[{"data":1,"prerenderedAt":2370},["ShallowReactive",2],{"page-\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Frespecting-no-color-and-force-color\u002F":3,"content-directory":1823},{"id":4,"title":5,"body":6,"date":1809,"description":1810,"difficulty":1811,"draft":1812,"extension":1813,"meta":1814,"navigation":213,"path":1815,"seo":1816,"stem":1817,"tags":1818,"updated":1809,"__hash__":1822},"content\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Frespecting-no-color-and-force-color\u002Findex.md","Respecting NO_COLOR and FORCE_COLOR in Python CLIs",{"type":7,"value":8,"toc":1790},"minimark",[9,40,45,62,66,70,73,112,129,133,136,168,172,500,952,955,1051,1062,1066,1069,1125,1129,1143,1634,1642,1646,1666,1670,1678,1687,1698,1714,1718,1728,1732,1739,1743,1752,1756,1787],[10,11,12,13,17,18,21,22,25,26,29,30,33,34,39],"p",{},"Colour makes a CLI's output faster to scan: green for healthy, red for failed, dim for less important detail. It also causes some of the most irritating bugs in command-line tools — escape codes like ",[14,15,16],"code",{},"\\x1b[32m"," sprinkled through files, ",[14,19,20],{},"grep"," results, CI logs and data piped into other programs — and it ignores users who simply do not want it, whether for accessibility, readability on their terminal theme, or preference. Two community conventions exist precisely to settle who decides: ",[14,23,24],{},"NO_COLOR"," (colour off, from any tool) and ",[14,27,28],{},"FORCE_COLOR"," (colour on, even when the output is not a terminal). This guide implements colour handling that respects both, adds a ",[14,31,32],{},"--color"," flag that beats them, routes everything through one Rich console so nothing bypasses the decision, and tests every combination. It belongs to the ",[35,36,38],"a",{"href":37},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002F","cross-platform terminal compatibility topic",".",[41,42,44],"h2",{"id":43},"prerequisites","Prerequisites",[46,47,48,59],"ul",{},[49,50,51,52,55,56,39],"li",{},"A CLI that uses Rich for styled output (Typer includes it), or Click's ",[14,53,54],{},"style","\u002F",[14,57,58],{},"secho",[49,60,61],{},"A habit of never writing raw ANSI escape sequences yourself — if you have them, this guide replaces them.",[41,63,65],{"id":64},"who-decides-whether-to-colour","Who decides whether to colour",[67,68],"inline-diagram",{"name":69},"nc-precedence",[10,71,72],{},"The decision follows the same precedence as every other setting — explicit command-line choice first, then the environment, then automatic detection:",[74,75,76,85,92,99],"ol",{},[49,77,78,84],{},[79,80,81],"strong",{},[14,82,83],{},"--color=always|never|auto"," on the command line. The user said exactly what they want for this invocation.",[49,86,87,91],{},[79,88,89],{},[14,90,24],{},": if set to any non-empty value, do not emit colour. It is how users opt out globally, across every tool that follows the convention.",[49,93,94,98],{},[79,95,96],{},[14,97,28],{},": emit colour even though output is not a terminal. CI systems and log viewers that render ANSI codes set it so logs keep their colour.",[49,100,101,104,105,108,109,39],{},[79,102,103],{},"Automatic",": colour only when writing to a terminal whose ",[14,106,107],{},"TERM"," is not ",[14,110,111],{},"dumb",[10,113,114,115,117,118,121,122,124,125,128],{},"Note the subtlety in ",[14,116,24],{},"'s definition: it asks tools not to add ",[79,119,120],{},"colour","; bold and underline are still allowed. Rich follows that reading, which is why ",[14,123,24],{}," output may still contain bold escape codes when it goes to a terminal — and why a separate ",[14,126,127],{},"--color never"," that disables all styling is still worth offering.",[41,130,132],{"id":131},"who-already-does-this-for-you","Who already does this for you",[67,134],{"name":135},"nc-matrix",[10,137,138,139,142,143,146,147,149,150,152,153,156,157,160,161,164,165,167],{},"Rich's ",[14,140,141],{},"Console"," implements most of the decision automatically: it detects whether its file is a terminal, respects ",[14,144,145],{},"TERM=dumb",", strips colour when ",[14,148,24],{}," is set, and forces styling when ",[14,151,28],{}," is set. Click's ",[14,154,155],{},"echo"," strips ANSI codes when the output is not a terminal. The recurring bug is code that ",[79,158,159],{},"bypasses"," these: hand-written escape strings, ",[14,162,163],{},"print()"," of pre-styled text, or a second ",[14,166,141],{}," created somewhere with different settings. The fix is structural — make one console, from one decision, and use it everywhere.",[41,169,171],{"id":170},"the-recipe","The recipe",[173,174,179],"pre",{"className":175,"code":176,"language":177,"meta":178,"style":178},"language-python shiki shiki-themes github-light github-dark","# src\u002Fmytool\u002Fcolor.py\nfrom __future__ import annotations\n\nfrom enum import Enum\n\nfrom rich.console import Console\n\n\nclass ColorMode(str, Enum):\n    auto = \"auto\"\n    always = \"always\"\n    never = \"never\"\n\n\ndef make_console(mode: ColorMode = ColorMode.auto, *, stderr: bool = False) -> Console:\n    \"\"\"One place that decides styling.