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https://github.com/fish-shell/fish-shell.git
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5282d3e711
This is part of an effort to improve fish's Unicode handling. This commit attempts to grapple with the fact that, certain characters (principally emoji) were considered to have a wcwidth of 1 in Unicode 8, but a width of 2 in Unicode 9. The system wcwidth() here cannot be trusted; terminal emulators do not respect it. iTerm2 even allows this to be set in preferences. This commit introduces a new function is_width_2_in_Uni9_but_1_in_Uni8() to detect characters of version-ambiguous width. For these characters, it returns a width guessed based on the value of TERM_PROGRAM and TERM_VERSION, defaulting to 1. This value can be overridden by setting the value of a new variable fish_emoji_width (presumably either to 1 or 2). Fixes #4539, #2652.
198 lines
6.8 KiB
C++
198 lines
6.8 KiB
C++
#ifndef FISH_FALLBACK_H
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#define FISH_FALLBACK_H
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#include "config.h"
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// IWYU likes to recommend adding <term.h> when we want <ncurses.h>. If we add <term.h> it breaks
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// compiling several modules that include this header because they use symbols which are defined as
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// macros in <term.h>.
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// IWYU pragma: no_include <term.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <unistd.h>
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// The following include must be kept despite what IWYU says. That's because of the interaction
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// between the weak linking of `wcsdup` and `wcscasecmp` via `#define`s below and the declarations
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// in <wchar.h>. At least on OS X if we don't do this we get compilation errors do to the macro
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// substitution if wchar.h is included after this header.
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#include <wchar.h> // IWYU pragma: keep
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/// The column width of emoji characters. This must be configurable because the value changed
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/// between Unicode 8 and Unicode 9, wcwidth() is emoji-ignorant, and terminal emulators do
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/// different things. See issues like #4539 and https://github.com/neovim/neovim/issues/4976 for how
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/// painful this is. A value of 0 means to use the guessed value.
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extern int g_fish_emoji_width;
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/// The guessed value of the emoji width based on TERM.
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extern int g_guessed_fish_emoji_width;
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/// fish's internal versions of wcwidth and wcswidth, which can use an internal implementation if
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/// the system one is busted.
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int fish_wcwidth(wchar_t wc);
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int fish_wcswidth(const wchar_t *str, size_t n);
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// Replacement for mkostemp(str, O_CLOEXEC)
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// This uses mkostemp if available,
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// otherwise it uses mkstemp followed by fcntl
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int fish_mkstemp_cloexec(char *);
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#ifndef WCHAR_MAX
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/// This _should_ be defined by wchar.h, but e.g. OpenBSD doesn't.
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#define WCHAR_MAX INT_MAX
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#endif
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/// Under curses, tputs expects an int (*func)(char) as its last parameter, but in ncurses, tputs
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/// expects a int (*func)(int) as its last parameter. tputs_arg_t is defined to always be what tputs
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/// expects. Hopefully.
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#ifdef NCURSES_VERSION
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typedef int tputs_arg_t;
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#else
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typedef char tputs_arg_t;
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#endif
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#ifndef HAVE_WINSIZE
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/// Structure used to get the size of a terminal window.
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struct winsize {
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/// Number of rows.
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unsigned short ws_row;
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/// Number of columns.
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unsigned short ws_col;
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};
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#endif
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#ifdef TPARM_SOLARIS_KLUDGE
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/// Solaris tparm has a set fixed of paramters in its curses implementation, work around this here.
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#define tparm tparm_solaris_kludge
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char *tparm_solaris_kludge(char *str, long p1 = 0, long p2 = 0, long p3 = 0, long p4 = 0,
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long p5 = 0, long p6 = 0, long p7 = 0, long p8 = 0, long p9 = 0);
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#endif
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/// On OS X, use weak linking for wcsdup and wcscasecmp. Weak linking allows you to call the
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/// function only if it exists at runtime. You can detect it by testing the function pointer against
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/// NULL. To avoid making the callers do that, redefine wcsdup to wcsdup_use_weak, and likewise with
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/// wcscasecmp. This lets us use the same binary on SnowLeopard (10.6) and Lion+ (10.7), even though
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/// these functions only exist on 10.7+.
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///
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/// On other platforms, use what's detected at build time.
