Modify scripts to stream terminal title changes (#1095)

* Modify scripts to stream terminal title changes

Adding the capabilities to signal terminal title changes based on the command that is being executed

* Fixes

* Review comments

* Update src/common-utils/devcontainer-feature.json
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Update src/common-utils/scripts/bash_theme_snippet.sh
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Update src/common-utils/scripts/rc_snippet.sh
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Remove RC

* Adding tests

* Update test/common-utils/scenarios.json

* Update src/common-utils/scripts/bash_theme_snippet.sh

* Test fixes

---------
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>
Co-authored-by: Samruddhi Khandale <skhandale@microsoft.com>

src/common-utils/devcontainer-feature.json

 {
     "id": "common-utils",
-    "version": "2.4.7",
+    "version": "2.5.0",
     "name": "Common Utilities",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/common-utils",
     "description": "Installs a set of common command line utilities, Oh My Zsh!, and sets up a non-root user.",

src/common-utils/scripts/bash_theme_snippet.sh

-
 # bash theme - partly inspired by https://github.com/ohmyzsh/ohmyzsh/blob/master/themes/robbyrussell.zsh-theme
 __bash_prompt() {
     local userpart='`export XIT=$? \
@@ -23,3 +22,23 @@ __bash_prompt() {
 }
 __bash_prompt
 export PROMPT_DIRTRIM=4
+
+# Check if the terminal is xterm
+if [[ "$TERM" == "xterm" ]]; then
+    # Function to set the terminal title to the current command
+    preexec() {
+        local cmd="${BASH_COMMAND}"
+        echo -ne "\033]0;${USER}@${HOSTNAME}: ${cmd}\007"
+    }
+
+    # Function to reset the terminal title to the shell type after the command is executed
+    precmd() {
+        echo -ne "\033]0;${USER}@${HOSTNAME}: ${SHELL}\007"
+    }
+
+    # Trap DEBUG signal to call preexec before each command
+    trap 'preexec' DEBUG
+
+    # Append to PROMPT_COMMAND to call precmd before displaying the prompt
+    PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND; }precmd"
+fi
\ No newline at end of file

src/common-utils/scripts/devcontainers.zsh-theme

@@ -24,3 +24,22 @@ __zsh_prompt() {
     unset -f __zsh_prompt
 }
 __zsh_prompt
+
+# Check if the terminal is xterm
+if [[ "$TERM" == "xterm" ]]; then
+    # Function to set the terminal title to the current command
+    preexec() {
+        local cmd=${1}
+        echo -ne "\033]0;${USER}@${HOSTNAME}: ${cmd}\007"
+    }
+
+    # Function to reset the terminal title to the shell type after the command is executed
+    precmd() {
+        echo -ne "\033]0;${USER}@${HOSTNAME}: ${SHELL}\007"
+    }
+
+    # Add the preexec and precmd functions to the corresponding hooks
+    autoload -Uz add-zsh-hook
+    add-zsh-hook preexec preexec
+    add-zsh-hook precmd precmd
+fi
\ No newline at end of file

src/common-utils/scripts/rc_snippet.sh

-
 if [ -z "${USER}" ]; then export USER=$(whoami); fi
 if [[ "${PATH}" != *"$HOME/.local/bin"* ]]; then export PATH="${PATH}:$HOME/.local/bin"; fi
 

test/common-utils/no-terminal-title-by-default.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+. /etc/os-release
+
+# Make sure bashrc is applied
+source /root/.bashrc
+
+check "check_term_is_not_set" test !"$TERM"
+check "check_prompt_command_not_set" test !"$PROMPT_COMMAND"
+
+# Report result
+reportResults
\ No newline at end of file

test/common-utils/scenarios.json

@@ -259,5 +259,20 @@
         "features": {
             "common-utils": {}
         }
+    },
+    "terminal-title-on-xterm": {
+        "image": "node",
+        "features": {
+            "common-utils": {}
+        },
+        "containerEnv": {
+            "TERM": "xterm"
+        }
+    },
+    "no-terminal-title-by-default": {
+        "image": "node",
+        "features": {
+            "common-utils": {}
+        }
     }
 }
\ No newline at end of file

test/common-utils/terminal-title-on-xterm.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+. /etc/os-release
+
+# Make sure bashrc is applied
+source /root/.bashrc
+
+check "check_term_is_set" test "$TERM" = "xterm"
+check "check_term_is_set" test "$PROMPT_COMMAND" = "precmd"
+
+# Report result
+reportResults
\ No newline at end of file