is a bit harder to configure.\n\nContributions are welcome! Please feel free to open issues or send pull requests.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcsmith%2Fenvflag","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcsmith%2Fenvflag","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcsmith%2Fenvflag/lists"}