Improve file detection with signature check capabilities

This allows more complex detection upon regex rules for a certain amount of
lines.

internal/buffer/buffer.go

@@ -685,6 +685,16 @@ func (b *Buffer) UpdateRules() {
 	if ft == "off" {
 		return
 	}
+
+	// syntaxFileBuffer is a helper structure
+	// to store properties of one single syntax file
+	type syntaxFileBuffer struct {
+		header    *highlight.Header
+		fileName  string
+		syntaxDef *highlight.Def
+	}
+
+	syntaxFiles := []syntaxFileBuffer{}
 	syntaxFile := ""
 	foundDef := false
 	var header *highlight.Header
@@ -707,16 +717,21 @@ func (b *Buffer) UpdateRules() {
 			continue
 		}
 
-		if ((ft == "unknown" || ft == "") && highlight.MatchFiletype(header.FtDetect, b.Path, b.lines[0].data)) || header.FileType == ft {
+		if ((ft == "unknown" || ft == "") && header.MatchFileName(b.Path)) || header.FileType == ft {
 			syndef, err := highlight.ParseDef(file, header)
 			if err != nil {
 				screen.TermMessage("Error parsing syntax file " + f.Name() + ": " + err.Error())
 				continue
 			}
-			b.SyntaxDef = syndef
-			syntaxFile = f.Name()
 			foundDef = true
-			break
+
+			if header.FileType == ft {
+				b.SyntaxDef = syndef
+				syntaxFile = f.Name()
+				break
+			} else {
+				syntaxFiles = append(syntaxFiles, syntaxFileBuffer{header, f.Name(), syndef})
+			}
 		}
 	}
 
@@ -735,9 +750,8 @@ func (b *Buffer) UpdateRules() {
 		}
 
 		if ft == "unknown" || ft == "" {
-			if highlight.MatchFiletype(header.FtDetect, b.Path, b.lines[0].data) {
-				syntaxFile = f.Name()
-				break
+			if header.MatchFileName(b.Path) {
+				syntaxFiles = append(syntaxFiles, syntaxFileBuffer{header, f.Name(), nil})
 			}
 		} else if header.FileType == ft {
 			syntaxFile = f.Name()
@@ -745,6 +759,32 @@ func (b *Buffer) UpdateRules() {
 		}
 	}
 
+	if syntaxFile == "" {
+		length := len(syntaxFiles)
+		if length > 0 {
+			signatureMatch := false
+			if length > 1 {
+				for i := 0; i < length && !signatureMatch; i++ {
+					if syntaxFiles[i].header.HasFileSignature() {
+						for j := 0; j < 100 && !signatureMatch; j++ {
+							if syntaxFiles[i].header.MatchFileSignature(b.lines[j].data) {
+								syntaxFile = syntaxFiles[i].fileName
+								b.SyntaxDef = syntaxFiles[i].syntaxDef
+								header = syntaxFiles[i].header
+								signatureMatch = true
+							}
+						}
+					}
+				}
+			}
+			if length == 1 || !signatureMatch {
+				syntaxFile = syntaxFiles[0].fileName
+				b.SyntaxDef = syntaxFiles[0].syntaxDef
+				header = syntaxFiles[0].header
+			}
+		}
+	}
+
 	if syntaxFile != "" && !foundDef {
 		// we found a syntax file using a syntax header file
 		for _, f := range config.ListRuntimeFiles(config.RTSyntax) {

pkg/highlight/ftdetect.go

@@ -1,18 +0,0 @@
-package highlight
-
-import "regexp"
-
-// MatchFiletype will use the list of syntax definitions provided and the filename and first line of the file
-// to determine the filetype of the file
-// It will return the corresponding syntax definition for the filetype
-func MatchFiletype(ftdetect [2]*regexp.Regexp, filename string, firstLine []byte) bool {
-	if ftdetect[0] != nil && ftdetect[0].MatchString(filename) {
-		return true
-	}
-
-	if ftdetect[1] != nil {
-		return ftdetect[1].Match(firstLine)
-	}
-
-	return false
-}

