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os/shell: do_os_system(): Always show last chunk.

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This ameliorates use-cases like:
    :!cat foo.txt
    :make
where the user is interested in the last few lines of output.

Try these shell-based ex-commands before/after this commit:
    :grep -r '' *
    :make
    :!yes
    :!grep -r '' *
    :!git grep ''
    :!cat foo
    :!echo foo
    :!while true; do date; done
    :!for i in `seq 1 20000`; do echo XXXXXXXXXX $i; done

In all cases the last few lines of the command should always be shown,
regardless of where throttling was triggered.
This commit is contained in:
Justin M. Keyes
2016-10-07 13:18:24 +02:00
parent 97204e1cef
commit cb58999007
5 changed files with 141 additions and 82 deletions
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31
src/nvim/memory.c
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@@ -283,18 +283,16 @@ size_t memcnt(const void *data, char c, size_t len)
return cnt;
}
/// The xstpcpy() function shall copy the string pointed to by src (including
/// the terminating NUL character) into the array pointed to by dst.
/// Copies the string pointed to by src (including the terminating NUL
/// character) into the array pointed to by dst.
///
/// The xstpcpy() function shall return a pointer to the terminating NUL
/// character copied into the dst buffer. This is the only difference with
/// strcpy(), which returns dst.
/// @returns pointer to the terminating NUL char copied into the dst buffer.
/// This is the only difference with strcpy(), which returns dst.
///
/// WARNING: If copying takes place between objects that overlap, the behavior is
/// undefined.
/// WARNING: If copying takes place between objects that overlap, the behavior
/// is undefined.
///
/// This is the Neovim version of stpcpy(3) as defined in POSIX 2008. We
/// don't require that supported platforms implement POSIX 2008, so we
/// Nvim version of POSIX 2008 stpcpy(3). We do not require POSIX 2008, so
/// implement our own version.
///
/// @param dst
@@ -306,16 +304,15 @@ char *xstpcpy(char *restrict dst, const char *restrict src)
return (char *)memcpy(dst, src, len + 1) + len;
}
/// The xstpncpy() function shall copy not more than n bytes (bytes that follow
/// a NUL character are not copied) from the array pointed to by src to the
/// array pointed to by dst.
/// Copies not more than n bytes (bytes that follow a NUL character are not
/// copied) from the array pointed to by src to the array pointed to by dst.
///
/// If a NUL character is written to the destination, the xstpncpy() function
/// shall return the address of the first such NUL character. Otherwise, it
/// shall return &dst[maxlen].
/// If a NUL character is written to the destination, xstpncpy() returns the
/// address of the first such NUL character. Otherwise, it shall return
/// &dst[maxlen].
///
/// WARNING: If copying takes place between objects that overlap, the behavior is
/// undefined.
/// WARNING: If copying takes place between objects that overlap, the behavior
/// is undefined.
///
/// WARNING: xstpncpy will ALWAYS write maxlen bytes. If src is shorter than
/// maxlen, zeroes will be written to the remaining bytes.