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Cover image for Attempting to Learn Go - Ghost to Hugo 4
Steve Layton
Steve Layton

Posted on • Originally published at shindakun.dev on

Attempting to Learn Go - Ghost to Hugo 4

Intro

Here we are once again! If you missed the last couple of posts I suggest reading them first to get a feeling for how our little prototype has evolved. This time around we’re going to be doing some refactoring to clean up a bit. The majority of what we’ll be doing is adding methods to our β€œdatabase” struct.

The Method

What is a method? Well, you can think of it as a function that is attached to a struct. Or as A Tour of Go puts it

A method is a function with a special receiver argument.

In our code we have a struct GhostDatabase. We can add methods with the following signature where the receiver is our struct.

func (gd *GhostDatabase) getLength() int
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We could then call the method with the following

var db GhostDatabase

...load JSON code here...

length := db.getLength()
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OK so what’s our complete method look like? In the case of most of the methods we’ll be putting in place is pretty easy to reason about.

func (gd *GhostDatabase) getLength() int {
    return len(gd.Db[0].Data.Posts)
}
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Many Methods

Now lets quickly knock out some useful methods. For the most part they do what they say on the tin, so I won’t go into detail on each one.

func (gd *GhostDatabase) getMobiledoc(i int) string {
    return gd.Db[0].Data.Posts[i].Mobiledoc
}

func (gd *GhostDatabase) getPostId(i int) string {
    return gd.Db[0].Data.Posts[i].ID
}

func (gd *GhostDatabase) getPostTitle(i int) string {
    return gd.Db[0].Data.Posts[i].Title
}

func (gd *GhostDatabase) getPostSlug(i int) string {
    return gd.Db[0].Data.Posts[i].Slug
}

func (gd *GhostDatabase) getPostStatus(i int) string {
    return gd.Db[0].Data.Posts[i].Status
}

func (gd *GhostDatabase) getPostCreatedAt(i int) time.Time {
    return gd.Db[0].Data.Posts[i].CreatedAt
}

func (gd *GhostDatabase) getPostUpdatedAt(i int) time.Time {
    return gd.Db[0].Data.Posts[i].UpdatedAt
}

func (gd *GhostDatabase) getPostPublishedAt(i int) time.Time {
    return gd.Db[0].Data.Posts[i].PublishedAt
}

func (gd *GhostDatabase) getPostFeatureImage(i int) string {
    return gd.Db[0].Data.Posts[i].FeatureImage
}
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Tags

One thing that we haven’t looked into so far is retrieving the tags associated with a post. Since we’re working on adding methods now is a great time to work that out. Let’s talk through what we need to do.

First we need to loop through the β€œdatabase” of post tags. From here we check to see if the PostID field matches with the post ID, pid, we pass into the function. We then assign the tag ID to a variable, tagId.

Next we’ll loop our way though the Tags β€œdatabase” and check to see if the current tag id matches with tagId. If there is a match we append the tag name to a slice r. Once we’re done we return r.

Let’s see what that looks like in practice.

func (gd *GhostDatabase) getTags(pid string) []string {
    var r []string
    for i := 0; i < len(gd.Db[0].Data.PostsTags); i++ {
        if gd.Db[0].Data.PostsTags[i].PostID == pid {
            tagId := gd.Db[0].Data.PostsTags[i].TagID
            for j := 0; j < len(gd.Db[0].Data.Tags); j++ {
                if gd.Db[0].Data.Tags[j].ID == tagId {
                    r = append(r, gd.Db[0].Data.Tags[j].Name)
                }
            }
        }
    }
    return r
}
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Not to shabby.

Next Time

That’s all of our methods for now. With them out of the way I believe we have all the parts need to actually start writing our Markdown files!



Code Listing

package main

import (
    "encoding/json"
    "fmt"
    "io"
    "os"
    "reflect"
    "strconv"
    "strings"
    "time"
)

type GhostDatabase struct {
    Db []struct {
        Meta struct {
            ExportedOn int64 `json:"exported_on"`
            Version string `json:"version"`
        } `json:"meta"`
        Data struct {
            Posts []struct {
                ID string `json:"id"`
                UUID string `json:"uuid"`
                Title string `json:"title"`
                Slug string `json:"slug"`
                Mobiledoc string `json:"mobiledoc"`
                HTML string `json:"html"`
                CommentID string `json:"comment_id"`
                Plaintext string `json:"plaintext"`
                FeatureImage string `json:"feature_image"`
                Featured int `json:"featured"`
                Type string `json:"type"`
                Status string `json:"status"`
                Locale interface{} `json:"locale"`
                Visibility string `json:"visibility"`
                EmailRecipientFilter string `json:"email_recipient_filter"`
                AuthorID string `json:"author_id"`
                CreatedAt time.Time `json:"created_at"`
                UpdatedAt time.Time `json:"updated_at"`
                PublishedAt time.Time `json:"published_at"`
                CustomExcerpt interface{} `json:"custom_excerpt"`
                CodeinjectionHead interface{} `json:"codeinjection_head"`
                CodeinjectionFoot interface{} `json:"codeinjection_foot"`
                CustomTemplate interface{} `json:"custom_template"`
                CanonicalURL interface{} `json:"canonical_url"`
            } `json:"posts"`
            PostsAuthors []struct {
                ID string `json:"id"`
                PostID string `json:"post_id"`
                AuthorID string `json:"author_id"`
                SortOrder int `json:"sort_order"`
            } `json:"posts_authors"`
            PostsMeta []interface{} `json:"posts_meta"`
            PostsTags []struct {
                ID string `json:"id"`
                PostID string `json:"post_id"`
                TagID string `json:"tag_id"`
                SortOrder int `json:"sort_order"`
            } `json:"posts_tags"`
            Roles []struct {
                ID string `json:"id"`
                Name string `json:"name"`
                Description string `json:"description"`
                CreatedAt time.Time `json:"created_at"`
                UpdatedAt time.Time `json:"updated_at"`
            } `json:"roles"`
            RolesUsers []struct {
                ID string `json:"id"`
                RoleID string `json:"role_id"`
                UserID string `json:"user_id"`
            } `json:"roles_users"`
            Settings []struct {
                ID string `json:"id"`
                Group string `json:"group"`
                Key string `json:"key"`
                Value string `json:"value"`
                Type string `json:"type"`
                Flags interface{} `json:"flags"`
                CreatedAt time.Time `json:"created_at"`
                UpdatedAt time.Time `json:"updated_at"`
            } `json:"settings"`
            Tags []struct {
                ID string `json:"id"`
                Name string `json:"name"`
                Slug string `json:"slug"`
                Description interface{} `json:"description"`
                FeatureImage interface{} `json:"feature_image"`
                ParentID interface{} `json:"parent_id"`
                Visibility string `json:"visibility"`
                OgImage interface{} `json:"og_image"`
                OgTitle interface{} `json:"og_title"`
                OgDescription interface{} `json:"og_description"`
                TwitterImage interface{} `json:"twitter_image"`
                TwitterTitle interface{} `json:"twitter_title"`
                TwitterDescription interface{} `json:"twitter_description"`
                MetaTitle interface{} `json:"meta_title"`
                MetaDescription interface{} `json:"meta_description"`
                CodeinjectionHead interface{} `json:"codeinjection_head"`
                CodeinjectionFoot interface{} `json:"codeinjection_foot"`
                CanonicalURL interface{} `json:"canonical_url"`
                AccentColor interface{} `json:"accent_color"`
                CreatedAt time.Time `json:"created_at"`
                UpdatedAt time.Time `json:"updated_at"`
            } `json:"tags"`
            Users []struct {
                ID string `json:"id"`
                Name string `json:"name"`
                Slug string `json:"slug"`
                Password string `json:"password"`
                Email string `json:"email"`
                ProfileImage string `json:"profile_image"`
                CoverImage interface{} `json:"cover_image"`
                Bio interface{} `json:"bio"`
                Website interface{} `json:"website"`
                Location interface{} `json:"location"`
                Facebook interface{} `json:"facebook"`
                Twitter interface{} `json:"twitter"`
                Accessibility string `json:"accessibility"`
                Status string `json:"status"`
                Locale interface{} `json:"locale"`
                Visibility string `json:"visibility"`
                MetaTitle interface{} `json:"meta_title"`
                MetaDescription interface{} `json:"meta_description"`
                Tour interface{} `json:"tour"`
                LastSeen time.Time `json:"last_seen"`
                CreatedAt time.Time `json:"created_at"`
                UpdatedAt time.Time `json:"updated_at"`
            } `json:"users"`
        } `json:"data"`
    } `json:"db"`
}

