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I work with source code and exotic world languages.
I want to edit my source code in a monospace font.
But I also want to be able to include arbitrary Unicode text in rare scripts that might only have one or two fonts to choose from.
Most source code editors only let you choose a single simple font.
(When I say exotic languages, I'm talking about ones much rarer than Chinese, Russian, or Arabic. So editors which specifically support those might not fulfil my needs.)
Rather than trying to find an IDE or editor that allows different projects/files to use different fonts while not try to find and use a Mono Spaced font that covers all of your required languages.
While not the prettiest font that I know you can always download and install Unifont and set that as your code editor front in any code editor that has UTF-8 support. It is mono-spaced, free, GPL 2+ with the GNU font embedding exception. Works on a variety of machines and has a huge range of the code pages supported and currently 114,428 glyphs in total at the moment.
Covered Range Script
------- ----- ------
100.0% U+0000..U+007F C0 Controls and Basic Latin
100.0% U+0080..U+00FF C1 Controls and Latin-1 Supplement
100.0% U+0100..U+017F Latin Extended - A
100.0% U+0180..U+024F Latin Extended - B
100.0% U+0250..U+02AF IPA Extensions
100.0% U+02B0..U+02FF Spacing Modifier Letters
100.0% U+0300..U+036F Combining Diacritical Marks
100.0% U+0370..U+03FF Greek and Coptic
100.0% U+0400..U+04FF Cyrillic
100.0% U+0500..U+052F Cyrillic Supplement
100.0% U+0530..U+058F Armenian
100.0% U+0590..U+05FF Hebrew
100.0% U+0600..U+06FF Arabic
100.0% U+0700..U+074F Syriac
100.0% U+0750..U+077F Arabic Supplement
100.0% U+0780..U+07BF Thaana
100.0% U+07C0..U+07FF N'Ko
100.0% U+0800..U+083F Samaritan
100.0% U+0840..U+085F Mandaic
100.0% U+0860..U+089F Unassigned
100.0% U+08A0..U+08FF Arabic Extended - A
100.0% U+0900..U+097F Devanagari
100.0% U+0980..U+09FF Bengali
100.0% U+0A00..U+0A7F Gurmukhi
100.0% U+0A80..U+0AFF Gujarati
100.0% U+0B00..U+0B7F Oriya
100.0% U+0B80..U+0BFF Tamil
100.0% U+0C00..U+0C7F Telugu
100.0% U+0C80..U+0CFF Kannada
100.0% U+0D00..U+0D7F Malayalam
100.0% U+0D80..U+0DFF Sinhala
100.0% U+0E00..U+0E7F Thai
100.0% U+0E80..U+0EFF Lao
100.0% U+0F00..U+0FFF Tibetan
100.0% U+1000..U+109F Myanmar
100.0% U+10A0..U+10FF Georgian
100.0% U+1100..U+11FF Hangul Jamo
100.0% U+1200..U+137F Ethiopic
100.0% U+1380..U+139F Ethiopic Supplement
100.0% U+13A0..U+13FF Cherokee
100.0% U+1400..U+167F Unified Canadian Aboriginal Syllabics
100.0% U+1680..U+169F Ogham
100.0% U+16A0..U+16FF Runic
100.0% U+1700..U+171F Tagalog
100.0% U+1720..U+173F Hanunoo
100.0% U+1740..U+175F Buhid
100.0% U+1760..U+177F Tagbanwa
100.0% U+1780..U+17FF Khmer
100.0% U+1800..U+18AF Mongolian
100.0% U+18B0..U+18FF Unified Canadian Aboriginal Syllabics Extended
100.0% U+1900..U+194F Limbu
100.0% U+1950..U+197F Tai Le
100.0% U+1980..U+19DF New Tai Lue
100.0% U+19E0..U+19FF Khmer Symbols
100.0% U+1A00..U+1A1F Buginese
100.0% U+1A20..U+1AAF Tai Tham
100.0% U+1AB0..U+1AFF Combining Diacritical Marks Extended
100.0% U+1B00..U+1B7F Balinese
100.0% U+1B80..U+1BBF Sundanese
100.0% U+1BC0..U+1BFF Batak
100.0% U+1C00..U+1C4F Lepcha
100.0% U+1C50..U+1C7F Ol Chiki
100.0% U+1C80..U+1CBF Unassigned
100.0% U+1CC0..U+1CCF Sundanese Supplement
100.0% U+1CD0..U+1CFF Vedic Extensions
100.0% U+1D00..U+1D7F Phonetic Extensions
100.0% U+1D80..U+1DBF Phonetic Extensions Supplement
100.0% U+1DC0..U+1DFF Combining Diacritical Marks Supplement
100.0% U+1E00..U+1EFF Latin Extended Additional
100.0% U+1F00..U+1FFF Greek Extended
100.0% U+2000..U+206F General Punctuation
100.0% U+2070..U+209F Superscripts and Subscripts
100.0% U+20A0..U+20CF Currency Symbols
100.0% U+20D0..U+20FF Combining Diacritical Marks for Symbols
100.0% U+2100..U+214F Letterlike Symbols
100.0% U+2150..U+218F Number Forms
100.0% U+2190..U+21FF Arrows
100.0% U+2200..U+22FF Mathematical Operators
100.0% U+2300..U+23FF Miscellaneous Technical
100.0% U+2400..U+243F Control Pictures
100.0% U+2440..U+245F Optical Character Recognition
100.0% U+2460..U+24FF Enclosed Alphanumerics
100.0% U+2500..U+257F Box Drawing
100.0% U+2580..U+259F Block Elements
100.0% U+25A0..U+25FF Geometric Shapes
100.0% U+2600..U+26FF Miscellaneous Symbols
100.0% U+2700..U+27BF Dingbats
100.0% U+27C0..U+27EF Miscellaneous Mathematical Symbols - A
100.0% U+27F0..U+27FF Supplemental Arrows - A
100.0% U+2800..U+28FF Braille Patterns
100.0% U+2900..U+297F Supplemental Arrows - B
100.0% U+2980..U+29FF Miscellaneous Mathematical Symbols - B
100.0% U+2A00..U+2AFF Supplemental Mathematical Operators
100.0% U+2B00..U+2BFF Miscellaneous Symbols and Arrows
100.0% U+2C00..U+2C5F Glagolithic
100.0% U+2C60..U+2C7F Latin Extended C
100.0% U+2C80..U+2CFF Coptic
100.0% U+2D00..U+2D2F Georgian Supplement
100.0% U+2D30..U+2D7F Tifinagh
100.0% U+2D80..U+2DDF Ethiopic Extended
100.0% U+2DE0..U+2DFF Unassigned
100.0% U+2E00..U+2E7F Supplemental Punctuation
100.0% U+2E80..U+2EFF CJK Radicals Supplement
100.0% U+2F00..U+2FDF Kangxi Radicals
100.0% U+2FE0..U+2FEF Unassigned
100.0% U+2FF0..U+2FFF Ideographic Description Characters
100.0% U+3000..U+303F CJK Symbols and Punctuation
100.0% U+3040..U+309F Hiragana
100.0% U+30A0..U+30FF Katakana
100.0% U+3100..U+312F Bopomofo
100.0% U+3130..U+318F Hangul Compatibility Jamo
100.0% U+3190..U+319F Kanbun
100.0% U+31A0..U+31BF Bopomofo Extended
100.0% U+31C0..U+31EF CJK Strokes
100.0% U+31F0..U+31FF Katakana Phonetic Extensions
100.0% U+3200..U+32FF Enclosed CJK Letters and Months
100.0% U+3300..U+33FF CJK Compatibility
100.0% U+3400..U+4DBF CJK Unified Ideographs Extension A
100.0% U+4DC0..U+4DFF Yijing Hexagram Symbols
100.0% U+4E00..U+9FCF CJK Unified Ideographs
100.0% U+9FD0..U+9FFF Unassigned
100.0% U+A000..U+A48F Yi Syllables
100.0% U+A490..U+A4CF Yi Radicals
100.0% U+A4D0..U+A4FF Lisu
100.0% U+A500..U+A63F Vai
100.0% U+A640..U+A69F Unassigned
100.0% U+A6A0..U+A6FF Bamum
100.0% U+A700..U+A71F Modifier Tone Letters
100.0% U+A720..U+A7FF Latin Extended - D
100.0% U+A800..U+A82F Syloti Nagri
100.0% U+A830..U+A83F Common Indic Number Forms
100.0% U+A840..U+A87F Phags-pa
100.0% U+A880..U+A8DF Saurashtra
100.0% U+A8E0..U+A8FF Devanagari Extended
100.0% U+A900..U+A92F Kayah Li
100.0% U+A930..U+A95F Rejang
100.0% U+A960..U+A97F Hangul Jamo Extended - A
100.0% U+A980..U+A9DF Javanese
