Accept standard input such as via the pipe character!

changelog.md

@@ -3,12 +3,22 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+
+## [git] - 2020-03-13
+### Added
+- Accept standard input such as by piping from another program!
+
+### Changed
+- Instead of dialog boxes regarding missing input, show lines in the
+
+
 ## [git] - 2020-03-13
 ### Added
 - Run the script as a user not named "root" to install to use the
   prefix ~/.local (if the `PREFIX` environment variable is not
   specified)
 
+
 ## [1.2.0] - 2020-03-12
 ### Added
 - Handle Minetest Lua Warnings.

main.cpp

@@ -1,9 +1,14 @@
 #include "mainwindow.h"
 #include <QApplication>
 #include <QDebug>
+#include <iostream>
 
 int main(int argc, char *argv[])
 {
+    std::cin.sync_with_stdio(false); /**< Stop in_avail from always being 0
+                                          (See <https://stackoverflow.com/
+                                            questions/17474252/
+        why-does-in-avail-output-zero-even-if-the-stream-has-some-char) */
     QApplication a(argc, argv);
     MainWindow w;
     QString sErrorsListFileName; //reverts to err.txt if left blank

mainwindow.cpp

@@ -9,7 +9,7 @@
 #include <QString>
 #include <QTextStream>
 #include <QThread>
-
+#include <iostream>
 int iErrors = 0;
 int iWarnings = 0;
 int iTODOs = 0;
@@ -336,6 +336,7 @@ bool MainWindow::isFatalSourceError(QString sErrStreamLine)
 
 MainWindow::~MainWindow()
 {
+    delete this->inTimer;
     delete ui;
 }
 void MainWindow::init(QString errorsListFileName)
@@ -402,15 +403,28 @@ void MainWindow::init(QString errorsListFileName)
                 }
             }
         } else {
-            QString my_path = QCoreApplication::applicationFilePath();
-            QMessageBox::information(this, "Output Inspector - Help", my_path + ": Output Inspector cannot read the output file due to permissions or other read error (tried \"./" + errorsListFileName + "\").");
+            if (std::cin.rdbuf()->in_avail() < 1) {
+                QString my_path = QCoreApplication::applicationFilePath();
+                QString title = "Output Inspector - Help";
+                QString msg = my_path + ": Output Inspector cannot read the output file due to permissions or other read error (tried \"./" + errorsListFileName + "\").";
+                QMessageBox::information(this, title, msg);
+                // this->addLine(title + ":" + msg, true);
+            }
         }
     } // end if could open file named errorsListFileName
     else {
-        QString my_path = QCoreApplication::applicationFilePath();
-        QMessageBox::information(this, "Output Inspector - Help", my_path + ": Output Inspector cannot find the output file to process (tried \"./" + errorsListFileName + "\").");
+        if (std::cin.rdbuf()->in_avail() < 1) {
+            QString my_path = QCoreApplication::applicationFilePath();
+            QString title = "Output Inspector - Help";
+            QString msg = my_path + ": Output Inspector cannot find the output file to process (tried \"./" + errorsListFileName + "\").";
+            QMessageBox::information(this, title, msg);
+            // this->addLine(title + ":" + msg, true);
+        }
     }
-
+    this->inTimer = new QTimer(this);
+    this->inTimer->setInterval(500);  // milliseconds
+    connect(this->inTimer, SIGNAL(timeout()), this, SLOT(readInput()));
+    this->inTimer->start();
 } // end init
 
 /**
@@ -1234,4 +1248,32 @@ void MainWindow::on_mainListWidget_itemDoubleClicked(QListWidgetItem* item)
             qInfo().noquote() << "ERROR: '" + sErr + "'";
         }
     }
+}
+
+void MainWindow::readInput()
+{
+    int limit = 50;
+    int count = 0;
+    std::string line = " ";
+    while (count < limit && !line.empty()) {
+        std::streamsize size = std::cin.rdbuf()->in_avail();
+        if (size < 1) {
+            // qInfo().noquote() << "OutputInspector: There is no input: got " << size;
+            // Prevent waiting forever for a line.
+            break;
+        }
+        std::getline(std::cin, line);
+        if (!std::cin.eof()) {
+            // qInfo().noquote() << "OutputInspector: input is '" << line.c_str() << "'.";
+            // this->addLine(QString("OutputInspector: input is: ") + QString::fromStdString(line), true);
+            this->addLine(QString::fromStdString(line), true);
+        }
+        else {
+            // qInfo().noquote() << "OutputInspector: input has ended.";
+            // this->addLine("# OutputInspector: input has ended.", true);
+            break;
+        }
+        count++;
+    }
+
 } // end MainWindow::on_mainListWidget_itemDoubleClicked