\n\n    auto   -> Rich decides: TTY and TERM, then NO_COLOR (strip colour) and FORCE_COLOR (force it)\n    always -> styled output even into pipes and files (the flag beats the environment)\n    never  -> no escape codes at all\n    \"\"\"\n    if mode is ColorMode.always:\n        return Console(stderr=stderr, force_terminal=True)\n    if mode is ColorMode.never:\n        return Console(stderr=stderr, color_system=None, force_terminal=False)\n    return Console(stderr=stderr)\n","python","",[14,180,181,190,208,215,229,234,247,252,257,282,295,306,317,322,327,362,368,373,379,385,391,397,412,441,453,485],{"__ignoreMap":178},[182,183,186],"span",{"class":184,"line":185},"line",1,[182,187,189],{"class":188},"sJ8bj","# src\u002Fmytool\u002Fcolor.py\n",[182,191,193,197,201,204],{"class":184,"line":192},2,[182,194,196],{"class":195},"szBVR","from",[182,198,200],{"class":199},"sj4cs"," __future__",[182,202,203],{"class":195}," import",[182,205,207],{"class":206},"sVt8B"," annotations\n",[182,209,211],{"class":184,"line":210},3,[182,212,214],{"emptyLinePlaceholder":213},true,"\n",[182,216,218,220,223,226],{"class":184,"line":217},4,[182,219,196],{"class":195},[182,221,222],{"class":206}," enum ",[182,224,225],{"class":195},"import",[182,227,228],{"class":206}," Enum\n",[182,230,232],{"class":184,"line":231},5,[182,233,214],{"emptyLinePlaceholder":213},[182,235,237,239,242,244],{"class":184,"line":236},6,[182,238,196],{"class":195},[182,240,241],{"class":206}," rich.console ",[182,243,225],{"class":195},[182,245,246],{"class":206}," Console\n",[182,248,250],{"class":184,"line":249},7,[182,251,214],{"emptyLinePlaceholder":213},[182,253,255],{"class":184,"line":254},8,[182,256,214],{"emptyLinePlaceholder":213},[182,258,260,263,267,270,273,276,279],{"class":184,"line":259},9,[182,261,262],{"class":195},"class",[182,264,266],{"class":265},"sScJk"," ColorMode",[182,268,269],{"class":206},"(",[182,271,272],{"class":199},"str",[182,274,275],{"class":206},", ",[182,277,278],{"class":265},"Enum",[182,280,281],{"class":206},"):\n",[182,283,285,288,291],{"class":184,"line":284},10,[182,286,287],{"class":206},"    auto ",[182,289,290],{"class":195},"=",[182,292,294],{"class":293},"sZZnC"," \"auto\"\n",[182,296,298,301,303],{"class":184,"line":297},11,[182,299,300],{"class":206},"    always ",[182,302,290],{"class":195},[182,304,305],{"class":293}," \"always\"\n",[182,307,309,312,314],{"class":184,"line":308},12,[182,310,311],{"class":206},"    never ",[182,313,290],{"class":195},[182,315,316],{"class":293}," \"never\"\n",[182,318,320],{"class":184,"line":319},13,[182,321,214],{"emptyLinePlaceholder":213},[182,323,325],{"class":184,"line":324},14,[182,326,214],{"emptyLinePlaceholder":213},[182,328,330,333,336,339,341,344,347,350,353,356,359],{"class":184,"line":329},15,[182,331,332],{"class":195},"def",[182,334,335],{"class":265}," make_console",[182,337,338],{"class":206},"(mode: ColorMode ",[182,340,290],{"class":195},[182,342,343],{"class":206}," ColorMode.auto, ",[182,345,346],{"class":195},"*",[182,348,349],{"class":206},", stderr: ",[182,351,352],{"class":199},"bool",[182,354,355],{"class":195}," =",[182,357,358],{"class":199}," False",[182,360,361],{"class":206},") -> Console:\n",[182,363,365],{"class":184,"line":364},16,[182,366,367],{"class":293},"    \"\"\"One place that decides styling.\n",[182,369,371],{"class":184,"line":370},17,[182,372,214],{"emptyLinePlaceholder":213},[182,374,376],{"class":184,"line":375},18,[182,377,378],{"class":293},"    auto   -> Rich decides: TTY and TERM, then NO_COLOR (strip colour) and FORCE_COLOR (force it)\n",[182,380,382],{"class":184,"line":381},19,[182,383,384],{"class":293},"    always -> styled output even into pipes and files (the flag beats the environment)\n",[182,386,388],{"class":184,"line":387},20,[182,389,390],{"class":293},"    never  -> no escape codes at all\n",[182,392,394],{"class":184,"line":393},21,[182,395,396],{"class":293},"    \"\"\"\n",[182,398,400,403,406,409],{"class":184,"line":399},22,[182,401,402],{"class":195},"    if",[182,404,405],{"class":206}," mode ",[182,407,408],{"class":195},"is",[182,410,411],{"class":206}," ColorMode.always:\n",[182,413,415,418,421,425,427,430,433,435,438],{"class":184,"line":414},23,[182,416,417],{"class":195},"        