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io.go
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package io
import (
"encoding/json"
"fmt"
htmlTemplate"html/template"
"os"
"path"
"strings"
"text/template"
"github.com/jojomi/tplfuncs"
"github.com/juju/errors"
"github.com/jojomi/io/input"
"github.com/jojomi/strtpl"
jsoniter"github.com/json-iterator/go"
"github.com/rs/zerolog/log"
"github.com/tidwall/sjson"
)
funcRenderFile(optsIOOpts)error {
data,outputData,err:=generateOutput(opts)
iferr!=nil {
log.Fatal().Err(err).Interface("opts",opts).Interface("data",data).Msg("failed to run")
}
// output to file
err=writeOutputFile(opts, []byte(outputData),data)
iferr!=nil {
log.Fatal().Err(err).Str("output filename",opts.OutputFilename).Msg("failed to write to output file")
}
returnnil
}
funcRenderString(optsIOOpts) (string,error) {
data,outputData,err:=generateOutput(opts)
iferr!=nil {
log.Fatal().Err(err).Interface("opts",opts).Interface("data",data).Msg("failed to run")
}
returnstring(outputData),err
}
// generateOutput generates the output content using the environment given. This is the workhorse inside io.
// It returns the inputData used and the template output bytes plus the error if one occurred.
funcgenerateOutput(optsIOOpts) (interface{}, []byte,error) {
inputData,err:=getDataFromInput(opts)
iferr!=nil {
returnnil,nil,errors.Annotatef(err,"failed to parse input %s",opts.Input)
}
templateContent,err:=getTemplateContent(opts,inputData)
iferr!=nil {
returnnil, []byte{},err
}
returngenerateOutputForTemplate(opts,inputData,templateContent)
}
funcgenerateOutputForTemplate(optsIOOpts,inputDatainterface{},templateData []byte) (interface{}, []byte,error) {
// handle overwrites
iflen(opts.Overwrites)>0 {
varjsonEncoder=jsoniter.ConfigCompatibleWithStandardLibrary
jsonBytes,err:=jsonEncoder.Marshal(inputData)
iferr!=nil {
returnnil,nil,errors.Annotate(err,"failed to marshal to JSON for overwriting")
}
for_,overwrite:=rangeopts.Overwrites {
key,value,ok:=strings.Cut(overwrite,"=")
if!ok {
// invalid format, must be key=value
continue
}
jsonBytes,err=sjson.SetBytes(jsonBytes,key,value)
iferr!=nil {
returnnil,nil,errors.Annotatef(err,"failed to apply overwrite %s (key=%s, value=%s)",overwrite,key,value)
}
}
err=json.Unmarshal(jsonBytes,&inputData)
iferr!=nil {
returnnil,nil,errors.Annotatef(err,"failed to re-unmarshal input %s",opts.Input)
}
}
outputData,err:=renderTemplate(opts,inputData,templateData)
iferr!=nil {
returnnil,nil,errors.Annotatef(err,"failed to render template %s",opts.TemplateFilename)
}
returninputData,outputData,nil
}
funcgetDataFromInput(optsIOOpts) (interface{},error) {
var (
datainterface{}
errerror
)
// inline JSON?
iflen(opts.Input)>0&&opts.Input[0:1]=="{" {
vardatamap[string]interface{}
err:=json.Unmarshal([]byte(opts.Input),&data)
iferr!=nil {
returnnil,fmt.Errorf("invalid inline json: %s",opts.Input)
}
returndata,nil
}
switchstrings.ToLower(path.Ext(opts.Input)) {
case".yml":
fallthrough
case".yaml":
data,err=input.GetYamlFromFile(opts.Input)
case".json":
data,err=input.GetJSONFromFile(opts.Input)
case".csv":
data,err=input.GetCSVFromFile(opts.Input)
}
iferr!=nil {
returnnil,err
}
returndata,nil
}
funcisHTML(optsIOOpts)bool {
returnstrings.ToLower(path.Ext(opts.OutputFilename))==".html"
}
funcgetTemplateContent(optsIOOpts,datainterface{}) ([]byte,error) {
// validate flags
ifopts.TemplateFilename!=""&&opts.TemplateInline!="" {
return []byte{},fmt.Errorf("both --template and --template-inline are set, pick one")
}
ifopts.TemplateFilename==""&&opts.TemplateInline=="" {
return []byte{},fmt.Errorf("neither --template nor --template-inline are set, set one")
}
// read template file
ifopts.TemplateFilename!="" {
filename,err:=strtpl.EvalWithFuncMap(opts.TemplateFilename,getTxtFuncMap(opts),data)
iferr!=nil {
return []byte{},err
}
returnos.ReadFile(filename)
}
return []byte(opts.TemplateInline),nil
}
funcrenderTemplate(optsIOOpts,datainterface{},templateData []byte) ([]byte,error) {
var (
resultstring
errerror
)
ifisHTML(opts) {
