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env.cpp: Simplify update_fish_color_support

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Taking advantage of the maybe_t's, the logic and nesting here
can be a bit less intense.

Small adjustments to debug output, and found a more accurate
version number for Lion Terminal.app.

Longer term we should have a terminal_t class or something
encapsulating all the kinds of terminal detection we have
with methods that return the color support, and also stuff
like whether the terminal has the newline glitch, the
ambiguous width character behavior, etc.
This commit is contained in:
Aaron Gyes 2019-02-12 01:32:06 -08:00
parent 43002f1822
commit bbc3fecbeb
1 changed files with 27 additions and 27 deletions
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54
src/env.cpp
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@ -464,51 +464,51 @@ static bool does_term_support_setting_title(const environment_t &vars) {
static void update_fish_color_support(const environment_t &vars) {
// Detect or infer term256 support. If fish_term256 is set, we respect it;
// otherwise infer it from the TERM variable or use terminfo.
auto fish_term256 = vars.get(L"fish_term256");
auto term_var = vars.get(L"TERM");
wcstring term = term_var.missing_or_empty() ? L"" : term_var->as_string();
bool support_term256 = false; // default to no support
if (!fish_term256.missing_or_empty()) {
wcstring term;
bool support_term256 = false;
bool support_term24bit = false;
if (auto term_var = vars.get(L"TERM")) term = term_var->as_string();
if (auto fish_term256 = vars.get(L"fish_term256")) {
// $fish_term256
support_term256 = bool_from_string(fish_term256->as_string());
debug(2, L"256 color support determined by 'fish_term256'");
debug(2, L"256 color support determined by '$fish_term256'");
} else if (term.find(L"256color") != wcstring::npos) {
// TERM=*256color*: Explicitly supported.
// TERM is *256color*: 256 colors explicitly supported
support_term256 = true;
debug(2, L"256 color support enabled for '256color' in TERM");
debug(2, L"256 color support enabled for TERM=%ls", term.c_str());
} else if (term.find(L"xterm") != wcstring::npos) {
// Assume that all xterms are 256, except for OS X SnowLeopard
const auto prog_var = vars.get(L"TERM_PROGRAM");
const auto progver_var = vars.get(L"TERM_PROGRAM_VERSION");
wcstring term_program = prog_var.missing_or_empty() ? L"" : prog_var->as_string();
if (term_program == L"Apple_Terminal" && !progver_var.missing_or_empty()) {
// OS X Lion is version 300+, it has 256 color support
if (strtod(wcs2str(progver_var->as_string()), NULL) > 300) {
// Assume that all 'xterm's can handle 256, except for Terminal.app from Snow Leopard
wcstring term_program, term_version;
if (auto tp = vars.get(L"TERM_PROGRAM")) term_program = tp->as_string();
if (auto tpv = vars.get(L"TERM_PROGRAM_VERSION")) {
if (term_program == L"Apple_Terminal" &&
fish_wcstod(tpv->as_string().c_str(), NULL) > 299) {
// OS X Lion is version 299+, it has 256 color support (see github Wiki)
support_term256 = true;
debug(2, L"256 color support enabled for TERM=xterm + modern Terminal.app");
debug(2, L"256 color support enabled for TERM=%ls on Terminal.app", term.c_str());
} else {
support_term256 = true;
debug(2, L"256 color support enabled for TERM=%ls", term.c_str());
}
} else {
support_term256 = true;
debug(2, L"256 color support enabled for TERM=xterm");
}
} else if (cur_term != NULL) {
// See if terminfo happens to identify 256 colors
support_term256 = (max_colors >= 256);
debug(2, L"256 color support: using %d colors per terminfo", max_colors);
} else {
debug(2, L"256 color support not enabled (yet)");
debug(2, L"256 color support: %d colors per terminfo entry for %ls", max_colors, term.c_str());
}
auto fish_term24bit = vars.get(L"fish_term24bit");
bool support_term24bit;
if (!fish_term24bit.missing_or_empty()) {
// Handle $fish_term24bit
if (auto fish_term24bit = vars.get(L"fish_term24bit")) {
support_term24bit = bool_from_string(fish_term24bit->as_string());
debug(2, L"'fish_term24bit' preference: 24-bit color %s",
support_term24bit ? L"enabled" : L"disabled");
} else {
// We don't attempt to infer term24 bit support yet.
support_term24bit = false;
// XXX: actually, we do, in config.fish.
// So we actually change the color mode shortly after startup
}
color_support_t support = (support_term256 ? color_support_term256 : 0) |
(support_term24bit ? color_support_term24bit : 0);
output_set_color_support(support);