100.0% U+A9E0..U+A9FF Myanmar Extended - B
100.0% U+AA00..U+AA5F Cham
100.0% U+AA60..U+AA7F Myanmar Extended - A
100.0% U+AA80..U+AADF Tai Viet
100.0% U+AAE0..U+AAFF Meetei Mayek Extensions
100.0% U+AB00..U+AB2F Ethiopic Extended - A
100.0% U+AB30..U+AB6F Latin Extended - E
100.0% U+AB70..U+ABBF Cherokee Supplement
100.0% U+AB70..U+ABBF Unassigned
100.0% U+ABC0..U+ABFF Meetei Mayek
100.0% U+AC00..U+D7AF Hangul Syllables
100.0% U+D7B0..U+D7FF Hangul Jamo Extended - B
0.0% U+D800..U+DFFF Surrogate Pairs - Not Used
0.0% U+E000..U+F8FF Private Use Area - drawn but not included
100.0% U+F900..U+FAFF CJK Compatibility Ideographs
100.0% U+FB00..U+FB4F Alphabetic Presentation Forms
100.0% U+FB50..U+FDFF Arabic Presentation Forms - A
100.0% U+FE00..U+FE0F Variation Selectors
100.0% U+FE10..U+FE1F Vertical Forms
100.0% U+FE20..U+FE2F Combining Half Marks
100.0% U+FE30..U+FE4F CJK Compatibility Forms
100.0% U+FE50..U+FE6F Small Form Variants
100.0% U+FE70..U+FEFF Arabic Presentation Forms - B
100.0% U+FF00..U+FFEF Halfwidth and Fullwidth Forms
100.0% U+FFF0..U+FFFF Specials
Covered Range Script
------- ----- ------
100.0% U+010000..U+01007F Linear B Syllabary
100.0% U+010080..U+0100FF Linear B Ideograms
100.0% U+010100..U+01013F Aegean Numbers
100.0% U+010140..U+01018F Ancient Greek Numbers
100.0% U+010190..U+0101CF Ancient Symbols
100.0% U+0101D0..U+0101FF Phaistos Disc
100.0% U+010280..U+01029F Lycian
100.0% U+0102A0..U+0102DF Carian
100.0% U+0102E0..U+0102FF Coptic Epact Numbers
100.0% U+010300..U+01032F Old Italic
100.0% U+010330..U+01034F Gothic
100.0% U+010350..U+01037F Old Permic
100.0% U+010380..U+01039F Ugaritic
100.0% U+0103A0..U+0103DF Old Persian
100.0% U+010400..U+01044F Deseret
100.0% U+010450..U+01047F Shavian
100.0% U+010480..U+0104AF Osmanya
100.0% U+010500..U+01052F Elbasan
100.0% U+010530..U+01056F Caucasian Albanian
100.0% U+010600..U+01077F Linear A
100.0% U+010800..U+01083F Cypriot Syllabary
100.0% U+010840..U+01085F Imperial Aramaic
100.0% U+010860..U+01087F Palmyrene
100.0% U+010880..U+0108AF Nabataean
100.0% U+0108E0..U+0108FF Hatran
100.0% U+010900..U+01091F Phoenecian
100.0% U+010920..U+01093F Lydian
100.0% U+010980..U+01099F Meroitic Hieroglyphs
100.0% U+0109A0..U+0109FF Meroitic Cursive
100.0% U+010A00..U+010A5F Kharoshthi
100.0% U+010A60..U+010A7F Old South Arabian
100.0% U+010A80..U+010A9F Old North Arabian
100.0% U+010AC0..U+010AFF Manichaean
100.0% U+010B00..U+010B3F Avestan
100.0% U+010B40..U+010B5F Inscriptional Parthian
100.0% U+010B60..U+010B7F Inscriptional Pahlavi
100.0% U+010B80..U+010BAF Psalter Pahlavi
100.0% U+010C00..U+010C4F Old Turkic
100.0% U+010C80..U+010CFF Old Hungarian
100.0% U+010E60..U+010E7F Rumi Numeral Symbols
100.0% U+011000..U+01107F Brahmi
100.0% U+011080..U+0110CF Kaithi
100.0% U+0110D0..U+0110FF Sora Sompeng
100.0% U+011100..U+01114F Chakma
100.0% U+011150..U+01117F Mahajani
100.0% U+011180..U+0111DF Sharada
100.0% U+0111E0..U+0111FF Sinhala Archaic Numbers
100.0% U+011200..U+01124F Khojki
0.0% U+011280..U+0112AF Multani (Pending)
0.0% U+0112B0..U+0112FF Khudawadi (Pending)
0.0% U+011300..U+01137F Grantha (Pending)
0.0% U+011480..U+0114DF Tirhuta (Pending)
100.0% U+011580..U+0115FF Siddham
0.0% U+011600..U+01165F Modi (Pending)