mainwindow.h

@@ -3,6 +3,7 @@
 
 #include <QMainWindow>
 #include <QListWidgetItem>
+#include <QTimer>
 // #include <map>
 
 
@@ -77,6 +78,7 @@ class MainWindow : public QMainWindow
 
 private slots:
     void on_mainListWidget_itemDoubleClicked(QListWidgetItem *item);
+    void readInput();
 
 private:
     Ui::MainWindow *ui;
@@ -104,6 +106,8 @@ private slots:
     QString m_ActualJumpColumn;
 
     void pushWarnings(); /**< Push warnings to the GUI. */
+
+    QTimer* inTimer; /**< Read standard input lines regularly **/
 };
 
 #endif // MAINWINDOW_H

readme.md

@@ -5,6 +5,7 @@ After using your compiler/linting tool, you can now double-click an error or
 warning to jump (using Kate or Geany line,col jump feature) to the file and line
 of code having the issue (see Usage below).
 
+
 ## Features
 * Jumps to source line if you double-click error
 * Color codes lines in your output (red: error; orange: warning; yellow: issue in installed library used [if in site-packages]; black: formatting marks; gray: unrecognized information)
@@ -13,38 +14,33 @@ of code having the issue (see Usage below).
   * inline comment mark is determined from file extension: py, pyw, sh, c, h, cpp, hpp, js, java, php, bat, command
 * Installs passthrough-outputinspector for use in IDEs (see Usage)
 
-## Formats
-So far, compilers/linters with the following output format is readable as input
-for outputinspector (see Usage for specific cases):
-```
-foo.js: line 1, col 10, reason
-```
-or
-```
-foo.py:20:29: reason
-```
-or
-```
-foo.cs(1,10): reason
-```
-or\
-**nosetests** (no column, with parenthesis or not, terminated with comma or
-newline)
 
 ## Usage
-* For automatic usage on Linux, create a build command in Geany:
-  * "Build," "Set Build Commands"
-  * Set Execute (or an empty box under "Independent commands") to:\
-    `passthrough-outputinspector python3 "%f"`\
-    (if you set the Execute command, the gear button will run
-    passthrough-outputinspector and then the button will turn into a stop button
-    and be able to stop both passthrough-outputinspector and outputinspector)
-    * You can send up to 7 additional params as passthrough-outputinspector
-      checks for that many. Example:\
+Before first use, make sure kate or geany package is installed (run
+install script again if wasn't when install script ran--it recreates
+the config based on detecting kate's location if you enter y for yes).
+
+### Piping
+You can pipe output from another program to get near-realtime (depending
+on your OS's implementation of piping) results without using files.
+
+To get error output, run: `... 2>&1 >/dev/null | outputinspector`;
+otherwise, simply run: `... | outputinspector`
+(where "..." is your program).
+
+### GUI-based use
+For automatic usage on Linux, create a build command in Geany:
+* "Build," "Set Build Commands"
+* Set Execute (or an empty box under "Independent commands") to:\
+  `passthrough-outputinspector python3 "%f"`\
+  (if you set the Execute command, the gear button will run
+  passthrough-outputinspector and then the button will turn into a stop button
+  and be able to stop both passthrough-outputinspector and outputinspector)
+  * You can send up to 7 additional params as passthrough-outputinspector
+    checks for that many. Example:\
     `passthrough-outputinspector python3 "%f" --ExitOnNoErrors=no`
-* make sure kate or geany package is installed (run install script again if
-wasn't when install script ran--it recreates the config based on detecting
-kate's location if you enter y for yes)
+
+### Specific Uses
 * For py file linting: you can use pycodestyle (tested with pycodestyle-3
 command--package may be named python3-pycodestyle in your Linux distro):
 ```