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package config
// Append appends one configuration to another.
//
// Append assumes that both configurations will not have
// conflicting variables, resources, etc. If they do, the
// problems will be caught in the validation phase.
//
// It is possible that c1, c2 on their own are not valid. For
// example, a resource in c2 may reference a variable in c1. But
// together, they would be valid.
func Append(c1, c2 *Config) (*Config, error) {
c := new(Config)
// Append unknown keys, but keep them unique since it is a set
unknowns := make(map[string]struct{})
for _, k := range c1.unknownKeys {
_, present := unknowns[k]
if !present {
unknowns[k] = struct{}{}
c.unknownKeys = append(c.unknownKeys, k)
}
}
for _, k := range c2.unknownKeys {
_, present := unknowns[k]
if !present {
unknowns[k] = struct{}{}
c.unknownKeys = append(c.unknownKeys, k)
}
}
c.Atlas = c1.Atlas
if c2.Atlas != nil {
c.Atlas = c2.Atlas
}
// merge Terraform blocks
if c1.Terraform != nil {
c.Terraform = c1.Terraform
if c2.Terraform != nil {
c.Terraform.Merge(c2.Terraform)
}
} else {
c.Terraform = c2.Terraform
}
if len(c1.Modules) > 0 || len(c2.Modules) > 0 {
c.Modules = make(
[]*Module, 0, len(c1.Modules)+len(c2.Modules))
c.Modules = append(c.Modules, c1.Modules...)
c.Modules = append(c.Modules, c2.Modules...)
}
if len(c1.Outputs) > 0 || len(c2.Outputs) > 0 {
c.Outputs = make(
[]*Output, 0, len(c1.Outputs)+len(c2.Outputs))
c.Outputs = append(c.Outputs, c1.Outputs...)
c.Outputs = append(c.Outputs, c2.Outputs...)
}
if len(c1.ProviderConfigs) > 0 || len(c2.ProviderConfigs) > 0 {
c.ProviderConfigs = make(
[]*ProviderConfig,
0, len(c1.ProviderConfigs)+len(c2.ProviderConfigs))
c.ProviderConfigs = append(c.ProviderConfigs, c1.ProviderConfigs...)
c.ProviderConfigs = append(c.ProviderConfigs, c2.ProviderConfigs...)
}
if len(c1.Resources) > 0 || len(c2.Resources) > 0 {
c.Resources = make(
[]*Resource,
0, len(c1.Resources)+len(c2.Resources))
c.Resources = append(c.Resources, c1.Resources...)
c.Resources = append(c.Resources, c2.Resources...)
}
if len(c1.Variables) > 0 || len(c2.Variables) > 0 {
c.Variables = make(
[]*Variable, 0, len(c1.Variables)+len(c2.Variables))
c.Variables = append(c.Variables, c1.Variables...)
c.Variables = append(c.Variables, c2.Variables...)
}
return c, nil
}
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