pkg/highlight/parser.go

@@ -33,27 +33,26 @@ func (g Group) String() string {
 // Then it has the rules which define how to highlight the file
 type Def struct {
 	*Header
-
 	rules *rules
 }
 
 type Header struct {
-	FileType string
-	FtDetect [2]*regexp.Regexp
+	FileType       string
+	FileNameRegex  *regexp.Regexp
+	SignatureRegex *regexp.Regexp
 }
 
 type HeaderYaml struct {
 	FileType string `yaml:"filetype"`
 	Detect   struct {
-		FNameRgx  string `yaml:"filename"`
-		HeaderRgx string `yaml:"header"`
+		FNameRegexStr     string `yaml:"filename"`
+		SignatureRegexStr string `yaml:"signature"`
 	} `yaml:"detect"`
 }
 
 type File struct {
 	FileType string
-
-	yamlSrc map[interface{}]interface{}
+	yamlSrc  map[interface{}]interface{}
 }
 
 // A Pattern is one simple syntax rule
@@ -103,14 +102,14 @@ func MakeHeader(data []byte) (*Header, error) {
 	header := new(Header)
 	var err error
 	header.FileType = string(lines[0])
-	fnameRgx := string(lines[1])
-	headerRgx := string(lines[2])
+	fnameRegexStr := string(lines[1])
+	signatureRegexStr := string(lines[2])
 
-	if fnameRgx != "" {
-		header.FtDetect[0], err = regexp.Compile(fnameRgx)
+	if fnameRegexStr != "" {
+		header.FileNameRegex, err = regexp.Compile(fnameRegexStr)
 	}
-	if err == nil && headerRgx != "" {
-		header.FtDetect[1], err = regexp.Compile(headerRgx)
+	if err == nil && signatureRegexStr != "" {
+		header.SignatureRegex, err = regexp.Compile(signatureRegexStr)
 	}
 
 	if err != nil {
@@ -132,11 +131,11 @@ func MakeHeaderYaml(data []byte) (*Header, error) {
 	header := new(Header)
 	header.FileType = hdrYaml.FileType
 
-	if hdrYaml.Detect.FNameRgx != "" {
-		header.FtDetect[0], err = regexp.Compile(hdrYaml.Detect.FNameRgx)
+	if hdrYaml.Detect.FNameRegexStr != "" {
+		header.FileNameRegex, err = regexp.Compile(hdrYaml.Detect.FNameRegexStr)
 	}
-	if err == nil && hdrYaml.Detect.HeaderRgx != "" {
-		header.FtDetect[1], err = regexp.Compile(hdrYaml.Detect.HeaderRgx)
+	if err == nil && hdrYaml.Detect.SignatureRegexStr != "" {
+		header.SignatureRegex, err = regexp.Compile(hdrYaml.Detect.SignatureRegexStr)
 	}
 
 	if err != nil {
@@ -146,6 +145,29 @@ func MakeHeaderYaml(data []byte) (*Header, error) {
 	return header, nil
 }
 
+// MatchFileName will check the given file name with the stored regex
+func (header *Header) MatchFileName(filename string) bool {
+	if header.FileNameRegex != nil {
+		return header.FileNameRegex.MatchString(filename)
+	}
+
+	return false
+}
+
+// HasFileSignature checks the presence of a stored signature
+func (header *Header) HasFileSignature() bool {
+	return header.SignatureRegex != nil
+}
+
+// MatchFileSignature will check the given line with the stored regex
+func (header *Header) MatchFileSignature(line []byte) bool {
+	if header.SignatureRegex != nil {
+		return header.SignatureRegex.Match(line)
+	}
+
+	return false
+}
+
 func ParseFile(input []byte) (f *File, err error) {
 	// This is just so if we have an error, we can exit cleanly and return the parse error to the user
 	defer func() {

runtime/help/colors.md

@@ -267,13 +267,13 @@ detect:
 ```
 
 Micro will match this regex against a given filename to detect the filetype.
-You may also provide an optional `header` regex that will check the first line
-of the file. For example:
+You may also provide an optional `signature` regex that will check a certain
+amount of lines of a file to find specific marks. For example:
 
 ```
 detect:
     filename: "\\.ya?ml$"
-    header: "%YAML"
+    signature: "%YAML"
 ```
 
 ### Syntax rules

runtime/syntax/PowerShell.yaml

@@ -5,7 +5,7 @@ filetype: powershell
 
 detect:
     filename: "\\.ps(1|m1|d1)$"
-    #header: ""
+    #signature: ""
 
 rules:
     # - comment.block:           # Block Comment

runtime/syntax/README.md

@@ -2,7 +2,7 @@
 
 Here are micro's syntax files.
 
-Each yaml file specifies how to detect the filetype based on file extension or headers (first line of the file).
+Each yaml file specifies how to detect the filetype based on file extension or given signature. The signature can be matched to a maximum of 100 lines (to limit parse times) for a best "guess".
 Then there are patterns and regions linked to highlight groups which tell micro how to highlight that filetype.
 
 Making your own syntax files is very simple. I recommend you check the file after you are finished with the

runtime/syntax/awk.yaml

@@ -2,7 +2,7 @@ filetype: awk
 
 detect:
     filename: "\\.awk$"
-    header: "^#!.*bin/(env +)?awk( |$)"
+    signature: "^#!.*bin/(env +)?awk( |$)"
 
 rules:
     - preproc: "\\$[A-Za-z0-9_!@#$*?\\-]+"

runtime/syntax/bat.yaml

@@ -2,7 +2,7 @@ filetype: batch
 
 detect:
   filename: "(\\.bat$|\\.cmd$)"
-  # header: ""
+  # signature: ""
 
 rules:
   # Numbers

runtime/syntax/crontab.yaml

@@ -2,7 +2,7 @@ filetype: crontab
 
 detect:
     filename: "crontab$"
-    header: "^#.*?/etc/crontab"
+    signature: "^#.*?/etc/crontab"
 
 rules:
       #              The time and date fields are:

runtime/syntax/csx.yaml

@@ -1,7 +1,7 @@
 filetype: csharp-script
 detect:
     filename: "\\.csx$"
-    header: "^#!.*/(env +)?dotnet-script( |$)"
+    signature: "^#!.*/(env +)?dotnet-script( |$)"
     
 rules:
     - include: "csharp"

runtime/syntax/fish.yaml

@@ -2,7 +2,7 @@ filetype: fish
 
 detect:
     filename: "\\.fish$"
-    header: "^#!.*/(env +)?fish( |$)"
+    signature: "^#!.*/(env +)?fish( |$)"
 
 rules:
       # Numbers

runtime/syntax/godoc.yaml

@@ -5,7 +5,7 @@ filetype: godoc
 
 detect:
     filename: "\\.godoc$"
-    header: package.*import
+    signature: package.*import
 
 rules:
     - preproc: "^[^ ].*"

runtime/syntax/groovy.yaml

@@ -2,7 +2,7 @@ filetype: groovy
 
 detect:
     filename: "(\\.(groovy|gy|gvy|gsh|gradle)$|^[Jj]enkinsfile$)"
-    header: "^#!.*/(env +)?groovy *$"
+    signature: "^#!.*/(env +)?groovy *$"
 
 rules:
     # And the style guide for constants is CONSTANT_CASE

runtime/syntax/html4.yaml

@@ -2,7 +2,7 @@ filetype: html4
 
 detect:
     filename: "\\.htm[l]?4$"
-    header: "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN|http://www.w3.org/TR/html4/strict.dtd\">"
+    signature: "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN|http://www.w3.org/TR/html4/strict.dtd\">"
 
 rules:
     - error: "<[^!].*?>"

runtime/syntax/html5.yaml

@@ -2,7 +2,7 @@ filetype: html5
 
 detect:
     filename: "\\.htm[l]?5$"
-    header: "<!DOCTYPE html5>"
+    signature: "<!DOCTYPE html5>"
 
 rules:
     - error: "<[^!].*?>"

runtime/syntax/javascript.yaml

@@ -2,7 +2,7 @@ filetype: javascript
 
 detect:
     filename: "(\\.js$|\\.es[5678]?$|\\.mjs$)"
-    header: "^#!.*/(env +)?node( |$)"
+    signature: "^#!.*/(env +)?node( |$)"
 
 rules:
     - constant.number: "\\b[-+]?([1-9][0-9]*|0[0-7]*|0x[0-9a-fA-F]+)([uU][lL]?|[lL][uU]?)?\\b"

runtime/syntax/json.yaml

@@ -2,7 +2,7 @@ filetype: json
 
 detect:
     filename: "\\.json$"
-    header: "^\\{$"
+    signature: "^\\{$"
 
 rules:
     - constant.number: "\\b[-+]?([1-9][0-9]*|0[0-7]*|0x[0-9a-fA-F]+)([uU][lL]?|[lL][uU]?)?\\b"

runtime/syntax/julia.yaml

@@ -2,7 +2,7 @@ filetype: julia
 
 detect:
     filename: "\\.jl$"
-    header: "^#!.*/(env +)?julia( |$)"
+    signature: "^#!.*/(env +)?julia( |$)"
 
 rules:
 

runtime/syntax/justfile.yaml

@@ -3,7 +3,7 @@ filetype: 'justfile'
 
 detect:
     filename: "(^\\.?[Jj]ustfile|\\.just)$"
-    header: "^#!.*/(env +)?[bg]?just --justfile"
+    signature: "^#!.*/(env +)?[bg]?just --justfile"
 
 rules:
     - preproc: "\\<(ifeq|ifdef|ifneq|ifndef|else|endif)\\>"

runtime/syntax/mail.yaml

@@ -2,7 +2,7 @@ filetype: mail
 
 detect:
     filename: "(.*/mutt-.*|\\.eml)$"
-    header: "^From .* \\d+:\\d+:\\d+ \\d+"
+    signature: "^From .* \\d+:\\d+:\\d+ \\d+"
 
 rules:
     - type: "^From .*"

runtime/syntax/make_headers.go

@@ -1,4 +1,5 @@
-//+build ignore
+//go:build ignore
+// +build ignore
 
 package main
 
@@ -16,15 +17,15 @@ import (
 type HeaderYaml struct {
 	FileType string `yaml:"filetype"`
 	Detect   struct {
-		FNameRgx  string `yaml:"filename"`
-		HeaderRgx string `yaml:"header"`
+		FNameRgx     string `yaml:"filename"`
+		SignatureRgx string `yaml:"signature"`
 	} `yaml:"detect"`
 }
 
 type Header struct {
-	FileType  string
-	FNameRgx  string
-	HeaderRgx string
+	FileType     string
+	FNameRgx     string
+	SignatureRgx string
 }
 
 func main() {
@@ -58,7 +59,7 @@ func encode(name string, c HeaderYaml) {
 	f, _ := os.Create(name + ".hdr")
 	f.WriteString(c.FileType + "\n")
 	f.WriteString(c.Detect.FNameRgx + "\n")
-	f.WriteString(c.Detect.HeaderRgx + "\n")
+	f.WriteString(c.Detect.SignatureRgx + "\n")
 	f.Close()
 }
 
@@ -69,7 +70,7 @@ func decode(name string) Header {
 	var hdr Header
 	hdr.FileType = string(strs[0])
 	hdr.FNameRgx = string(strs[1])
-	hdr.HeaderRgx = string(strs[2])
+	hdr.SignatureRgx = string(strs[2])
 	fmt.Printf("took %v\n", time.Since(start))
 
 	return hdr

runtime/syntax/makefile.yaml

@@ -2,7 +2,7 @@ filetype: makefile
 
 detect:
     filename: "([Mm]akefile|\\.ma?k)$"
-    header: "^#!.*/(env +)?[bg]?make( |$)"
+    signature: "^#!.*/(env +)?[bg]?make( |$)"
 
 rules:
     - preproc: "\\<(ifeq|ifdef|ifneq|ifndef|else|endif)\\>"

runtime/syntax/nginx.yaml

@@ -2,7 +2,7 @@ filetype: nginx
 
 detect: 
     filename: "nginx.*\\.conf$|\\.nginx$"
-    header: "^(server|upstream)[a-z ]*\\{$"
+    signature: "^(server|upstream)[a-z ]*\\{$"
 
 rules:
     - preproc: "\\b(events|server|http|location|upstream)[[:space:]]*\\{"

runtime/syntax/patch.yaml

@@ -2,7 +2,7 @@ filetype: patch
 
 detect:
     filename: "\\.(patch|diff)$"
-    header: "^diff"
+    signature: "^diff"
 
 rules:
     - brightgreen: "^\\+.*"

runtime/syntax/perl.yaml

@@ -2,7 +2,7 @@ filetype: perl
 
 detect: 
     filename: "\\.p[lmp]$"
-    header: "^#!.*/(env +)?perl( |$)"
+    signature: "^#!.*/(env +)?perl( |$)"
 
 rules:
     - type: "\\b(accept|alarm|atan2|bin(d|mode)|c(aller|homp|h(dir|mod|op|own|root)|lose(dir)?|onnect|os|rypt)|d(bm(close|open)|efined|elete|ie|o|ump)|e(ach|of|val|x(ec|ists|it|p))|f(cntl|ileno|lock|ork))\\b|\\b(get(c|login|peername|pgrp|ppid|priority|pwnam|(host|net|proto|serv)byname|pwuid|grgid|(host|net)byaddr|protobynumber|servbyport)|([gs]et|end)(pw|gr|host|net|proto|serv)ent|getsock(name|opt)|gmtime|goto|grep|hex|index|int|ioctl|join)\\b|\\b(keys|kill|last|length|link|listen|local(time)?|log|lstat|m|mkdir|msg(ctl|get|snd|rcv)|next|oct|open(dir)?|ord|pack|pipe|pop|printf?|push|q|qq|qx|rand|re(ad(dir|link)?|cv|say|do|name|quire|set|turn|verse|winddir)|rindex|rmdir|s|scalar|seek(dir)?)\\b|\\b(se(lect|mctl|mget|mop|nd|tpgrp|tpriority|tsockopt)|shift|shm(ctl|get|read|write)|shutdown|sin|sleep|socket(pair)?|sort|spli(ce|t)|sprintf|sqrt|srand|stat|study|substr|symlink|sys(call|read|tem|write)|tell(dir)?|time|tr(y)?|truncate|umask)\\b|\\b(un(def|link|pack|shift)|utime|values|vec|wait(pid)?|wantarray|warn|write)\\b"

runtime/syntax/python2.yaml

@@ -2,7 +2,7 @@ filetype: python2
 
 detect:
     filename: "\\.py2$"
-    header: "^#!.*/(env +)?python2$"
+    signature: "^#!.*/(env +)?python2$"
 
 rules:
 

runtime/syntax/python3.yaml

@@ -2,7 +2,7 @@ filetype: python
 
 detect:
     filename: "\\.py(3)?$"
-    header: "^#!.*/(env +)?python(3)?$"
+    signature: "^#!.*/(env +)?python(3)?$"
 
 rules:
     # built-in objects

runtime/syntax/ruby.yaml

@@ -2,7 +2,7 @@ filetype: ruby
 
 detect: 
     filename: "\\.(rb|rake|gemspec)$|^(.*[\\/])?(Gemfile|config.ru|Rakefile|Capfile|Vagrantfile|Guardfile|Appfile|Fastfile|Pluginfile|Podfile|\\.?[Bb]rewfile)$"
-    header: "^#!.*/(env +)?ruby( |$)"
+    signature: "^#!.*/(env +)?ruby( |$)"
 
 rules:
     - comment.bright:

runtime/syntax/sage.yaml

@@ -2,7 +2,7 @@ filetype: sage
 
 detect:
     filename: "\\.sage$"
-    header: "^#!.*/(env +)?sage( |$)"
+    signature: "^#!.*/(env +)?sage( |$)"
 
 rules:
 

runtime/syntax/sed.yaml

@@ -2,7 +2,7 @@ filetype: sed
 
 detect: 
     filename: "\\.sed$"
-    header: "^#!.*bin/(env +)?sed( |$)"
+    signature: "^#!.*bin/(env +)?sed( |$)"
 
 rules:
     - symbol.operator: "[|^$.*+]"

runtime/syntax/sh.yaml

@@ -24,7 +24,7 @@ filetype: shell
 # * bash-fc. (followed by a random string)
 detect:
     filename: "(\\.(sh|bash|ash|ebuild)$|(\\.bash(rc|_aliases|_functions|_profile)|\\.?profile|Pkgfile|pkgmk\\.conf|rc\\.conf|PKGBUILD|APKBUILD)$|bash-fc\\.)"
-    header: "^#!.*/(env +)?(ba)?(a)?(mk)?sh( |$)"
+    signature: "^#!.*/(env +)?(ba)?(a)?(mk)?sh( |$)"
 
 rules:
     # Numbers

runtime/syntax/syntax_converter.go

@@ -137,7 +137,7 @@ func generateFile(filetype, syntax, header string, rules []interface{}) string {
 	output += fmt.Sprintf("detect: \n    filename: \"%s\"\n", strings.Replace(strings.Replace(syntax, "\\", "\\\\", -1), "\"", "\\\"", -1))
 
 	if header != "" {
-		output += fmt.Sprintf("    header: \"%s\"\n", strings.Replace(strings.Replace(header, "\\", "\\\\", -1), "\"", "\\\"", -1))
+		output += fmt.Sprintf("    signature: \"%s\"\n", strings.Replace(strings.Replace(header, "\\", "\\\\", -1), "\"", "\\\"", -1))
 	}
 
 	output += "\nrules:\n"

runtime/syntax/systemd.yaml

@@ -2,7 +2,7 @@ filetype: systemd
 
 detect:
     filename: "\\.(service|socket|timer)$"
-    header: "^\\[Unit\\]$"
+    signature: "^\\[Unit\\]$"
 
 rules:
     - statement: "^(Accept|After|Alias|AllowIsolate|Also|ANSI_COLOR|_AUDIT_LOGINUID|_AUDIT_SESSION|Backlog|Before|BindIPv6Only|BindsTo|BindToDevice|BlockIOReadBandwidth|BlockIOWeight|BlockIOWriteBandwidth|_BOOT_ID|Broadcast|BUG_REPORT_URL|BusName|Capabilities|CapabilityBoundingSet|CHASSIS|cipher|class|_CMDLINE|CODE_FILE|CODE_FUNC|CODE_LINE|_COMM|Compress|ConditionACPower|ConditionCapability|ConditionDirectoryNotEmpty|ConditionFileIsExecutable|ConditionFileNotEmpty|ConditionHost|ConditionKernelCommandLine|ConditionNull|ConditionPathExists|ConditionPathExistsGlob|ConditionPathIsDirectory|ConditionPathIsMountPoint|ConditionPathIsReadWrite|ConditionPathIsSymbolicLink|ConditionSecurity|ConditionVirtualization|Conflicts|ControlGroup|ControlGroupAttribute|ControlGroupModify|ControlGroupPersistent|controllers|Controllers|CPE_NAME|CPUAffinity|CPUSchedulingPolicy|CPUSchedulingPriority|CPUSchedulingResetOnFork|CPUShares|CrashChVT|CrashShell|__CURSOR|debug|DefaultControllers|DefaultDependencies|DefaultLimitAS|DefaultLimitCORE|DefaultLimitCPU|DefaultLimitDATA|DefaultLimitFSIZE|DefaultLimitLOCKS|DefaultLimitMEMLOCK|DefaultLimitMSGQUEUE|DefaultLimitNICE|DefaultLimitNOFILE|DefaultLimitNPROC|DefaultLimitRSS|DefaultLimitRTPRIO|DefaultLimitRTTIME|DefaultLimitSIGPENDING|DefaultLimitSTACK|DefaultStandardError|DefaultStandardOutput|Description|DeviceAllow|DeviceDeny|DirectoryMode|DirectoryNotEmpty|Documentation|DumpCore|entropy|Environment|EnvironmentFile|ERRNO|event_timeout|_EXE|ExecReload|ExecStart|ExecStartPost|ExecStartPre|ExecStop|ExecStopPost|ExecStopPre|filter|FONT|FONT_MAP|FONT_UNIMAP|ForwardToConsole|ForwardToKMsg|ForwardToSyslog|FreeBind|freq|FsckPassNo|fstab|_GID|Group|GuessMainPID|HandleHibernateKey|HandleLidSwitch|HandlePowerKey|HandleSuspendKey|hash|HibernateKeyIgnoreInhibited|HOME_URL|_HOSTNAME|ICON_NAME|ID|IdleAction|IdleActionSec|ID_LIKE|ID_MODEL|ID_MODEL_FROM_DATABASE|IgnoreOnIsolate|IgnoreOnSnapshot|IgnoreSIGPIPE|InaccessibleDirectories|InhibitDelayMaxSec|init|IOSchedulingClass|IOSchedulingPriority|IPTOS|IPTTL|JobTimeoutSec|JoinControllers|KeepAlive|KEYMAP|KEYMAP_TOGGLE|KillExcludeUsers|KillMode|KillOnlyUsers|KillSignal|KillUserProcesses|LidSwitchIgnoreInhibited|LimitAS|LimitCORE|LimitCPU|LimitDATA|LimitFSIZE|LimitLOCKS|LimitMEMLOCK|LimitMSGQUEUE|LimitNICE|LimitNOFILE|LimitNPROC|LimitRSS|LimitRTPRIO|LimitRTTIME|LimitSIGPENDING|LimitSTACK|link_priority|valueListenDatagram|ListenFIFO|ListenMessageQueue|ListenNetlink|ListenSequentialPacket|ListenSpecial|ListenStream|LogColor|LogLevel|LogLocation|LogTarget|luks|_MACHINE_ID|MakeDirectory|Mark|MaxConnections|MaxFileSec|MaxLevelConsole|MaxLevelKMsg|MaxLevelStore|MaxLevelSyslog|MaxRetentionSec|MemoryLimit|MemorySoftLimit|MESSAGE|MESSAGE_ID|MessageQueueMaxMessages|MessageQueueMessageSize|__MONOTONIC_TIMESTAMP|MountFlags|NAME|NAutoVTs|Nice|NonBlocking|NoNewPrivileges|NotifyAccess|OnActiveSec|OnBootSec|OnCalendar|OnFailure|OnFailureIsolate|OnStartupSec|OnUnitActiveSec|OnUnitInactiveSec|OOMScoreAdjust|Options|output|PAMName|PartOf|PassCredentials|PassSecurity|PathChanged|PathExists|PathExistsGlob|PathModified|PermissionsStartOnly|_PID|PIDFile|PipeSize|PowerKeyIgnoreInhibited|PRETTY_HOSTNAME|PRETTY_NAME|Priority|PRIORITY|PrivateNetwork|PrivateTmp|PropagatesReloadTo|pss|RateLimitBurst|RateLimitInterval|ReadOnlyDirectories|ReadWriteDirectories|__REALTIME_TIMESTAMP|ReceiveBuffer|RefuseManualStart|RefuseManualStop|rel|ReloadPropagatedFrom|RemainAfterExit|RequiredBy|Requires|RequiresMountsFor|RequiresOverridable|Requisite|RequisiteOverridable|ReserveVT|ResetControllers|Restart|RestartPreventExitStatus|RestartSec|RootDirectory|RootDirectoryStartOnly|RuntimeKeepFree|RuntimeMaxFileSize|RuntimeMaxUse|RuntimeWatchdogSec|samples|scale_x|scale_y|Seal|SecureBits|_SELINUX_CONTEXT|SendBuffer|SendSIGKILL|Service|ShowStatus|ShutdownWatchdogSec|size|SmackLabel|SmackLabelIPIn|SmackLabelIPOut|SocketMode|Sockets|SourcePath|_SOURCE_REALTIME_TIMESTAMP|SplitMode|StandardError|StandardInput|StandardOutput|StartLimitAction|StartLimitBurst|StartLimitInterval|static_node|StopWhenUnneeded|Storage|string_escape|none|replaceSuccessExitStatus|SupplementaryGroups|SUPPORT_URL|SuspendKeyIgnoreInhibited|SyslogFacility|SYSLOG_FACILITY|SyslogIdentifier|SYSLOG_IDENTIFIER|SyslogLevel|SyslogLevelPrefix|SYSLOG_PID|SystemCallFilter|SYSTEMD_ALIAS|_SYSTEMD_CGROUP|_SYSTEMD_OWNER_UID|SYSTEMD_READY|_SYSTEMD_SESSION|_SYSTEMD_UNIT|_SYSTEMD_USER_UNIT|SYSTEMD_WANTS|SystemKeepFree|SystemMaxFileSize|SystemMaxUse|SysVStartPriority|TCPCongestion|TCPWrapName|timeout|TimeoutSec|TimeoutStartSec|TimeoutStopSec|TimerSlackNSec|Transparent|_TRANSPORT|tries|TTYPath|TTYReset|TTYVHangup|TTYVTDisallocate|Type|_UID|UMask|Unit|User|UtmpIdentifier|VERSION|VERSION_ID|WantedBy|Wants|WatchdogSec|What|Where|WorkingDirectory)="

runtime/syntax/tcl.yaml

@@ -2,7 +2,7 @@ filetype: tcl
 
 detect:
     filename: "\\.tcl$"
-    header: "^#!.*/(env +)?tclsh( |$)"
+    signature: "^#!.*/(env +)?tclsh( |$)"
 
 rules:
     - statement: "\\b(after|append|array|auto_execok|auto_import|auto_load|auto_load_index|auto_qualify|binary|break|case|catch|cd|clock|close|concat|continue|else|elseif|encoding|eof|error|eval|exec|exit|expr|fblocked|fconfigure|fcopy|file|fileevent|flush|for|foreach|format|gets|glob|global|history|if|incr|info|interp|join|lappend|lindex|linsert|list|llength|load|lrange|lreplace|lsearch|lset|lsort|namespace|open|package|pid|puts|pwd|read|regexp|regsub|rename|return|scan|seek|set|socket|source|split|string|subst|switch|tclLog|tell|time|trace|unknown|unset|update|uplevel|upvar|variable|vwait|while)\\b"

runtime/syntax/xml.yaml

@@ -2,7 +2,7 @@ filetype: xml
 
 detect:
     filename: "\\.(xml|sgml?|rng|svg|plist)$"
-    header: "<\\?xml.*\\?>"
+    signature: "<\\?xml.*\\?>"
 
 rules:
     - preproc:

runtime/syntax/yaml.yaml

@@ -2,7 +2,7 @@ filetype: yaml
 
 detect:
     filename: "\\.ya?ml$"
-    header: "%YAML"
+    signature: "%YAML"
 
 rules:
     - type: "(^| )!!(binary|bool|float|int|map|null|omap|seq|set|str) "

runtime/syntax/zsh.yaml

@@ -2,7 +2,7 @@ filetype: zsh
 
 detect:
     filename: "(\\.zsh$|\\.?(zshenv|zprofile|zshrc|zlogin|zlogout)$)"
-    header: "^#!.*/(env +)?zsh( |$)"
+    signature: "^#!.*/(env +)?zsh( |$)"
 
 rules:
     ## Numbers