return",[182,419,420],{"class":206}," Console(",[182,422,424],{"class":423},"s4XuR","stderr",[182,426,290],{"class":195},[182,428,429],{"class":206},"stderr, ",[182,431,432],{"class":423},"force_terminal",[182,434,290],{"class":195},[182,436,437],{"class":199},"True",[182,439,440],{"class":206},")\n",[182,442,444,446,448,450],{"class":184,"line":443},24,[182,445,402],{"class":195},[182,447,405],{"class":206},[182,449,408],{"class":195},[182,451,452],{"class":206}," ColorMode.never:\n",[182,454,456,458,460,462,464,466,469,471,474,476,478,480,483],{"class":184,"line":455},25,[182,457,417],{"class":195},[182,459,420],{"class":206},[182,461,424],{"class":423},[182,463,290],{"class":195},[182,465,429],{"class":206},[182,467,468],{"class":423},"color_system",[182,470,290],{"class":195},[182,472,473],{"class":199},"None",[182,475,275],{"class":206},[182,477,432],{"class":423},[182,479,290],{"class":195},[182,481,482],{"class":199},"False",[182,484,440],{"class":206},[182,486,488,491,493,495,497],{"class":184,"line":487},26,[182,489,490],{"class":195},"    return",[182,492,420],{"class":206},[182,494,424],{"class":423},[182,496,290],{"class":195},[182,498,499],{"class":206},"stderr)\n",[173,501,503],{"className":175,"code":502,"language":177,"meta":178,"style":178},"# src\u002Fmytool\u002Fcli.py\nfrom __future__ import annotations\n\nfrom typing import Annotated\n\nimport typer\n\nfrom mytool.color import ColorMode, make_console\n\napp = typer.Typer()\nSTATUS = [(\"web\", \"healthy\"), (\"api\", \"degraded\"), (\"billing\", \"down\")]\nSTYLE = {\"healthy\": \"green\", \"degraded\": \"yellow\", \"down\": \"bold red\"}\nMARK = {\"healthy\": \"✓\", \"degraded\": \"!\", \"down\": \"✗\"}\n\n\n@app.callback()\ndef main(\n    ctx: typer.Context,\n    color: Annotated[ColorMode, typer.Option(\"--color\", envvar=\"MYTOOL_COLOR\",\n                                             help=\"Colour output: auto, always or never.\")] = ColorMode.auto,\n) -> None:\n    \"\"\"Service status tool.\"\"\"\n    ctx.obj = make_console(color)\n\n\n@app.command()\ndef status(ctx: typer.Context) -> None:\n    \"\"\"Show service health.\"\"\"\n    console = ctx.obj\n    for name, state in STATUS:\n        console.print(f\"{MARK[state]} {name:\u003C8} [{STYLE[state]}]{state}[\u002F]\", highlight=False)\n\n\nif __name__ == \"__main__\":\n    app()\n",[14,504,505,510,520,524,536,540,547,551,563,567,577,619,658,694,698,702,710,720,725,746,764,774,779,789,793,797,804,819,825,836,853,919,924,929,946],{"__ignoreMap":178},[182,506,507],{"class":184,"line":185},[182,508,509],{"class":188},"# src\u002Fmytool\u002Fcli.py\n",[182,511,512,514,516,518],{"class":184,"line":192},[182,513,196],{"class":195},[182,515,200],{"class":199},[182,517,203],{"class":195},[182,519,207],{"class":206},[182,521,522],{"class":184,"line":210},[182,523,214],{"emptyLinePlaceholder":213},[182,525,526,528,531,533],{"class":184,"line":217},[182,527,196],{"class":195},[182,529,530],{"class":206}," typing ",[182,532,225],{"class":195},[182,534,535],{"class":206}," Annotated\n",[182,537,538],{"class":184,"line":231},[182,539,214],{"emptyLinePlaceholder":213},[182,541,542,544],{"class":184,"line":236},[182,543,225],{"class":195},[182,545,546],{"class":206}," typer\n",[182,548,549],{"class":184,"line":249},[182,550,214],{"emptyLinePlaceholder":213},[182,552,553,555,558,560],{"class":184,"line":254},[182,554,196],{"class":195},[182,556,557],{"class":206}," mytool.color ",[182,559,225],{"class":195},[182,561,562],{"class":206}," ColorMode, make_console\n",[182,564,565],{"class":184,"line":259},[182,566,214],{"emptyLinePlaceholder":213},[182,568,569,572,574],{"class":184,"line":284},[182,570,571],{"class":206},"app ",[182,573,290],{"class":195},[182,575,576],{"class":206}," typer.Typer()\n",[182,578,579,582,584,587,590,592,595,598,601,603,606,608,611,613,616],{"class":184,"line":297},[182,580,581],{"class":199},"STATUS",[182,583,355],{"class":195},[182,585,586],{"class":206}," [(",[182,588,589],{"class":293},"\"web\"",[182,591,275],{"class":206},[182,593,594],{"class":293},"\"healthy\"",[182,596,597],{"class":206},"), (",[182,599,600],{"class":293},"\"api\"",[182,602,275],{"class":206},[182,604,605],{"class":293},"\"degraded\"",[182,607,597],{"class":206},[182,609,610],{"class":293},"\"billing\"",[182,612,275],{"class":206},[182,614,615],{"class":293},"\"down\"",[182,617,618],{"class":206},")]\n",[182,620,621,624,626,629,631,634,637,639,641,643,646,648,650,652,655],{"class":184,"line":308},[182,622,623],{"class":199},"STYLE",[182,625,355],{"class":195},[182,627,628],{"class":206}," {",[182,630,594],{"class":293},[182,632,633],{"class":206},": ",[182,635,636],{"class":293},"\"green\"",[182,638,275],{"class":206},[182,640,605],{"class":293},[182,642,633],{"class":206},[182,644,645],{"class":293},"\"yellow\"",[182,647,275],{"class":206},[182,649,615],{"class":293},[182,651,633],{"class":206},[182,653,654],{"class":293},"\"bold red\"",[182,656,657],{"class":206},"}\n",[182,659,660,663,665,667,669,671,674,676,678,680,683,685,687,689,692],{"class":184,"line":319},[182,661,662],{"class":199},"MARK",[182,664,355],{"class":195},[182,666,628],{"class":206},[182,668,594],{"class":293},[182,670,633],{"class":206},[182,672,673],{"class":293},"\"✓\"",[182,675,275],{"class":206},[182,677,605],{"class":293},[182,679,633],{"class":206},[182,681,682],{"class":293},"\"!\"",[182,684,275],{"class":206},[182,686,615],{"class":293},[182,688,633],{"class":206},[182,690,691],{"class":293},"\"✗\"",[182,693,657],{"class":206},[182,695,696],{"class":184,"line":324},[182,697,214],{"emptyLinePlaceholder":213},[182,699,700],{"class":184,"line":329},[182,701,214],{"emptyLinePlaceholder":213},[182,703,704,707],{"class":184,"line":364},[182,705,706],{"class":265},"@app.callback",[182,708,709],{"class":206},"()\n",[182,711,712,714,717],{"class":184,"line":370},[182,713,332],{"class":195},[182,715,716],{"class":265}," main",[182,718,719],{"class":206},"(\n",[182,721,722],{"class":184,"line":375},[182,723,724],{"class":206},"    ctx: typer.Context,\n",[182,726,727,730,733,735,738,740,743],{"class":184,"line":381},[182,728,729],{"class":206},"    color: Annotated[ColorMode, typer.Option(",[182,731,732],{"class":293},"\"--color\"",[182,734,275],{"class":206},[182,736,737],{"class":423},"envvar",[182,739,290],{"class":195},[182,741,742],{"class":293},"\"MYTOOL_COLOR\"",[182,744,745],{"class":206},",\n",[182,747,748,751,753,756,759,761],{"class":184,"line":387},[182,749,750],{"class":423},"                                             help",[182,752,290],{"class":195},[182,754,755],{"class":293},"\"Colour output: auto, always or never.\"",[182,757,758],{"class":206},")] ",[182,760,290],{"class":195},[182,762,763],{"class":206}," ColorMode.auto,\n",[182,765,766,769,771],{"class":184,"line":393},[182,767,768],{"class":206},") -> ",[182,770,473],{"class":199},[182,772,773],{"class":206},":\n",[182,775,776],{"class":184,"line":399},[182,777,778],{"class":293},"    \"\"\"Service status tool.\"\"\"\n",[182,780,781,784,786],{"class":184,"line":414},[182,782,783],{"class":206},"    ctx.obj ",[182,785,290],{"class":195},[182,787,788],{"class":206}," make_console(color)\n",[182,790,791],{"class":184,"line":443},[182,792,214],{"emptyLinePlaceholder":213},[182,794,795],{"class":184,"line":455},[182,796,214],{"emptyLinePlaceholder":213},[182,798,799,802],{"class":184,"line":487},[182,800,801],{"class":265},"@app.command",[182,803,709],{"class":206},[182,805,807,809,812,815,817],{"class":184,"line":806},27,[182,808,332],{"class":195},[182,810,811],{"class":265}," status",[182,813,814],{"class":206},"(ctx: typer.Context) -> ",[182,816,473],{"class":199},[182,818,773],{"class":206},[182,820,822],{"class":184,"line":821},28,[182,823,824],{"class":293},"    \"\"\"Show service health.\"\"\"\n",[182,826,828,831,833],{"class":184,"line":827},29,[182,829,830],{"class":206},"    console ",[182,832,290],{"class":195},[182,834,835],{"class":206}," ctx.obj\n",[182,837,839,842,845,848,851],{"class":184,"line":838},30,[182,840,841],{"class":195},"    for",[182,843,844],{"class":206}," name, state ",[182,846,847],{"class":195},"in",[182,849,850],{"class":199}," STATUS",[182,852,773],{"class":206},[182,854,856,859,862,865,868,871,874,876,879,882,884,887,890,892,894,897,900,903,905,908,910,913,915,917],{"class":184,"line":855},31,[182,857,858],{"class":206},"        console.print(",[182,860,861],{"class":195},"f",[182,863,864],{"class":293},"\"",[182,866,867],{"class":199},"{MARK",[182,869,870],{"class":206},"[state]",[182,872,873],{"class":199},"}",[182,875,628],{"class":199},[182,877,878],{"class":206},"name",[182,880,881],{"class":195},":\u003C8",[182,883,873],{"class":199},[182,885,886],{"class":293}," [",[182,888,889],{"class":199},"{STYLE",[182,891,870],{"class":206},[182,893,873],{"class":199},[182,895,896],{"class":293},"]",[182,898,899],{"class":199},"{",[182,901,902],{"class":206},"state",[182,904,873],{"class":199},[182,906,907],{"class":293},"[\u002F]\"",[182,909,275],{"class":206},[182,911,912],{"class":423},"highlight",[182,914,290],{"class":195},[182,916,482],{"class":199},[182,918,440],{"class":206},[182,920,922],{"class":184,"line":921},32,[182,923,214],{"emptyLinePlaceholder":213},[182,925,927],{"class":184,"line":926},33,[182,928,214],{"emptyLinePlaceholder":213},[182,930,932,935,938,941,944],{"class":184,"line":931},34,[182,933,934],{"class":195},"if",[182,936,937],{"class":199}," __name__",[182,939,940],{"class":195}," ==",[182,942,943],{"class":293}," \"__main__\"",[182,945,773],{"class":206},[182,947,949],{"class":184,"line":948},35,[182,950,951],{"class":206},"    app()\n",[10,953,954],{},"How it fits together:",[46,956,957,985,1001,1015,1028,1036,1042],{},[49,958,959,962,963,275,966,275,969,972,973,275,976,275,978,981,982,984],{},[79,960,961],{},"The flag has three values"," — ",[14,964,965],{},"auto",[14,967,968],{},"always",[14,970,971],{},"never"," — the same trio used by ",[14,974,975],{},"git",[14,977,20],{},[14,979,980],{},"ls"," and many others. ",[14,983,965],{}," is the default.",[49,986,987,992,993,275,995,997,998,1000],{},[79,988,989,991],{},[14,990,965],{}," delegates to Rich",", which applies TTY detection, ",[14,994,145],{},[14,996,24],{}," and ",[14,999,28],{},". There is no reason to reimplement that logic.",[49,1002,1003,1011,1012,39],{},[79,1004,1005,1007,1008],{},[14,1006,968],{}," uses ",[14,1009,1010],{},"force_terminal=True",", producing styled output even into a pipe — useful for ",[14,1013,1014],{},"mytool status --color always | less -R",[49,1016,1017,1024,1025,1027],{},[79,1018,1019,1007,1021],{},[14,1020,971],{},[14,1022,1023],{},"color_system=None",", which disables all styling escape codes, including bold — stricter than ",[14,1026,24],{},", for users and scripts that want guaranteed plain text.",[49,1029,1030,1035],{},[79,1031,1032],{},[14,1033,1034],{},"envvar=\"MYTOOL_COLOR\""," lets users set a tool-specific default in their shell profile, which still loses to an explicit flag.",[49,1037,1038,1041],{},[79,1039,1040],{},"One console, created in the callback"," and passed down on the context. Commands never construct their own.",[49,1043,1044,1047,1048,1050],{},[79,1045,1046],{},"Colour never carries meaning alone."," Each status has a symbol and a word; colour only reinforces them. With ",[14,1049,24],{},", output loses decoration, not information.",[10,1052,1053,1054,1057,1058,39],{},"For narration on stderr — progress, warnings — create a second console with ",[14,1055,1056],{},"stderr=True"," from the same mode, so both streams follow the same rule. Styling conventions for the palette itself are covered in ",[35,1059,1061],{"href":1060},"\u002Fadvanced-input-parsing-user-experience\u002Finteractive-terminal-ui-with-rich\u002Ftheming-rich-output-consistently\u002F","theming Rich output consistently",[41,1063,1065],{"id":1064},"ux-considerations","UX considerations",[67,1067],{"name":1068},"nc-terminal",[46,1070,1071,1081,1091,1107],{},[49,1072,1073,1076,1077,1080],{},[79,1074,1075],{},"Plain output in pipes by default."," ",[14,1078,1079],{},"mytool status | grep down"," should match plain text, not text wrapped in escape codes. Rich's automatic detection does this; code that forces styling does not.",[49,1082,1083,1086,1087,1090],{},[79,1084,1085],{},"Keep colour off stdout data."," Machine output (",[14,1088,1089],{},"--json",") should never be styled, whatever the colour mode; styling is for human views.",[49,1092,1093,1096,1097,275,1100,275,1103,1106],{},[79,1094,1095],{},"Choose theme-safe colours."," Use named ANSI colours (",[14,1098,1099],{},"red",[14,1101,1102],{},"green",[14,1104,1105],{},"yellow",") for status, which terminal themes remap to readable shades, rather than fixed RGB values that disappear on light or dark backgrounds.",[49,1108,1109,1112,1113,1116,1117,275,1119,997,1121,1124],{},[79,1110,1111],{},"Document the controls."," One line in ",[14,1114,1115],{},"--help"," and a sentence in the docs about ",[14,1118,24],{},[14,1120,28],{},[14,1122,1123],{},"MYTOOL_COLOR"," saves users hunting for how to turn colour off.",[41,1126,1128],{"id":1127},"testing-the-behaviour","Testing the behaviour",[10,1130,1131,1134,1135,1138,1139,1142],{},[14,1132,1133],{},"CliRunner"," output is not a terminal, which makes it perfect for checking the pipe case, and its ",[14,1136,1137],{},"env="," parameter reaches every environment combination. Testing for the escape-sequence prefix ",[14,1140,1141],{},"\\x1b["," is enough to tell styled from plain output:",[173,1144,1146],{"className":175,"code":1145,"language":177,"meta":178,"style":178},"# tests\u002Ftest_color.py\nimport pytest\nfrom typer.testing import CliRunner\n\nfrom mytool.cli import app\n\nrunner = CliRunner()\nESC = \"\\x1b[\"\n\n\ndef run(*args, env=None):\n    base = {\"NO_COLOR\": \"\", \"FORCE_COLOR\": \"\", \"TERM\": \"xterm-256color\"}\n    return runner.invoke(app, [*args, \"status\"], env={**base, **(env or {})})\n\n\ndef test_auto_into_a_pipe_is_plain():\n    assert ESC not in run().output\n\n\ndef test_always_beats_no_color():\n    assert ESC in run(\"--color\", \"always\", env={\"NO_COLOR\": \"1\"}).output\n\n\ndef test_never_beats_force_color():\n    assert ESC not in run(\"--color\", \"never\", env={\"FORCE_COLOR\": \"1\"}).output\n\n\ndef test_force_color_applies_in_auto_mode():\n    assert ESC in run(env={\"FORCE_COLOR\": \"1\"}).output\n\n\ndef test_env_var_can_set_the_mode():\n    assert ESC in run(env={\"MYTOOL_COLOR\": \"always\"}).output\n\n\n@pytest.mark.parametrize(\"mode\", [\"auto\", \"always\", \"never\"])\ndef test_meaning_survives_without_colour(mode):\n    out = run(\"--color\", mode).output\n    assert \"down\" in out and \"✗\" in out\n",[14,1147,1148,1153,1160,1172,1176,1188,1192,1202,1218,1222,1226,1246,1284,1326,1330,1334,1344,1361,1365,1369,1378,1414,1418,1422,1431,1466,1470,1474,1483,1507,1511,1515,1524,1548,1552,1556,1584,1595,1610],{"__ignoreMap":178},[182,1149,1150],{"class":184,"line":185},[182,1151,1152],{"class":188},"# tests\u002Ftest_color.py\n",[182,1154,1155,1157],{"class":184,"line":192},[182,1156,225],{"class":195},[182,1158,1159],{"class":206}," pytest\n",[182,1161,1162,1164,1167,1169],{"class":184,"line":210},[182,1163,196],{"class":195},[182,1165,1166],{"class":206}," typer.testing ",[182,1168,225],{"class":195},[182,1170,1171],{"class":206}," CliRunner\n",[182,1173,1174],{"class":184,"line":217},[182,1175,214],{"emptyLinePlaceholder":213},[182,1177,1178,1180,1183,1185],{"class":184,"line":231},[182,1179,196],{"class":195},[182,1181,1182],{"class":206}," mytool.cli ",[182,1184,225],{"class":195},[182,1186,1187],{"class":206}," app\n",[182,1189,1190],{"class":184,"line":236},[182,1191,214],{"emptyLinePlaceholder":213},[182,1193,1194,1197,1199],{"class":184,"line":249},[182,1195,1196],{"class":206},"runner ",[182,1198,290],{"class":195},[182,1200,1201],{"class":206}," CliRunner()\n",[182,1203,1204,1207,1209,1212,1215],{"class":184,"line":254},[182,1205,1206],{"class":199},"ESC",[182,1208,355],{"class":195},[182,1210,1211],{"class":293}," \"",[182,1213,1214],{"class":199},"\\x1b",[182,1216,1217],{"class":293},"[\"\n",[182,1219,1220],{"class":184,"line":259},[182,1221,214],{"emptyLinePlaceholder":213},[182,1223,1224],{"class":184,"line":284},[182,1225,214],{"emptyLinePlaceholder":213},[182,1227,1228,1230,1233,1235,1237,1240,1242,1244],{"class":184,"line":297},[182,1229,332],{"class":195},[182,1231,1232],{"class":265}," run",[182,1234,269],{"class":206},[182,1236,346],{"class":195},[182,1238,1239],{"class":206},"args, env",[182,1241,290],{"class":195},[182,1243,473],{"class":199},[182,1245,281],{"class":206},[182,1247,1248,1251,1253,1255,1258,1260,1263,1265,1268,1270,1272,1274,1277,1279,1282],{"class":184,"line":308},[182,1249,1250],{"class":206},"    base ",[182,1252,290],{"class":195},[182,1254,628],{"class":206},[182,1256,1257],{"class":293},"\"NO_COLOR\"",[182,1259,633],{"class":206},[182,1261,1262],{"class":293},"\"\"",[182,1264,275],{"class":206},[182,1266,1267],{"class":293},"\"FORCE_COLOR\"",[182,1269,633],{"class":206},[182,1271,1262],{"class":293},[182,1273,275],{"class":206},[182,1275,1276],{"class":293},"\"TERM\"",[182,1278,633],{"class":206},[182,1280,1281],{"class":293},"\"xterm-256color\"",[182,1283,657],{"class":206},[182,1285,1286,1288,1291,1293,1296,1299,1302,1305,1307,1309,1312,1315,1317,1320,1323],{"class":184,"line":319},[182,1287,490],{"class":195},[182,1289,1290],{"class":206}," runner.invoke(app, [",[182,1292,346],{"class":195},[182,1294,1295],{"class":206},"args, ",[182,1297,1298],{"class":293},"\"status\"",[182,1300,1301],{"class":206},"], ",[182,1303,1304],{"class":423},"env",[182,1306,290],{"class":195},[182,1308,899],{"class":206},[182,1310,1311],{"class":195},"**",[182,1313,1314],{"class":206},"base, ",[182,1316,1311],{"class":195},[182,1318,1319],{"class":206},"(env ",[182,1321,1322],{"class":195},"or",[182,1324,1325],{"class":206}," {})})\n",[182,1327,1328],{"class":184,"line":324},[182,1329,214],{"emptyLinePlaceholder":213},[182,1331,1332],{"class":184,"line":329},[182,1333,214],{"emptyLinePlaceholder":213},[182,1335,1336,1338,1341],{"class":184,"line":364},[182,1337,332],{"class":195},[182,1339,1340],{"class":265}," test_auto_into_a_pipe_is_plain",[182,1342,1343],{"class":206},"():\n",[182,1345,1346,1349,1352,1355,1358],{"class":184,"line":370},[182,1347,1348],{"class":195},"    assert",[182,1350,1351],{"class":199}," ESC",[182,1353,1354],{"class":195}," not",[182,1356,1357],{"class":195}," in",[182,1359,1360],{"class":206}," run().output\n",[182,1362,1363],{"class":184,"line":375},[182,1364,214],{"emptyLinePlaceholder":213},[182,1366,1367],{"class":184,"line":381},[182,1368,214],{"emptyLinePlaceholder":213},[182,1370,1371,1373,1376],{"class":184,"line":387},[182,1372,332],{"class":195},[182,1374,1375],{"class":265}," test_always_beats_no_color",[182,1377,1343],{"class":206},[182,1379,1380,1382,1384,1386,1389,1391,1393,1396,1398,1400,1402,1404,1406,1408,1411],{"class":184,"line":393},[182,1381,1348],{"class":195},[182,1383,1351],{"class":199},[182,1385,1357],{"class":195},[182,1387,1388],{"class":206}," run(",[182,1390,732],{"class":293},[182,1392,275],{"class":206},[182,1394,1395],{"class":293},"\"always\"",[182,1397,275],{"class":206},[182,1399,1304],{"class":423},[182,1401,290],{"class":195},[182,1403,899],{"class":206},[182,1405,1257],{"class":293},[182,1407,633],{"class":206},[182,1409,1410],{"class":293},"\"1\"",[182,1412,1413],{"class":206},"}).output\n",[182,1415,1416],{"class":184,"line":399},[182,1417,214],{"emptyLinePlaceholder":213},[182,1419,1420],{"class":184,"line":414},[182,1421,214],{"emptyLinePlaceholder":213},[182,1423,1424,1426,1429],{"class":184,"line":443},[182,1425,332],{"class":195},[182,1427,1428],{"class":265}," test_never_beats_force_color",[182,1430,1343],{"class":206},[182,1432,1433,1435,1437,1439,1441,1443,1445,1447,1450,1452,1454,1456,1458,1460,1462,1464],{"class":184,"line":455},[182,1434,1348],{"class":195},[182,1436,1351],{"class":199},[182,1438,1354],{"class":195},[182,1440,1357],{"class":195},[182,1442,1388],{"class":206},[182,1444,732],{"class":293},[182,1446,275],{"class":206},[182,1448,1449],{"class":293},"\"never\"",[182,1451,275],{"class":206},[182,1453,1304],{"class":423},[182,1455,290],{"class":195},[182,1457,899],{"class":206},[182,1459,1267],{"class":293},[182,1461,633],{"class":206},[182,1463,1410],{"class":293},[182,1465,1413],{"class":206},[182,1467,1468],{"class":184,"line":487},[182,1469,214],{"emptyLinePlaceholder":213},[182,1471,1472],{"class":184,"line":806},[182,1473,214],{"emptyLinePlaceholder":213},[182,1475,1476,1478,1481],{"class":184,"line":821},[182,1477,332],{"class":195},[182,1479,1480],{"class":265}," test_force_color_applies_in_auto_mode",[182,1482,1343],{"class":206},[182,1484,1485,1487,1489,1491,1493,1495,1497,1499,1501,1503,1505],{"class":184,"line":827},[182,1486,1348],{"class":195},[182,1488,1351],{"class":199},[182,1490,1357],{"class":195},[182,1492,1388],{"class":206},[182,1494,1304],{"class":423},[182,1496,290],{"class":195},[182,1498,899],{"class":206},[182,1500,1267],{"class":293},[182,1502,633],{"class":206},[182,1504,1410],{"class":293},[182,1506,1413],{"class":206},[182,1508,1509],{"class":184,"line":838},[182,1510,214],{"emptyLinePlaceholder":213},[182,1512,1513],{"class":184,"line":855},[182,1514,214],{"emptyLinePlaceholder":213},[182,1516,1517,1519,1522],{"class":184,"line":921},[182,1518,332],{"class":195},[182,1520,1521],{"class":265}," test_env_var_can_set_the_mode",[182,1523,1343],{"class":206},[182,1525,1526,1528,1530,1532,1534,1536,1538,1540,1542,1544,1546],{"class":184,"line":926},[182,1527,1348],{"class":195},[182,1529,1351],{"class":199},[182,1531,1357],{"class":195},[182,1533,1388],{"class":206},[182,1535,1304],{"class":423},[182,1537,290],{"class":195},[182,1539,899],{"class":206},[182,1541,742],{"class":293},[182,1543,633],{"class":206},[182,1545,1395],{"class":293},[182,1547,1413],{"class":206},[182,1549,1550],{"class":184,"line":931},[182,1551,214],{"emptyLinePlaceholder":213},[182,1553,1554],{"class":184,"line":948},[182,1555,214],{"emptyLinePlaceholder":213},[182,1557,1559,1562,1564,1567,1570,1573,1575,1577,1579,1581],{"class":184,"line":1558},36,[182,1560,1561],{"class":265},"@pytest.mark.parametrize",[182,1563,269],{"class":206},[182,1565,1566],{"class":293},"\"mode\"",[182,1568,1569],{"class":206},", [",[182,1571,1572],{"class":293},"\"auto\"",[182,1574,275],{"class":206},[182,1576,1395],{"class":293},[182,1578,275],{"class":206},[182,1580,1449],{"class":293},[182,1582,1583],{"class":206},"])\n",[182,1585,1587,1589,1592],{"class":184,"line":1586},37,[182,1588,332],{"class":195},[182,1590,1591],{"class":265}," test_meaning_survives_without_colour",[182,1593,1594],{"class":206},"(mode):\n",[182,1596,1598,1601,1603,1605,1607],{"class":184,"line":1597},38,[182,1599,1600],{"class":206},"    out ",[182,1602,290],{"class":195},[182,1604,1388],{"class":206},[182,1606,732],{"class":293},[182,1608,1609],{"class":206},", mode).output\n",[182,1611,1613,1615,1618,1620,1623,1626,1629,1631],{"class":184,"line":1612},39,[182,1614,1348],{"class":195},[182,1616,1617],{"class":293}," \"down\"",[182,1619,1357],{"class":195},[182,1621,1622],{"class":206}," out ",[182,1624,1625],{"class":195},"and",[182,1627,1628],{"class":293}," \"✗\"",[182,1630,1357],{"class":195},[182,1632,1633],{"class":206}," out\n",[10,1635,1636,1637,997,1639,1641],{},"The base environment clears ",[14,1638,24],{},[14,1640,28],{}," so the developer's own settings — or the CI system's — cannot leak into the results. The last test is the one that protects accessibility: in every mode, the words and symbols that carry meaning are present.",[41,1643,1645],{"id":1644},"conclusion","Conclusion",[10,1647,1648,1649,1652,1653,275,1655,1657,1658,1660,1661,1663,1664,39],{},"Respecting colour conventions is mostly a matter of not fighting the tools that already implement them. Offer ",[14,1650,1651],{},"--color auto|always|never"," (with an environment variable for a personal default), let Rich apply ",[14,1654,24],{},[14,1656,28],{},", TTY and ",[14,1659,107],{}," detection in ",[14,1662,965],{}," mode, force or disable styling explicitly for the other two, and route every styled line through one console created from that decision. Make sure meaning never depends on colour, keep machine output unstyled, and test each mode with ",[14,1665,1133],{},[41,1667,1669],{"id":1668},"frequently-asked-questions","Frequently asked questions",[1671,1672,1674,1675,1677],"h3",{"id":1673},"should-no_color-also-disable-bold-and-emoji","Should ",[14,1676,24],{}," also