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I used 'M-x shell' to start a shell inside a buffer. Then I tried to run git diff
After I press the space bar a few time, the lines 29-69/69 line is printed a few and the shell has stopped responding.
Why it is the case? Is there anything to fix it?
EDIT
Did not see this error message when I used shell last time:
(I alias g to git)
Now I am not able to use git diff at all.
M-x shell is a dumb terminal, whereas it looks like the commands you're using expect a more fully-featured terminal. This is what the "WARNING: terminal is not fully functional" messages are about.
To circumvent the general issue, you could use a proper terminal emulator instead of shell-mode. Emacs has one built in: M-x term (or M-x ansi-term).
Note that git might just be wanting to invoke a pager. So another approach would be to tell git not to use paged output, via the GIT_PAGER environment variable, or the core.pager git config option.
You could test this in the shell like so:
git --no-pager diff
or using the environment variable:
GIT_PAGER=cat git diff
or configure it permanently:
git config core.pager cat
git diff
cat as the 'pager' for git like this, you may very well also wish to limit the number of lines of output for certain git commands, otherwise you may get a lot of output dumped into the buffer. e.g. git log provides an option to "Limit the number of commits to output." with can be specified with any of -<number>, -n <number>, --max-count=<number>
head (or a command which calls head with some custom max line-count argument) as your pager, instead of cat, and then use --no-pager in cases when you wish to disable that default limitation.
M-x shellor something else?M-x shellis a dumb terminal, whereas it looks like the commands you're using are wanting a more full-functional terminal. In this case, it might just be wanting to invoke a pager. You could set yourGIT_PAGERenvironment variable, or thecore.pagergit config option. Or else just use an actual terminal emulator instead ofshell-mode. Emacs has one built in:M-x term(oransi-term).M-x termis the answer. If you can post it as an answer to this question, i will accept it.