pickup compiler version from pragma

checks improved

support for fixed pragma version

range pragma handled

suggested changes

linting fix

load compiler before compilation too

if statement removed

using semver

nightly build support

linting fix

src/app/tabs/compileTab/compilerContainer.js

@@ -32,6 +32,9 @@ class CompilerContainer {
    * Update the compilation button with the name of the current file
    */
   set currentFile (name = '') {
+    if (name && name !== '') {
+      this._setCompilerVersionFromPragma(name)
+    }
     if (!this._view.compilationButton) return
     const button = this.compilationButton(name.split('/').pop())
     yo.update(this._view.compilationButton, button)
@@ -113,6 +116,23 @@ class CompilerContainer {
     return el
   }
 
+  _setCompilerVersionFromPragma (filename) {
+    this.compileTabLogic.fileManager.getFile(filename).then(data => {
+      const pragmaArr = data.match(/(pragma solidity (.+?);)/g)
+      if (pragmaArr && pragmaArr.length === 1) {
+        const pragmaStr = pragmaArr[0].replace('pragma solidity', '').trim()
+        const pragma = pragmaStr.substring(0, pragmaStr.length - 1)
+        const fixedVersions = this.data.allversions.filter(obj => !obj.prerelease).map(obj => obj.version)
+        const compilerToLoad = semver.maxSatisfying(fixedVersions, pragma)
+        const compilerPath = this.data.allversions.filter(obj => !obj.prerelease && obj.version === compilerToLoad)[0].path
+        if (this.data.selectedVersion !== compilerPath) {
+          this.data.selectedVersion = compilerPath
+          this._updateVersionSelector()
+        }
+      }
+    })
+  }
+
   _retrieveVersion () {
     let version = this._view.versionSelector.value
     return version.substring(9, version.length)
@@ -243,6 +263,9 @@ class CompilerContainer {
 
   compile (event) {
     if (this.config.get('currentFile')) {
+      if (!this.data.selectedVersion.includes('nightly')) {
+        this._setCompilerVersionFromPragma(this.config.get('currentFile'))
+      }
       this.compileTabLogic.runCompiler()
     }
   }