type Mobiledoc struct {
    Version string `json:"version"`
    Markups []interface{} `json:"markups"`
    Atoms []interface{} `json:"atoms"`
    Cards [][]interface{} `json:"cards"`
    Sections [][]interface{} `json:"sections"`
    GhostVersion string `json:"ghostVersion"`
}

func (gd *GhostDatabase) getLength() int {
    return len(gd.Db[0].Data.Posts)
}

func (gd *GhostDatabase) getMobiledoc(i int) string {
    return gd.Db[0].Data.Posts[i].Mobiledoc
}

func (gd *GhostDatabase) getPostId(i int) string {
    return gd.Db[0].Data.Posts[i].ID
}

func (gd *GhostDatabase) getPostTitle(i int) string {
    return gd.Db[0].Data.Posts[i].Title
}

func (gd *GhostDatabase) getPostSlug(i int) string {
    return gd.Db[0].Data.Posts[i].Slug
}

func (gd *GhostDatabase) getPostStatus(i int) string {
    return gd.Db[0].Data.Posts[i].Status
}

func (gd *GhostDatabase) getPostCreatedAt(i int) time.Time {
    return gd.Db[0].Data.Posts[i].CreatedAt
}

func (gd *GhostDatabase) getPostUpdatedAt(i int) time.Time {
    return gd.Db[0].Data.Posts[i].UpdatedAt
}

func (gd *GhostDatabase) getPostPublishedAt(i int) time.Time {
    return gd.Db[0].Data.Posts[i].PublishedAt
}

func (gd *GhostDatabase) getPostFeatureImage(i int) string {
    return gd.Db[0].Data.Posts[i].FeatureImage
}

func (gd *GhostDatabase) getTags(pid string) []string {
    var r []string
    for i := 0; i < len(gd.Db[0].Data.PostsTags); i++ {
        if gd.Db[0].Data.PostsTags[i].PostID == pid {
            tagId := gd.Db[0].Data.PostsTags[i].TagID
            for j := 0; j < len(gd.Db[0].Data.Tags); j++ {
                if gd.Db[0].Data.Tags[j].ID == tagId {
                    r = append(r, gd.Db[0].Data.Tags[j].Name)
                }
            }
        }
    }
    return r
}

func main() {
    fmt.Println("ghost2hugo")

    file, err := os.Open("shindakun-dot-net.ghost.2022-03-18-22-02-58.json")
    if err != nil {
        fmt.Println(err)
    }

    defer file.Close()

    b, err := io.ReadAll(file)
    if err != nil {
        fmt.Println(err)
    }

    var db GhostDatabase

    err = json.Unmarshal(b, &db)
    if err != nil {
        fmt.Println(err)
    }

    for i := 0; i < db.getLength(); i++ {
        fmt.Println(db.getPostTitle(i))
        fmt.Println(db.getPostSlug(i))
        fmt.Println(db.getPostStatus(i))
        fmt.Println(db.getPostCreatedAt(i))
        fmt.Println(db.getPostUpdatedAt(i))
        fmt.Println(db.getPostPublishedAt(i))
        fmt.Println(db.getPostFeatureImage(i))

        id := db.getPostId(i)
        tags := db.getTags(id)
        fmt.Println(tags)

        c := strings.ReplaceAll(db.getMobiledoc(i), "`", "%'")
        cc := "`" + c + "`"

        ucn, err := strconv.Unquote(cc)
        if err != nil {
            fmt.Println(err, ucn)
        }

        ucn = strings.ReplaceAll(ucn, "%'", "`")

        var md Mobiledoc

        err = json.Unmarshal([]byte(ucn), &md)
        if err != nil {
            fmt.Println(err)
        }

        if reflect.ValueOf(md.Cards).Len() > 0 {
            card := md.Cards[0][1]
            bbb := card.(map[string]interface{})

            fmt.Println(bbb["markdown"])
        }

        fmt.Println("---")
    }
}
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