disable bold and emoji?",[10,1679,1680,1681,1683,1684,39],{},"The convention covers colour only, so bold is allowed. If you want a mode with no styling at all, ",[14,1682,127],{}," provides it. Emoji are a separate question of font support, discussed in ",[35,1685,1686],{"href":37},"the topic overview",[1671,1688,1690,1691,997,1694,1697],{"id":1689},"what-about-clicolor-and-clicolor_force","What about ",[14,1692,1693],{},"CLICOLOR",[14,1695,1696],{},"CLICOLOR_FORCE","?",[10,1699,1700,1701,1704,1705,1708,1709,55,1711,1713],{},"These older BSD-era variables have similar meanings (",[14,1702,1703],{},"CLICOLOR=0"," off, ",[14,1706,1707],{},"CLICOLOR_FORCE=1"," on). Supporting them costs a couple of lines in the callback — map them to the corresponding mode when neither the flag nor ",[14,1710,24],{},[14,1712,28],{}," is set — and pleases users of BSD and macOS tools.",[1671,1715,1717],{"id":1716},"what-about-colour-on-older-windows-consoles","What about colour on older Windows consoles?",[10,1719,1720,1721,1724,1725,1727],{},"Windows 10 and later understand ANSI escape sequences once virtual-terminal processing is enabled for the console, which Rich does automatically, and Windows Terminal supports truecolour. On the rare legacy console that cannot, Rich falls back to the Windows console API or to plain text. Either way the same ",[14,1722,1723],{},"make_console"," decision applies, and the ",[14,1726,127],{}," escape hatch works everywhere.",[1671,1729,1731],{"id":1730},"does-github-actions-show-colour","Does GitHub Actions show colour?",[10,1733,1734,1735,1738],{},"The Actions log viewer renders ANSI colours, but the job's stdout is not a TTY, so tools default to plain output. Setting ",[14,1736,1737],{},"FORCE_COLOR=1"," in the workflow environment restores colour for Rich-based tools, which many teams do for readability.",[1671,1740,1742],{"id":1741},"should-typers-own-help-and-error-output-follow-the-flag","Should Typer's own help and error output follow the flag?",[10,1744,1745,1746,1748,1749,1751],{},"Typer renders help and errors with Rich, which follows ",[14,1747,24],{}," and TTY detection. The global ",[14,1750,32],{}," flag cannot affect help printed before it is parsed, but it rarely needs to: help goes to a terminal in interactive use and is plain in pipes already.",[41,1753,1755],{"id":1754},"related","Related",[46,1757,1758,1764,1770,1776,1782],{},[49,1759,1760,1761],{},"Up: ",[35,1762,1763],{"href":37},"Cross-platform terminal compatibility",[49,1765,1766],{},[35,1767,1769],{"href":1768},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Ffixing-unicode-and-encoding-errors-on-windows\u002F","Fixing Unicode and encoding errors on Windows",[49,1771,1772],{},[35,1773,1775],{"href":1774},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Fadapting-output-to-terminal-width\u002F","Adapting output to terminal width",[49,1777,1778],{},[35,1779,1781],{"href":1780},"\u002Fadvanced-input-parsing-user-experience\u002Fworking-with-stdin-stdout-and-pipes\u002Fdetecting-tty-and-adapting-output\u002F","Detecting a TTY and adapting output",[49,1783,1784],{},[35,1785,1786],{"href":1060},"Theming Rich output consistently",[54,1788,1789],{},"html pre.shiki code .sJ8bj, html code.shiki .sJ8bj{--shiki-default:#6A737D;--shiki-dark:#6A737D}html pre.shiki code .szBVR, html code.shiki .szBVR{--shiki-default:#D73A49;--shiki-dark:#F97583}html pre.shiki code .sj4cs, html code.shiki .sj4cs{--shiki-default:#005CC5;--shiki-dark:#79B8FF}html pre.shiki code .sVt8B, html code.shiki .sVt8B{--shiki-default:#24292E;--shiki-dark:#E1E4E8}html pre.shiki code .sScJk, html code.shiki .sScJk{--shiki-default:#6F42C1;--shiki-dark:#B392F0}html pre.shiki code .sZZnC, html code.shiki .sZZnC{--shiki-default:#032F62;--shiki-dark:#9ECBFF}html pre.shiki code .s4XuR, html code.shiki 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var(--shiki-dark-text-decoration);}",{"title":178,"searchDepth":192,"depth":192,"links":1791},[1792,1793,1794,1795,1796,1797,1798,1799,1808],{"id":43,"depth":192,"text":44},{"id":64,"depth":192,"text":65},{"id":131,"depth":192,"text":132},{"id":170,"depth":192,"text":171},{"id":1064,"depth":192,"text":1065},{"id":1127,"depth":192,"text":1128},{"id":1644,"depth":192,"text":1645},{"id":1668,"depth":192,"text":1669,"children":1800},[1801,1803,1805,1806,1807],{"id":1673,"depth":210,"text":1802},"Should NO_COLOR also disable bold and emoji?",{"id":1689,"depth":210,"text":1804},"What about CLICOLOR and CLICOLOR_FORCE?",{"id":1716,"depth":210,"text":1717},{"id":1730,"depth":210,"text":1731},{"id":1741,"depth":210,"text":1742},{"id":1754,"depth":192,"text":1755},"2026-09-18","Handle colour the way users expect in a Python CLI: a --color flag, the NO_COLOR and FORCE_COLOR conventions, TTY detection with Rich, and tests for every 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