bash image-magick：如果程式呼叫內部的條件-有解無憂

我的 bash 腳本呼叫 Image-magic 的 convert 實用程式，根據提供的條件將幾種型別的輸入影像堆疊在一起：

if [ "$DETAILS" == 1 ]; then
#stack 3 types of images in vertical row
convert \( "${output}/${target}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \) \( "${output}/${dist}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \) \( "${output}/${angl}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \) -bordercolor lightgoldenrod2 -border 2x0  append -background white -alpha deactivate ${output}/HBONDS-summary.png
else
   #stack 1 type of images in vertical row
convert \( "${output}/${target}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \) -bordercolor lightgoldenrod2 -border 2x0  append -background white -alpha deactivate ${output}/HBONDS-summary.png
fi

由于兩個選項之間的差異只是塊的數量

\( .. \)

為轉換提供，是否可以將 IF 條件放在轉換內部以簡化腳本，例如這可能是錯誤的 bash 語法，但總體思路可能是：

 # Add two more blocks with ${dist} and ${angl} images if we match the condition:
convert \( "${output}/${target}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \) **!NB >>> if [ "$DETAILS" == 1 ];** then \( "${output}/${dist}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \) \( "${output}/${angl}*.png" **fi;** <<< -bordercolor lightgoldenrod2 -border 0x2 -append \) -bordercolor lightgoldenrod2 -border 2x0  append -background white -alpha deactivate ${output}/HBONDS-summary.png

uj5u.com熱心網友回復：

你可以這樣做：

convert_extra_args=()
if [ "$DETAILS" == 1 ]; then
  convert_extra_args=(
    \( "${output}/${dist}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \)
    \( "${output}/${angl}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \)
  )
fi

convert \( "${output}/${target}*.png" -bordercolor lightgoldenrod2 -border 0x2 -append \) "${convert_extra_args[@]}" -bordercolor lightgoldenrod2 -border 2x0  append -background white -alpha deactivate ${output}/HBONDS-summary.png

uj5u.com熱心網友回復：

@oguzismail 的解決方案對于構建一組復雜的選項和便于參考可能更簡潔，但我只是想展示另外兩種可能性。請注意，這些是bash-isms特定于 bash-like shell 的。

輸出紅色框，但如果 DETAILS 為 1，則添加藍色框：

DETAILS=0
magick -size 100x100 xc:red $( [ $DETAILS -eq 1 ] && echo "xc:blue  append" ) result.png

bash image-magick：如果程式呼叫內部的條件

和：

DETAILS=1
magick -size 100x100 xc:red $( [ $DETAILS -eq 1 ] && echo "xc:blue  append" ) result.png

bash image-magick：如果程式呼叫內部的條件

另一種可能：

DETAILS=""
printf "$DETAILS" | magick -size 100x100 xc:red $(cat) result.png

bash image-magick：如果程式呼叫內部的條件

和：

DETAILS="xc:blue xc:yellow  append"
printf "$DETAILS" | magick -size 100x100 xc:red $(cat) result.png

bash image-magick：如果程式呼叫內部的條件

轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/515843.html

標籤：重击if 语句图像魔术师

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