Test post

This is a post to test features like code highlight and such.

Code highlight testing

From https://dev.to/renegadecoder94/fibonacci-in-every-language-1l46.

fib :: Integer -> Integer
fib 0 = 0
fib 1 = 1
fib n = fib (n-1) + fib (n-2)

import math
from decimal import Decimal, getcontext

getcontext().prec = 1000
ONE = Decimal(1)
SQRT_FIVE = Decimal(5).sqrt()
HALF = Decimal(0.5)
PHI = (ONE + SQRT_FIVE) * HALF


def fibonacci(n):
    if n == 0:
        return 0
    return math.floor((PHI ** n) / SQRT_FIVE + HALF)

package main

import (
    "fmt"
    "os"
    "strconv"
)

func fib(n int) {
    a, b := 0, 1
    for i := 0; i < n; i++ {
        a, b = b, a+b
        fmt.Printf("%d: %d\n", i+1, a)
    }
}

const msg = "Usage: please input the count of fibonacci numbers to output"

func main() {
    if len(os.Args) == 1 {
        fmt.Println(msg)
        return
    }
    if os.Args[1] == "" {
        fmt.Println(msg)
        return
    }
    n, err := strconv.Atoi(os.Args[1])
    if err != nil {
        fmt.Println(msg)
        return
    }
    fib(n)
}

function fib(i){ 
    if (i<=0) return -1;
    else if (i==1) return 1;
    else if (i==2) return 1;
    else return fib(i-1)+fib(i-2)
}

// some examples
//fib(3) returns 2
//fib(5) returns 5

Bash double bracket fix

Currently, weblog has issues rendering [[ inside code blocks. The issue is described here: https://discourse.lol/t/page-link-markdown-rendering-inside-code-block/780/2.

# ...
if ! [[ -f "$DB_FILE" ]]; then
# ...
fi

Mermaid

Mermaid graphs should be rendered instead of highlighting the mermaid code itself

%%{init: {"flowchart": {"htmlLabels": false}} }%%
flowchart LR
    markdown["`This **is** _Markdown_`"]
    newLines["`Line1
    Line 2
    Line 3`"]
    markdown --> newLines

sequenceDiagram
    Alice->>John: Hello John, how are you?
    John-->>Alice: Great!
    Alice-)John: See you later!

---
title: Animal example
---
classDiagram
    note "From Duck till Zebra"
    Animal <|-- Duck
    note for Duck "can fly\ncan swim\ncan dive\ncan help in debugging"
    Animal <|-- Fish
    Animal <|-- Zebra
    Animal : +int age
    Animal : +String gender
    Animal: +isMammal()
    Animal: +mate()
    class Duck{
        +String beakColor
        +swim()
        +quack()
    }
    class Fish{
        -int sizeInFeet
        -canEat()
    }
    class Zebra{
        +bool is_wild
        +run()
    }

Easier images from github

This feature should rewrite image tags when synchronizing articles to weblog. I should only have to write relative paths to github, but when sending to weblog they should be rewritten with the full URL, thus working on both platforms without me having to commit the full URL.

I write therefore:

![test-image](/images/test-image.jpg)<!--- this comment disables the rewrite feature -->

And weblog should see:

![test-image](https://raw.githubusercontent.com/gchamon/xd1.dev/images/test-image.jpg)

The following is the test image: