cli: add output filename suffix for fitprint and fitdump (#214)

cmd/fitdump/README.md

@@ -1,4 +1,4 @@
-# Fitdump
+# FIT Dump CLI
 
 Fitdump dumps the FIT file(s) into segmented bytes.
 
@@ -14,8 +14,33 @@ message_data        | 1|  00000001  [1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
 
 ## Usage
 
+### Run
+
 ```sh
 go run main.go triathlon_summary_last.fit
 
-# dumped: "triathlon_summary_last.fit" -> "triathlon_summary_last.txt"
+# FIT dumped: "triathlon_summary_last.fit" -> "triathlon_summary_last-fitdump.txt"
+```
+
+### Build or Install
+
+#### Build
+
+```sh
+go build -o fitdump main.go
+```
+
+#### Install
+
+```sh
+go install .
+```
+
+#### Run the resulting Binary
+
+```sh
+fitdump triathlon_summary_last.fit
+
+# Output:
+# FIT dumped: "triathlon_summary_last.fit" -> "triathlon_summary_last-fitdump.txt"
 ```

cmd/fitdump/main.go

@@ -46,7 +46,7 @@ func textdump(path string) error {
 	if len(ext) < len(base) {
 		name = base[:len(base)-len(ext)]
 	}
-	name = name + ".txt"
+	name = name + "-fitdump.txt"
 
 	resultPath := filepath.Join(dir, name)
 	out, err := os.OpenFile(resultPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)

cmd/fitprint/README.md

@@ -10,7 +10,7 @@ A program to generate comprehensive human-readable `*.txt` file containing detai
 go run main.go DeveloperData.fit
 
 # Output:
-📄 "DeveloperData.fit" -> "DeveloperData.txt"
+📄 "DeveloperData.fit" -> "DeveloperData-fitprint.txt"
 ```
 
 ### Build or Install
@@ -33,7 +33,7 @@ go install .
 fitprint DeveloperData.fit
 
 # Output:
-📄 "DeveloperData.fit" -> "DeveloperData.txt"
+📄 "DeveloperData.fit" -> "DeveloperData-fitprint.txt"
 ```
 
 ## Sample Output

cmd/fitprint/printer/printer.go

@@ -56,7 +56,7 @@ func Print(path string) error {
 	if len(ext) < len(base) {
 		name = base[:len(base)-len(ext)]
 	}
-	name = name + ".txt"
+	name = name + "-fitprint.txt"
 
 	resultPath := filepath.Join(dir, name)
 	out, err := os.OpenFile(resultPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)