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chore: add simple readme for generator
Fixes: googleapis#2626
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# google-api-go-generator | ||
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This package is the discovery client generator for Go. It is used to generate | ||
all of the client libraries in this repository | ||
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## Flags | ||
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- `api` (`string`): The API ID to generate, like 'tasks:v1'. A value of `*` means | ||
all. (default "*") | ||
- `api_json_file` (`string`): If non-empty, the path to a local file on disk | ||
containing the API to generate. Exclusive with setting --api. | ||
- `api_pkg_base` (`string`):Go package prefix to use for all generated APIs. | ||
(default "google.golang.org/api") | ||
- `base_url` (`string`): (optional) Override the default service API URL. If empty, | ||
the service's root URL will be used. | ||
- `build` (`bool`): Compile generated packages. | ||
- `cache` (`bool`): Use cache of discovered Google API discovery documents. | ||
(default true) | ||
- `copyright_year` (`string`): Year for copyright. (default "2024") | ||
- `discoveryurl` (`string`): URL to root discovery document (default | ||
"www.googleapis.com/discovery/v1/apis") | ||
- `gendir` (`string`): Directory to use to write out generated Go files | ||
- `gensupport_pkg` (`string`): Go package path of the 'api/internal/gensupport' | ||
support package. (default "google.golang.org/api/internal/gensupport") | ||
- `googleapi_pkg` (`string`): Go package path of the 'api/googleapi' support | ||
package. (default "google.golang.org/api/googleapi") | ||
- `header_path` (`string`): If non-empty, prepend the contents of this file to | ||
generated services. | ||
- `htransport_pkg` (`string`): Go package path of the 'api/transport/http' support | ||
package. (default "google.golang.org/api/transport/http") | ||
- `install` (`bool`): Install generated packages. | ||
- `internal_pkg` (`string`): Go package path of the 'internal' support package. | ||
(default "google.golang.org/api/internal") | ||
- `internaloption_pkg` (`string`): Go package path of the | ||
'api/option/internaloption' support package. (default | ||
"google.golang.org/api/option/internaloption") | ||
- `option_pkg` (`string`): Go package path of the 'api/option' support package. | ||
(default "google.golang.org/api/option") | ||
- `output` (`string`): (optional) Path to source output file. If not specified, | ||
the API name and version are used to construct an output path (e.g. tasks/v1). | ||
- `publiconly` (`bool`): Only build public, released APIs. Only applicable for | ||
Google employees. (default true) | ||
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## Automated usage | ||
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This generator runs daily via the automated bash script: | ||
[discogen.sh](../internal/kokoro/discogen.sh). | ||
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## Example local usage | ||
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### Run same command the automation uses | ||
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`make all` | ||
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### Generate a client from a local discovery document | ||
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`go build -o google-api-go-generator && ./google-api-go-generator -cache=true -install -api_json_file=/path/to/file` | ||
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### Refresh an existing client | ||
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`go build -o google-api-go-generator && ./google-api-go-generator -cache=false -install -api=sevicename:vsomething -gendir=..` |