modernize: use fenced code blocks

1 files changed, 29 insertions, 11 deletions

diff --git a/USE.md b/USE.md
index 3e4cb3f..7b179ac 100644
--- a/USE.md
+++ b/USE.md
@@ -9,7 +9,9 @@ e.g. using "direct print" from a USB dongle
 on a Brother HL-4040CN Laser printer.
 A workaround is to [downgrade](#Downgrade) to PDF 1.2 like this:
 
-	ps2pdf12 infile outfile
+```shell
+ps2pdf12 infile outfile
+```
 
 ## Unsupported PDF data
 
@@ -21,11 +23,15 @@ e.g. using "direct print" from a USB dongle
 on a Brother HL-4040CN Laser printer.
 A workaround is to [refry](#Refry) like this:
 
-	pdf2ps infile - | ps2pdf12 - outfile
+```shell
+pdf2ps infile - | ps2pdf12 - outfile
+```
 
 or using this custom wrapper, where available:
 
-	localpdf2ps2pdf infile
+```shell
+localpdf2ps2pdf infile
+```
 
 If the above fails to work,
 then try replace `pdf2ps`
@@ -80,12 +86,16 @@ is technically a page with a /MediaBox of approx. [595 x 842 pt][page_dimensions
 
 Resolve all boxes (computing from defaults any omitted ones):
 
-	pdfinfo -box -l -1 input.pdf
+```shell
+pdfinfo -box -l -1 input.pdf
+```
 
 Extract MediaBox:
 
-	gs -dQUIET -dNODISPLAY -dNOSAFER -sFileName=input.pdf \
-	-c "FileName (r) file runpdfbegin 1 1 pdfpagecount {pdfgetpage /MediaBox get {=print ( ) print} forall (\n) print} for quit"
+```shell
+gs -dQUIET -dNODISPLAY -dNOSAFER -sFileName=input.pdf \
+-c "FileName (r) file runpdfbegin 1 1 pdfpagecount {pdfgetpage /MediaBox get {=print ( ) print} forall (\n) print} for quit"
+```
 
 To check if other boxes exist,
 replace `/MediaBox` with e.g. `/CropBox` in above command,
@@ -100,7 +110,9 @@ TODO: Add section on cropping, based on <https://stackoverflow.com/a/10418720/18
 
 Compute BoundingBox for each page individually (*not* across them all):
 
-	gs -q -dBATCH -dNOPAUSE -sDEVICE=bbox -dLastPage=1 input.pdf 2>&1 | grep %%BoundingBox
+```shell
+gs -q -dBATCH -dNOPAUSE -sDEVICE=bbox -dLastPage=1 input.pdf 2>&1 | grep %%BoundingBox
+```
 
 Source: <https://stackoverflow.com/a/52644056>
 
@@ -137,7 +149,9 @@ While the main purpose of plakativ is to not only resize
 but also slice onto multiple smaller tiles,
 one of its features is easy scaling by area.
 
-	plakativ --factor=0.5 --size=250mmx337mm --output=output.pdf input.pdf
+```shell
+plakativ --factor=0.5 --size=250mmx337mm --output=output.pdf input.pdf
+```
 
 ### using Ghostscript with fitPage
 
@@ -154,7 +168,9 @@ Example command,
 resizing from A3+ to A4
 (source width 910.24 and height 1258.9 as reported by `pdfinfo`):
 
-	gs -o output.pdf -sDEVICE=pdfwrite -dDEVICEWIDTHPOINTS=643.60333 -dDEVICEHEIGHTPOINTS=890.131 -dFIXEDMEDIA -dFitPage -dCompatibilityLevel=1.4 input.pdf
+```shell
+gs -o output.pdf -sDEVICE=pdfwrite -dDEVICEWIDTHPOINTS=643.60333 -dDEVICEHEIGHTPOINTS=890.131 -dFIXEDMEDIA -dFitPage -dCompatibilityLevel=1.4 input.pdf
+```
 
 TODO: maybe options `-dDEVICEWIDTHPOINTS` and `-dDEVICEHEIGHTPOINTS` can be shortened as `-dDEVICEWIDTH` and `-dDEVICEHEIGHT`
 
@@ -169,8 +185,10 @@ Example command,
 resizing from A4 to printable-area-A4
 (i.e. a dumb printer always auto-resizing to fit):
 
-	gs -o output.pdf -sDEVICE=pdfwrite -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -dFIXEDMEDIA -dCompatibilityLevel=1.4 \
-	-f input.pdf -c "<</EndPage {0 eq {[/CropBox [0 0 567 802] /PAGE pdfmark true}{false}ifelse}>> setpagedevice"
+```shell
+gs -o output.pdf -sDEVICE=pdfwrite -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -dFIXEDMEDIA -dCompatibilityLevel=1.4 \
+-f input.pdf -c "<</EndPage {0 eq {[/CropBox [0 0 567 802] /PAGE pdfmark true}{false}ifelse}>> setpagedevice"
+```
 
 NB! It is important to list option `-f` before `-c`,
 to ensure that any `CropBox` marks in file is [overridden] by the command.