Updating README.md for chromedp-gen command
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Kenneth Shaw
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# About chromedp-gen
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# About chromedp-gen
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chromedp-gen is a standalone cli tool for the chromedp package that generates
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`chromedp-gen` is a standalone cli tool for the [chromedp](https://github.com/knq/chromedp)
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the types for the chrome domain APIs as defined in `protocol.json`.
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package that generates the types for the chrome domain APIs as defined in
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Chrome's `protocol.json`.
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# Updating
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## Updating protocol.json
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Run update.sh to retrieve and combine the latest `js_protocol.json` and
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Run [`update.sh`](update.sh) to retrieve and combine the latest
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`browser_protocol.json` into `protocol.json`.
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[`browser_protocol.json`](https://chromium.googlesource.com/chromium/src/+/master/third_party/WebKit/Source/core/inspector/browser_protocol.json) and
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[`js_protocol.json`](https://chromium.googlesource.com/v8/v8/+/master/src/inspector/js_protocol.json)
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from the [Chromium source tree](https://chromium.googlesource.com/) into [`protocol.json`](protocol.json).
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# Running
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## Installing quicktemplate and easyjson
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`chromedp-gen` uses [quicktemplate](https://github.com/valyala/quicktemplate) for
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code generation templates, and uses [easyjson](https://github.com/mailru/easyjson)
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for JSON marshaling/unmarshaling.
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Unfortunately, both of these projects cannot be used directly out of the box,
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as the versions used by `chromedp-gen` make use of a couple minor modifications:
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1. quicktemplate has been modified to recognize '{% end %}' templates
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2. easyjson has been modified to always output generated code in the same order
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(previously, the mailru version did not always generate the same output, as
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a couple points in the code were being affected by the Go map/key order
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issue).
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I ([kenshaw](https://github.com/kenshaw)) have put in issues/pull requests to
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both projects in the hope that the changes I've made get merged and/or fixed
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otherwise.
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For now, the exact versions that are in use with `chromedp-gen` can be obtained
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on my personal Github account:
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* [github.com/kenshaw/quicktemplate](https://github.com/kenshaw/quicktemplate)
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* [github.com/kenshaw/easyjson](https://github.com/kenshaw/easyjson)
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The commands (and their associated dependencies) can be installed in the usual
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Go way:
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```sh
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go get -u github.com/kenshaw/quicktemplate/qtc github.com/kenshaw/easyjson/easyjson
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```
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Each package provides a command (`qtc` and `easyjson`, respectively) that need
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to be available on the path for the `chromedp-gen` command to work.
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## Generating types for chromedp
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Assuming the `qtc` and `easyjson` commands are available (see above), one can
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then run the [`build.sh`](build.sh) which will handle generating template
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files, and building/invoking the `chromedp-gen` command.
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## Reference Output
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The output of running `update.sh` and `build.sh` is below:
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```sh
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ken@ken-desktop:~/src/go/src/github.com/knq/chromedp/cmd/chromedp-gen$ ./update.sh
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# download
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curl -s $BROWSER_PROTO | base64 -d > $BROWSER_TMP
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curl -s $JS_PROTO | base64 -d > $JS_TMP
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# merge browser_protocol.json and js_protocol.json
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jq -s '[.[] | to_entries] | flatten | reduce .[] as $dot ({}; .[$dot.key] += $dot.value)' $BROWSER_TMP $JS_TMP > $OUT
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# convert boolean values listed as strings to real booleans
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# (this is not used in favor of using the custom Bool type that correctly JSON unmarshals the value)
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# left here for completeness
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#perl -pi -e 's/"\s*:\s*"(true|false)"/": \1/g' $OUT
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ken@ken-desktop:~/src/go/src/github.com/knq/chromedp/cmd/chromedp-gen$ ./build.sh
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go generate
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qtc: 2017/01/29 09:10:16 Compiling *.qtpl template files in directory "templates"
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qtc: 2017/01/29 09:10:16 Compiling "templates/domain.qtpl" to "templates/domain.qtpl.go"...
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qtc: 2017/01/29 09:10:16 Compiling "templates/extra.qtpl" to "templates/extra.qtpl.go"...
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qtc: 2017/01/29 09:10:16 Compiling "templates/file.qtpl" to "templates/file.qtpl.go"...
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qtc: 2017/01/29 09:10:16 Compiling "templates/type.qtpl" to "templates/type.qtpl.go"...
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qtc: 2017/01/29 09:10:16 Total files compiled: 4
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go build
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time ./chromedp-gen
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2017/01/29 09:10:17 skipping command Page.getCookies [redirect:Network]
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2017/01/29 09:10:17 skipping command Page.deleteCookie [redirect:Network]
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2017/01/29 09:10:17 skipping command Page.setDeviceMetricsOverride [redirect:Emulation]
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2017/01/29 09:10:17 skipping command Page.clearDeviceMetricsOverride [redirect:Emulation]
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2017/01/29 09:10:17 skipping command Page.setGeolocationOverride [redirect:Emulation]
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2017/01/29 09:10:17 skipping command Page.clearGeolocationOverride [redirect:Emulation]
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2017/01/29 09:10:17 skipping command Page.setDeviceOrientationOverride [redirect:DeviceOrientation]
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2017/01/29 09:10:17 skipping command Page.clearDeviceOrientationOverride [redirect:DeviceOrientation]
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2017/01/29 09:10:17 skipping command Page.setTouchEmulationEnabled [redirect:Emulation]
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2017/01/29 09:10:17 skipping command param Emulation.setDeviceMetricsOverride.offsetX [deprecated]
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2017/01/29 09:10:17 skipping command param Emulation.setDeviceMetricsOverride.offsetY [deprecated]
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2017/01/29 09:10:17 skipping command param Tracing.start.categories [deprecated]
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2017/01/29 09:10:17 skipping command param Tracing.start.options [deprecated]
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2017/01/29 09:10:17 skipping domain Console (console) [deprecated]
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2017/01/29 09:10:17 running goimports
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2017/01/29 09:10:31 running easyjson (stubs)
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2017/01/29 09:10:31 running easyjson
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2017/01/29 09:10:39 done.
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real 0m22.318s
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user 1m15.132s
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sys 0m53.592s
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go install ../../cdp/...
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ken@ken-desktop:~/src/go/src/github.com/knq/chromedp/cmd/chromedp-gen$
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```
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