funcMap:=getHTMLFuncMap(opts)
result,err=strtpl.EvalHTMLWithFuncMap(string(templateData),funcMap,data)
}else {
funcMap:=getTxtFuncMap(opts)
result,err=strtpl.EvalWithFuncMap(string(templateData),funcMap,data)
}
iferr!=nil {
return []byte{},err
}
return []byte(result),nil
}
funcgetHTMLFuncMap(optsIOOpts) htmlTemplate.FuncMap {
returntplfuncs.MakeHTMLFuncMap(tplfuncs.ToHTMLFuncMap(getTxtFuncMap(opts)),tplfuncs.HTMLSafeHelpers())
}
funcgetTxtFuncMap(optsIOOpts) template.FuncMap {
maps:= []template.FuncMap{
tplfuncs.AssertHelpers(),
tplfuncs.CastHelpers(),
tplfuncs.ContainerHelpers(),
tplfuncs.DateHelpers(),
tplfuncs.DefaultHelpers(),
tplfuncs.EncodeHelpers(),
tplfuncs.GolangHelpers(),
tplfuncs.HashHelpers(),
tplfuncs.JSONHelpers(),
tplfuncs.LanguageHelpers(),
tplfuncs.LinesHelpers(),
tplfuncs.LoopHelpers(),
tplfuncs.MathHelpers(),
tplfuncs.PrintHelpers(),
tplfuncs.RandomHelpers(),
tplfuncs.SemverHelpers(),
tplfuncs.SpacingHelpers(),
tplfuncs.StringHelpers(),
tplfuncs.TypeConversionHelpers(),
tplfuncs.YAMLHelpers(),
}
ifopts.AllowExec {
maps=append(
maps,
tplfuncs.ExecHelpers(),
)
}
ifopts.AllowIO||opts.AllowExec {
maps=append(
maps,
tplfuncs.IOHelpers(),
tplfuncs.EnvHelpers(),
tplfuncs.FilesystemHelpers(),
)
}
ifopts.AllowNetwork||opts.AllowExec {
maps=append(
maps,
tplfuncs.NetworkHelpers(),
)
}
result:=tplfuncs.MakeFuncMap(maps...)
// io aware include function (with same data)
inlineTemplateFunc:=func(filenamestring) (string,error) {
inputData,err:=getDataFromInput(opts)
iferr!=nil {
return"",errors.Annotatef(err,"failed to parse input %s",opts.Input)
}
templateData,err:=os.ReadFile(filename)
iferr!=nil {
return"",errors.Annotatef(err,"failed to read include file at %s",filename)
}
_,out,err:=generateOutputForTemplate(opts,inputData,templateData)
returnstring(out),errors.Annotatef(err,"failed to render inlined template %s (no data)",filename)
}
inlineWithDataFunc:=func(filenamestring,data...interface{}) (string,error) {
var (
inputDatainterface{}
errerror
)
iflen(data)==1 {
inputData=data[0]
}else {
inputData,err=getMapFromParams(data)
iferr!=nil {
return"",errors.Annotatef(err,"failed to parse input from %v",data)
}
}
templateData,err:=os.ReadFile(filename)
iferr!=nil {
return"",errors.Annotatef(err,"failed to read include file at %s",filename)
}
_,out,err:=generateOutputForTemplate(opts,inputData,templateData)
returnstring(out),errors.Annotatef(err,"failed to render inlined template %s with data %v",filename,inputData)
}
result["inline"]=inlineTemplateFunc
result["includeIO"]=inlineTemplateFunc// for backward-compatibility only!
result["inlineIfExists"]=func(filenamestring) (string,error) {
if_,err:=os.Stat(filename);errors.Is(err,os.ErrNotExist) {
return"",nil
}
returninlineTemplateFunc(filename)
}
// TODO result["inlineRaw"] = ?
// add io aware include function (with explicitly given data)
result["inlineWithData"]=inlineWithDataFunc
result["inlineIfExistsWithData"]=func(filenamestring,data...interface{}) (string,error) {
if_,err:=os.Stat(filename);errors.Is(err,os.ErrNotExist) {
return"",nil
}
returninlineWithDataFunc(filename,data...)
}
returnresult
}
funcgetMapFromParams(data []interface{}) (map[string]interface{},error) {
result:=make(map[string]interface{})
varerrerror
fori:=0;i<len(data)-1;i=i+2 {
ifkey,ok:=data[i].(string);ok {
result[key]=data[i+1]
continue
}
iferr==nil {
err=fmt.Errorf("could not parse %v for config key (needs to be string)",data[i])
}
}
returnresult,err
}
funcwriteOutputFile(optsIOOpts,content []byte,datainterface{})error {
// no filename given -> stdout!
ifopts.OutputFilename=="" {
fmt.Println(string(content))
returnnil
}
// eval template on OutputFilename
filename,err:=strtpl.EvalWithFuncMap(opts.OutputFilename,getTxtFuncMap(opts),data)
iferr!=nil {
returnerrors.Annotatef(err,"could not evaluate output filename template: %s",opts.OutputFilename)
}
// make sure the target dir exists
err=os.MkdirAll(path.Dir(filename),os.FileMode(0750))
iferr!=nil {
returnerr
}
err=os.WriteFile(filename,content,os.FileMode(0640))
iferr!=nil {
returnerr
}
returnnil
}