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WIP Improve grdcall.c string breaking #5972

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WIP Improve grdcall.c string breaking #5972

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PaulWessel
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Description of proposed changes

I changed the quote checking to look for single quotes instead. This keeps the quoted args to -a_srs as one item, but something is still not quite right. Perhaps you know what to do next so you can add to this branch:

gmt grdgdal t.jpg -Atranslate -Gnew.tiff -F"-mo TIFFTAG_XRESOLUTION=300 -mo TIFFTAG_YRESOLUTION=300 -a_srs '+proj=stere +lat_0=90 +lon_0=35 +k=0.9996 +x_0=0 +y_0=0 +units=m +a=6378137.000 +b=6356752.314 +ellps=WGS84 +datum=WGS84 +units=m +no_defs' -co COMPRESS=LZW -co TILED=YES"  -M
ERROR 1: PROJ: proj_create: unrecognized format / unknown name
ERROR 1: Failed to process SRS definition: '+proj=stere +lat_0=90 +lon_0=35 +k=0.9996 +x_0=0 +y_0=0 +units=m +a=6378137.000 +b=6356752.314 +ellps=WGS84 +datum=WGS84 +units=m +no_defs'

@PaulWessel
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Any thoughts on this, @joa-quim ? We also call gdal_translate in grdcut to write a multi-band TIFF and there we don't need --a_srs so perhaps it might be easier to get grdgdal to do that job? I like the idea of avoiding system calls.

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In the single quotes case when '+proj=stere +lat_0=90' becomes '+proj=stere_+lat_0=90' shouldn't we get rid of the ' too? Otherwise they are passed verbatim to GDAL encapsulating the proj string.

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That may be the problem. I could try that. meanwhile see #5983 .

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See if this works for you.

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Looks like the single quote recipe is for *nix only. The Patagonia example fails

gmt coast -JS-55/-60/15c -R-77/-55/-57.5/-48r -Di -Gred -Bg2 --MAP_FRAME_TYPE=inside -ps patagonia
psconvert patagonia.ps -Tt -W+g -V

...
psconvert [INFORMATION]: Proj4 definition: +proj=stere +lat_0=-60 +lon_0=-55 +k=0.9996 +x_0=0 +y_0=0 +units=m +a=6378137.000 +b=6356752.314 +ellps=WGS84 +datum=WGS84 +units=m +no_defs
psconvert [INFORMATION]: The grdgdal command:
"patagonia.tif" -Atranslate -M -G"patagonia.tiff" -F"-mo TIFFTAG_XRESOLUTION=300 -mo TIFFTAG_YRESOLUTION=300 -a_srs "+proj=stere +lat_0=-60 +lon_0=-55 +k=0.9996 +x_0=0 +y_0=0 +units=m +a=6378137.000 +b=6356752.314 +ellps=WGS84 +datum=WGS84 +units=m +no_defs" -co COMPRESS=LZW -co TILED=YES"
grdgdal [ERROR]: Cannot find file +lat_0
grdgdal [ERROR]: Cannot find file +lat_0
grdgdal [ERROR]: Cannot find file +lon_0
grdgdal [ERROR]: Cannot find file +lon_0
grdgdal [ERROR]: Cannot find file +k
...

@PaulWessel
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PaulWessel commented Nov 12, 2021 via email

@joa-quim
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This doesn't work for you either. Shit happens earlier at create options. The proj string was already broken into pieces.

image

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Create_Options are concerned with stuff like -BWesn+t"My title" -Bxa5+l"Some label" I think. However, when grdgdal.c was added, it actually expects a -Margs option where the args are in double quotes and may contains sub-options in single quotes. Is this a correct description of life?

If so, yes, then Create_Option needs to be smarter or grdgdal needs to intervene somehow. But first, let me know if the above is correct.

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It's not -M, is -F

List of GDAL options for the selected program in -A wrapped in double quotes.

From this, I assume yes. But no single quotes, only double. Or if *nix insists all singles on *nix and all doubles on Win.

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So on Windows, if you want to pass a series of options via -F, you need to quote the whole string, but if there are the -a_srs suboptions, you cannot also use double quotes for those, are you? Don't you do

-F"-mo TIFFTAG_XRESOLUTION=300 -a_srs '+proj=stere +lat_0=-60 +lon_0=-55 +k=0.9996'"

?

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I think this is a not anticipated case. We need to be able to break up the -F string in tokens and the +proj=... is one of them. In -J we let it be "+proj=stere +lat_0=-60 +lon_0=-55 +k=0.9996" or "+proj=stere+lat_0=-60+lon_0=-55+k=0.9996" (no spaces). One solution would be to do the same, that is, no spaces and then we introduce them. A simpler one seems to be to wrap the +proj4 in single quotes. But this is OS dependent. Would work in present case because the command is generated in psconvert but not in the general case where the shells sneak in to f things.

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Thanks, forgot about how the +proj stuff was handed: We expect no spaces and then they are added in the J internal strings passed out. Seems like we just need to remove them before passing to the next gmt module.

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We should revisit this after 6.3 has been released to see if we can eliminate gdal_translate calls in psconvert and grdcut.

@PaulWessel PaulWessel added this to the Future release milestone Nov 18, 2021
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