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#if __APPLE__
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#if __DARWIN_C_LEVEL >= 200809L
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// We have to explicitly redeclare these as weak,
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// since we are forced to set the MIN_REQUIRED availability macro to 10.7
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// to use libc++, which in turn exposes these as strong
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wchar_t *wcsdup(const wchar_t *) __attribute__((weak_import));
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int wcscasecmp(const wchar_t *, const wchar_t *) __attribute__((weak_import));
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int wcsncasecmp(const wchar_t *, const wchar_t *, size_t n) __attribute__((weak_import));
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wchar_t *wcsdup_use_weak(const wchar_t *);
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int wcscasecmp_use_weak(const wchar_t *, const wchar_t *);
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int wcsncasecmp_use_weak(const wchar_t *s1, const wchar_t *s2, size_t n);
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#define wcsdup(a) wcsdup_use_weak((a))
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#define wcscasecmp(a, b) wcscasecmp_use_weak((a), (b))
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#define wcsncasecmp(a, b, c) wcsncasecmp_use_weak((a), (b), (c))
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#else
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wchar_t *wcsdup(const wchar_t *in);
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int wcscasecmp(const wchar_t *a, const wchar_t *b);
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int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n);
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wchar_t *wcsndup(const wchar_t *in, size_t c);
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#endif
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#else //__APPLE__
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/// These functions are missing from Solaris 10, and only accessible from
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/// Solaris 11 in the std:: namespace.
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#ifndef HAVE_WCSDUP
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#ifdef HAVE_STD__WCSDUP
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using std::wcsdup;
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#else
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wchar_t *wcsdup(const wchar_t *in);
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#endif // HAVE_STD__WCSDUP
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#endif // HAVE_WCSDUP
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#ifndef HAVE_WCSCASECMP
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#ifdef HAVE_STD__WCSCASECMP
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using std::wcscasecmp;
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#else
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int wcscasecmp(const wchar_t *a, const wchar_t *b);
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#endif // HAVE_STD__WCSCASECMP
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#endif // HAVE_WCSCASECMP
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#ifndef HAVE_WCSNCASECMP
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#ifdef HAVE_STD__WCSNCASECMP
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using std::wcsncasecmp;
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#else
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int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n);
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#endif // HAVE_STD__WCSNCASECMP
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#endif // HAVE_WCSNCASECMP
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#ifndef HAVE_DIRFD
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#ifndef __XOPEN_OR_POSIX
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#define dirfd(d) (d->dd_fd)
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#else
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#define dirfd(d) (d->d_fd)
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#endif
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#endif
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#endif
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#ifndef HAVE_WCSNDUP
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/// Fallback for wcsndup function. Returns a copy of \c in, truncated to a maximum length of \c c.
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wchar_t *wcsndup(const wchar_t *in, size_t c);
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#endif
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#ifndef HAVE_WCSLCPY
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/// Copy src to string dst of size siz. At most siz-1 characters will be copied. Always NUL
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/// terminates (unless siz == 0). Returns wcslen(src); if retval >= siz, truncation occurred.
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///
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/// This is the OpenBSD strlcpy function, modified for wide characters, and renamed to reflect this
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/// change.
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size_t wcslcpy(wchar_t *dst, const wchar_t *src, size_t siz);
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#endif
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#if 0
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// These are not currently used.
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#ifndef HAVE_LRAND48_R
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/// Data structure for the lrand48_r fallback implementation.
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struct drand48_data {
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unsigned int seed;
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};
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/// Fallback implementation of lrand48_r. Internally uses rand_r, so it is pretty weak.
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int lrand48_r(struct drand48_data *buffer, long int *result);
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/// Fallback implementation of srand48_r, the seed function for lrand48_r.
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int srand48_r(long int seedval, struct drand48_data *buffer);
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#endif
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#endif
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#ifndef HAVE_FUTIMES
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int futimes(int fd, const struct timeval *times);
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#endif
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// autoconf may fail to detect gettext (645), so don't define a function call gettext or we'll get
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// build errors.
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/// Cover for gettext().
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char *fish_gettext(const char *msgid);
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/// Cover for bindtextdomain().
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char *fish_bindtextdomain(const char *domainname, const char *dirname);
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/// Cover for textdomain().
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char *fish_textdomain(const char *domainname);
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#ifndef HAVE_KILLPG
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/// Send specified signal to specified process group.
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int killpg(int pgr, int sig);
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#endif
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#ifndef HAVE_FLOCK
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/// Fallback implementation of flock in terms of fcntl.
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/// Danger! The semantics of flock and fcntl locking are very different.
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/// Use with caution.
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int flock(int fd, int op);
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#define LOCK_SH 1 // Shared lock.
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#define LOCK_EX 2 // Exclusive lock.
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#define LOCK_UN 8 // Unlock.
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#define LOCK_NB 4 // Don't block when locking.
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#endif
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#endif
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