Sending ascii characters through system or dos command

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Jan Loof
Jan Loof 2020-9-9
回答： Walter Roberson 2020-9-9
I'd like to send a system command to obtain the commit of a git tag, I'm trying to do this using the git rev-parse functionality:
cmd = 'git rev-parse v1.3^{}'
[resp,cmdOut] = system(cmd)
Gives me the response:
resp =
128
cmdOut =
'v1.3{}
fatal: ambiguous argument 'v1.3{}': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
'
The ^ character does not arrive in the shell. I tested this by:
cmd = 'echo git rev-parse v1.3^{}'
[resp,cmdOut] = system(cmd)
which gives me
resp =
0
cmdOut =
'git rev-parse v1.3{}
'
I'm on a windows computer. I tried the same yesterday in octave online (https://octave-online.net/) which does give me the expected respone. I do think that octave online runs linux though.
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Rik
Rik 2020-9-9
That works on my system (W8+R2020a), so feel free to move that to the answer section.

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采纳的回答

Walter Roberson
Walter Roberson 2020-9-9
Hmmm, maybe
cmd = 'echo git rev-parse v1.3^^{}'
(I am not using Windows so I cannot easily test myself.)

更多回答（1 个）

Rik
Rik 2020-9-9
If you don't find a real solution: you can write the command to a bat file and run that instead. You can use the > symbol to redirect the output to a plain text file, which you can then read back.
You might want to use tempname to generate file names in the temp folder of the system running your function. That way you have the best chance of write access.
  2 个评论
Jan Loof
Jan Loof 2020-9-9
I did find a solution by doing this:
function [tag,currentCommit] = getGitTag(folder)
%GETGITTAG Gets the git tag and commit for a given folder. When the current
%commit has no tag, the commit hash is also the tag.
if ~isfolder(folder)
error('%s does not exist',folder)
end
% Save the startdir
startDir = pwd;
% Go to folder
cd(folder)
% Get the current commit:
[resp,cmdOut] = system('git rev-parse HEAD');
if resp==0
commitList = split(cmdOut,newline);
% Remove the empty commits:
commitList(cellfun(@isempty,commitList)) = [];
% Select the first one:
currentCommit = commitList{1};
else
error('Could not get current commit because %s', cmdOut)
end
% Get the tag:
[resp,cmdOut] = system(['git tag --points-at ' currentCommit]);
if resp==0
% Split the tags into a list:
tagList = split(cmdOut,newline);
% Remove the empty tags:
tagList(cellfun(@isempty,tagList)) = [];
if ~isempty(tagList)
% Assign the tag when it is there:
tag = tagList{1};
else
% Otherwise assign the commit hash:
warning('Using commit %s as a tag because the current commit has no tag',currentCommit);
tag = currentCommit;
end
else
error('Could not get current commit because %s', cmdOut)
end
% Go back to the start dir:
cd(startDir)
end
In this way i turn the problem arround and I can avoid the "weird" character. I'm just wondering why I cannot pass a ^ into the shell..
Rik
Rik 2020-9-9
Maybe you need to escape it in some way. I'm on mobile so I can't test it for you.

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