Generate UnmarshalJSON to handle emptyStringInt types

This commit changes the code generator to generate a `UnmarshalJSON` for each
struct, so that if unmarshalled it properly handles UniFis varying integer values
via the `emptyStringInt` type.

Structs not including a field of `int` type will still have the function generated,
but it will effectively do nothing.

Fixes #18

unifi/channel_plan.generated.go

@@ -5,13 +5,15 @@ package unifi
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 )
 
 // just to fix compile issues with the import
 var (
-	_ fmt.Formatter
 	_ context.Context
+	_ fmt.Formatter
+	_ json.Marshaler
 )
 
 type ChannelPlan struct {
@@ -36,18 +38,74 @@ type ChannelPlan struct {
 	SiteBlacklistedChannels []ChannelPlanSiteBlacklistedChannels `json:"site_blacklisted_channels,omitempty"`
 }
 
+func (dst *ChannelPlan) UnmarshalJSON(b []byte) error {
+	type Alias ChannelPlan
+	aux := &struct {
+		*Alias
+	}{
+		Alias: (*Alias)(dst),
+	}
+
+	err := json.Unmarshal(b, &aux)
+	if err != nil {
+		return fmt.Errorf("unable to unmarshal alias: %w", err)
+	}
+
+	return nil
+}
+
 type ChannelPlanApBlacklistedChannels struct {
 	Channel   int    `json:"channel,omitempty"`   // 36|38|40|42|44|46|48|52|56|60|64|100|104|108|112|116|120|124|128|132|136|140|144|149|153|157|161|165|183|184|185|187|188|189|192|196
 	MAC       string `json:"mac,omitempty"`       // ^([0-9A-Fa-f]{2}:){5}([0-9A-Fa-f]{2})$
 	Timestamp int    `json:"timestamp,omitempty"` // [1-9][0-9]{12}
 }
 
+func (dst *ChannelPlanApBlacklistedChannels) UnmarshalJSON(b []byte) error {
+	type Alias ChannelPlanApBlacklistedChannels
+	aux := &struct {
+		Channel   emptyStringInt `json:"channel"`
+		Timestamp emptyStringInt `json:"timestamp"`
+
+		*Alias
+	}{
+		Alias: (*Alias)(dst),
+	}
+
+	err := json.Unmarshal(b, &aux)
+	if err != nil {
+		return fmt.Errorf("unable to unmarshal alias: %w", err)
+	}
+	dst.Channel = int(aux.Channel)
+	dst.Timestamp = int(aux.Timestamp)
+
+	return nil
+}
+
 type ChannelPlanCoupling struct {
 	Rssi   int    `json:"rssi,omitempty"`
 	Source string `json:"source,omitempty"` // ^([0-9A-Fa-f]{2}:){5}([0-9A-Fa-f]{2}).*$
 	Target string `json:"target,omitempty"` // ^([0-9A-Fa-f]{2}:){5}([0-9A-Fa-f]{2}).*$
 }
 
+func (dst *ChannelPlanCoupling) UnmarshalJSON(b []byte) error {
+	type Alias ChannelPlanCoupling
+	aux := &struct {
+		Rssi emptyStringInt `json:"rssi"`
+
+		*Alias
+	}{
+		Alias: (*Alias)(dst),
+	}
+
+	err := json.Unmarshal(b, &aux)
+	if err != nil {
+		return fmt.Errorf("unable to unmarshal alias: %w", err)
+	}
+	dst.Rssi = int(aux.Rssi)
+
+	return nil
+}
+
 type ChannelPlanRadioTable struct {
 	BackupChannel string `json:"backup_channel,omitempty"` // [0-9]|[1][0-4]|16|34|36|38|40|42|44|46|48|52|56|60|64|100|104|108|112|116|120|124|128|132|136|140|144|149|153|157|161|165|183|184|185|187|188|189|192|196|auto
 	Channel       string `json:"channel,omitempty"`        // [0-9]|[1][0-4]|16|34|36|38|40|42|44|46|48|52|56|60|64|100|104|108|112|116|120|124|128|132|136|140|144|149|153|157|161|165|183|184|185|187|188|189|192|196|auto
@@ -58,16 +116,72 @@ type ChannelPlanRadioTable struct {
 	Width         int    `json:"width,omitempty"`          // 20|40|80|160
 }
 
+func (dst *ChannelPlanRadioTable) UnmarshalJSON(b []byte) error {
+	type Alias ChannelPlanRadioTable
+	aux := &struct {
+		Width emptyStringInt `json:"width"`
+
+		*Alias
+	}{
+		Alias: (*Alias)(dst),
+	}
+
+	err := json.Unmarshal(b, &aux)
+	if err != nil {
+		return fmt.Errorf("unable to unmarshal alias: %w", err)
+	}
+	dst.Width = int(aux.Width)
+
+	return nil
+}
+
 type ChannelPlanSatisfactionTable struct {
 	DeviceMAC    string  `json:"device_mac,omitempty"` // ^([0-9A-Fa-f]{2}:){5}([0-9A-Fa-f]{2})$
 	Satisfaction float64 `json:"satisfaction,omitempty"`
 }
 
+func (dst *ChannelPlanSatisfactionTable) UnmarshalJSON(b []byte) error {
+	type Alias ChannelPlanSatisfactionTable
+	aux := &struct {
+		*Alias
+	}{
+		Alias: (*Alias)(dst),
+	}
+
+	err := json.Unmarshal(b, &aux)
+	if err != nil {
+		return fmt.Errorf("unable to unmarshal alias: %w", err)
+	}
+
+	return nil
+}
+
 type ChannelPlanSiteBlacklistedChannels struct {
 	Channel   int `json:"channel,omitempty"`   // 36|38|40|42|44|46|48|52|56|60|64|100|104|108|112|116|120|124|128|132|136|140|144|149|153|157|161|165|183|184|185|187|188|189|192|196
 	Timestamp int `json:"timestamp,omitempty"` // [1-9][0-9]{12}
 }
 
+func (dst *ChannelPlanSiteBlacklistedChannels) UnmarshalJSON(b []byte) error {
+	type Alias ChannelPlanSiteBlacklistedChannels
+	aux := &struct {
+		Channel   emptyStringInt `json:"channel"`
+		Timestamp emptyStringInt `json:"timestamp"`
+
+		*Alias
+	}{
+		Alias: (*Alias)(dst),
+	}
+
+	err := json.Unmarshal(b, &aux)
+	if err != nil {
+		return fmt.Errorf("unable to unmarshal alias: %w", err)
+	}
+	dst.Channel = int(aux.Channel)
+	dst.Timestamp = int(aux.Timestamp)
+
+	return nil
+}
+
 func (c *Client) listChannelPlan(ctx context.Context, site string) ([]ChannelPlan, error) {
 	var respBody struct {
 		Meta meta          `json:"meta"`