100.0% U+011680..U+0116CF Takri
0.0% U+011700..U+01173F Ahom (Pending)
0.0% U+0118A0..U+0118FF Warang Citi (Pending)
0.0% U+011AC0..U+011AFF Pau Cin Hau (Pending)
0.0% U+012000..U+0123FF Cuneiform*
0.0% U+012400..U+01247F Cuneiform Numbers and Punctuation*
0.0% U+012480..U+01254F Early Dynastic Cuneiform
0.0% U+013000..U+01342F Egyptian Hieroglyphs*
0.0% U+016800..U+0168BF Bamum Supplement*
0.0% U+016A40..U+016A6F Mro (Pending)
0.0% U+016AD0..U+016AFF Bassa Vah (Pending)
100.0% U+016B00..U+016B8F Pahawh Hmong
100.0% U+016F00..U+016F9F Miao
100.0% U+01B000..U+01B0FF Kana Supplement
0.0% U+01BC00..U+01BC9F Duployan
100.0% U+01BCA0..U+01BCAF Shorthand Format Controls
100.0% U+01D000..U+01D0FF Byzantine Musical Symbols
100.0% U+01D100..U+01D1FF Musical Symbols
100.0% U+01D200..U+01D24F Ancient Greek Musical Notation
100.0% U+01D300..U+01D35F Tai Xuan Jing Symbols
100.0% U+01D360..U+01D37F Counting Rod Numerals
100.0% U+01D400..U+01D7FF Mathematical Alphanumeric Symbols (Pending)
0.0% U+01D800..U+01DAAF Sutton SignWriting
0.0% U+01E800..U+01E8DF Mende Kikakui (Pending)
100.0% U+01EE00..U+01EEFF Arabic Mathematical Alphabetic Symbols
100.0% U+01F000..U+01F02F Mahjong Tiles
100.0% U+01F030..U+01F09F Domino Tiles
100.0% U+01F0A0..U+01F0FF Playing Cards
100.0% U+01F100..U+01F1FF Enclosed Alphanumeric Supplement
100.0% U+01F200..U+01F2FF Enclosed Ideographic Supplement
100.0% U+01F300..U+01F5FF Miscellaneous Symbols and Pictographs
100.0% U+01F600..U+01F64F Emoticons
100.0% U+01F650..U+01F67F Ornamental Dingbats
100.0% U+01F680..U+01F6FF Transport and Map Symbols
100.0% U+01F700..U+01F77F Alchemical Symbols
100.0% U+01F780..U+01F7FF Geometric Shapes Extended
100.0% U+01F800..U+01F8FF Supplemental Arrows - C
0.0% U+01F900..U+01F9FF Supplemental Symbols and Pictographs
Emacs configures its fonts through fontsets. 'nough said?
Emacs comes with a sample file called HELLO that contains the word “hello” in some common scripts. You can display it with C-h h (press Ctrl+H then H). Even those are often not all provided by the same font. You can run M-x describe-fontset (Alt+X describe-fontset Enter) to see what fonts are used for what code points. If you work with less common scripts, you may need to modify the default fontset in your configuration file. The details are in the Emacs Lisp manual; if you can't figure it out, there's a whole Stack Exchange site where you can ask for help¹.
You may want to define multiple fontsets, e.g. one with maximum breadth for writing linguistics texts and one that's ASCII-only, fixed-width and taking up less screen real estate for programming. If you do this, bind the command mouse-set-font to a keystroke or to a mouse button combination, to make the switch easier.
For programming, Emacs has support for syntax highlighting, automatic indentation, build automation, identifier completion, documentation lookup and other nice features, some of it built in, some more advanced stuff through third-party packages.
Emacs is free and open source. There are official Windows binaries as well as several third-party distributions which may have nicer installers or useful bundled tools.
¹ Disclosure notice: I'm a moderator there.
